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/-- This set of tests is not Perl-compatible. It checks on special features
of PCRE's API, error diagnostics, and the compiled code of some patterns.
It also checks the non-Perl syntax the PCRE supports (Python, .NET,
Oniguruma). Finally, there are some tests where PCRE and Perl differ,
either because PCRE can't be compatible, or there is a possible Perl
bug.
NOTE: This is a non-UTF set of tests. When UTF support is needed, use
test 5, and if Unicode Property Support is needed, use test 7. --/
< forbid 8W
/(a)b|/I
Capturing subpattern count = 1
May match empty string
No options
No first char
No need char
/abc/I
Capturing subpattern count = 0
No options
First char = 'a'
Need char = 'c'
abc
0: abc
defabc
0: abc
\Aabc
0: abc
*** Failers
No match
\Adefabc
No match
ABC
No match
/^abc/I
Capturing subpattern count = 0
Options: anchored
No first char
No need char
abc
0: abc
\Aabc
0: abc
*** Failers
No match
defabc
No match
\Adefabc
No match
/a+bc/I
Capturing subpattern count = 0
No options
First char = 'a'
Need char = 'c'
/a*bc/I
Capturing subpattern count = 0
No options
No first char
Need char = 'c'
/a{3}bc/I
Capturing subpattern count = 0
No options
First char = 'a'
Need char = 'c'
/(abc|a+z)/I
Capturing subpattern count = 1
No options
First char = 'a'
No need char
/^abc$/I
Capturing subpattern count = 0
Options: anchored
No first char
No need char
abc
0: abc
*** Failers
No match
def\nabc
No match
/ab\idef/X
Failed: unrecognized character follows \ at offset 3
/(?X)ab\idef/X
Failed: unrecognized character follows \ at offset 7
/x{5,4}/
Failed: numbers out of order in {} quantifier at offset 5
/z{65536}/
Failed: number too big in {} quantifier at offset 7
/[abcd/
Failed: missing terminating ] for character class at offset 5
/(?X)[\B]/
Failed: invalid escape sequence in character class at offset 6
/(?X)[\R]/
Failed: invalid escape sequence in character class at offset 6
/(?X)[\X]/
Failed: invalid escape sequence in character class at offset 6
/[\B]/BZ
------------------------------------------------------------------
Bra
B
Ket
End
------------------------------------------------------------------
/[\R]/BZ
------------------------------------------------------------------
Bra
R
Ket
End
------------------------------------------------------------------
/[\X]/BZ
------------------------------------------------------------------
Bra
X
Ket
End
------------------------------------------------------------------
/[z-a]/
Failed: range out of order in character class at offset 3
/^*/
Failed: nothing to repeat at offset 1
/(abc/
Failed: missing ) at offset 4
/(?# abc/
Failed: missing ) after comment at offset 7
/(?z)abc/
Failed: unrecognized character after (? or (?- at offset 2
/.*b/I
Capturing subpattern count = 0
No options
First char at start or follows newline
Need char = 'b'
/.*?b/I
Capturing subpattern count = 0
No options
First char at start or follows newline
Need char = 'b'
/cat|dog|elephant/I
Capturing subpattern count = 0
No options
No first char
No need char
this sentence eventually mentions a cat
0: cat
this sentences rambles on and on for a while and then reaches elephant
0: elephant
/cat|dog|elephant/IS
Capturing subpattern count = 0
No options
No first char
No need char
Subject length lower bound = 3
Starting chars: c d e
this sentence eventually mentions a cat
0: cat
this sentences rambles on and on for a while and then reaches elephant
0: elephant
/cat|dog|elephant/IiS
Capturing subpattern count = 0
Options: caseless
No first char
No need char
Subject length lower bound = 3
Starting chars: C D E c d e
this sentence eventually mentions a CAT cat
0: CAT
this sentences rambles on and on for a while to elephant ElePhant
0: elephant
/a|[bcd]/IS
Capturing subpattern count = 0
No options
No first char
No need char
Subject length lower bound = 1
Starting chars: a b c d
/(a|[^\dZ])/IS
Capturing subpattern count = 1
No options
No first char
No need char
Subject length lower bound = 1
Starting chars: \x00 \x01 \x02 \x03 \x04 \x05 \x06 \x07 \x08 \x09 \x0a
\x0b \x0c \x0d \x0e \x0f \x10 \x11 \x12 \x13 \x14 \x15 \x16 \x17 \x18 \x19
\x1a \x1b \x1c \x1d \x1e \x1f \x20 ! " # $ % & ' ( ) * + , - . / : ; < = >
? @ A B C D E F G H I J K L M N O P Q R S T U V W X Y [ \ ] ^ _ ` a b c d
e f g h i j k l m n o p q r s t u v w x y z { | } ~ \x7f \x80 \x81 \x82 \x83
\x84 \x85 \x86 \x87 \x88 \x89 \x8a \x8b \x8c \x8d \x8e \x8f \x90 \x91 \x92
\x93 \x94 \x95 \x96 \x97 \x98 \x99 \x9a \x9b \x9c \x9d \x9e \x9f \xa0 \xa1
\xa2 \xa3 \xa4 \xa5 \xa6 \xa7 \xa8 \xa9 \xaa \xab \xac \xad \xae \xaf \xb0
\xb1 \xb2 \xb3 \xb4 \xb5 \xb6 \xb7 \xb8 \xb9 \xba \xbb \xbc \xbd \xbe \xbf
\xc0 \xc1 \xc2 \xc3 \xc4 \xc5 \xc6 \xc7 \xc8 \xc9 \xca \xcb \xcc \xcd \xce
\xcf \xd0 \xd1 \xd2 \xd3 \xd4 \xd5 \xd6 \xd7 \xd8 \xd9 \xda \xdb \xdc \xdd
\xde \xdf \xe0 \xe1 \xe2 \xe3 \xe4 \xe5 \xe6 \xe7 \xe8 \xe9 \xea \xeb \xec
\xed \xee \xef \xf0 \xf1 \xf2 \xf3 \xf4 \xf5 \xf6 \xf7 \xf8 \xf9 \xfa \xfb
\xfc \xfd \xfe \xff
/(a|b)*[\s]/IS
Capturing subpattern count = 1
No options
No first char
No need char
Subject length lower bound = 1
Starting chars: \x09 \x0a \x0b \x0c \x0d \x20 a b
/(ab\2)/
Failed: reference to non-existent subpattern at offset 6
/{4,5}abc/
Failed: nothing to repeat at offset 4
/(a)(b)(c)\2/I
Capturing subpattern count = 3
Max back reference = 2
No options
First char = 'a'
Need char = 'c'
abcb
0: abcb
1: a
2: b
3: c
\O0abcb
Matched, but too many substrings
\O3abcb
Matched, but too many substrings
0: abcb
\O6abcb
Matched, but too many substrings
0: abcb
1: a
\O9abcb
Matched, but too many substrings
0: abcb
1: a
2: b
\O12abcb
0: abcb
1: a
2: b
3: c
/(a)bc|(a)(b)\2/I
Capturing subpattern count = 3
Max back reference = 2
No options
First char = 'a'
No need char
abc
0: abc
1: a
\O0abc
Matched, but too many substrings
\O3abc
Matched, but too many substrings
0: abc
\O6abc
0: abc
1: a
aba
0: aba
1: <unset>
2: a
3: b
\O0aba
Matched, but too many substrings
\O3aba
Matched, but too many substrings
0: aba
\O6aba
Matched, but too many substrings
0: aba
1: <unset>
\O9aba
Matched, but too many substrings
0: aba
1: <unset>
2: a
\O12aba
0: aba
1: <unset>
2: a
3: b
/abc$/IE
Capturing subpattern count = 0
Options: dollar_endonly
First char = 'a'
Need char = 'c'
abc
0: abc
*** Failers
No match
abc\n
No match
abc\ndef
No match
/(a)(b)(c)(d)(e)\6/
Failed: reference to non-existent subpattern at offset 17
/the quick brown fox/I
Capturing subpattern count = 0
No options
First char = 't'
Need char = 'x'
the quick brown fox
0: the quick brown fox
this is a line with the quick brown fox
0: the quick brown fox
/the quick brown fox/IA
Capturing subpattern count = 0
Options: anchored
No first char
No need char
the quick brown fox
0: the quick brown fox
*** Failers
No match
this is a line with the quick brown fox
No match
/ab(?z)cd/
Failed: unrecognized character after (? or (?- at offset 4
/^abc|def/I
Capturing subpattern count = 0
No options
No first char
No need char
abcdef
0: abc
abcdef\B
0: def
/.*((abc)$|(def))/I
Capturing subpattern count = 3
No options
First char at start or follows newline
No need char
defabc
0: defabc
1: abc
2: abc
\Zdefabc
0: def
1: def
2: <unset>
3: def
/)/
Failed: unmatched parentheses at offset 0
/a[]b/
Failed: missing terminating ] for character class at offset 4
/[^aeiou ]{3,}/I
Capturing subpattern count = 0
No options
No first char
No need char
co-processors, and for
0: -pr
/<.*>/I
Capturing subpattern count = 0
No options
First char = '<'
Need char = '>'
abc<def>ghi<klm>nop
0: <def>ghi<klm>
/<.*?>/I
Capturing subpattern count = 0
No options
First char = '<'
Need char = '>'
abc<def>ghi<klm>nop
0: <def>
/<.*>/IU
Capturing subpattern count = 0
Options: ungreedy
First char = '<'
Need char = '>'
abc<def>ghi<klm>nop
0: <def>
/(?U)<.*>/I
Capturing subpattern count = 0
No options
First char = '<'
Need char = '>'
abc<def>ghi<klm>nop
0: <def>
/<.*?>/IU
Capturing subpattern count = 0
Options: ungreedy
First char = '<'
Need char = '>'
abc<def>ghi<klm>nop
0: <def>ghi<klm>
/={3,}/IU
Capturing subpattern count = 0
Options: ungreedy
First char = '='
Need char = '='
abc========def
0: ===
/(?U)={3,}?/I
Capturing subpattern count = 0
No options
First char = '='
Need char = '='
abc========def
0: ========
/(?<!bar|cattle)foo/I
Capturing subpattern count = 0
Max lookbehind = 6
No options
First char = 'f'
Need char = 'o'
foo
0: foo
catfoo
0: foo
*** Failers
No match
the barfoo
No match
and cattlefoo
No match
/(?<=a+)b/
Failed: lookbehind assertion is not fixed length at offset 6
/(?<=aaa|b{0,3})b/
Failed: lookbehind assertion is not fixed length at offset 14
/(?<!(foo)a\1)bar/
Failed: lookbehind assertion is not fixed length at offset 12
/(?i)abc/I
Capturing subpattern count = 0
No options
First char = 'a' (caseless)
Need char = 'c' (caseless)
/(a|(?m)a)/I
Capturing subpattern count = 1
No options
First char = 'a'
No need char
/(?i)^1234/I
Capturing subpattern count = 0
Options: anchored
No first char
No need char
/(^b|(?i)^d)/I
Capturing subpattern count = 1
Options: anchored
No first char
No need char
/(?s).*/I
Capturing subpattern count = 0
May match empty string
Options: anchored
No first char
No need char
/[abcd]/IS
Capturing subpattern count = 0
No options
No first char
No need char
Subject length lower bound = 1
Starting chars: a b c d
/(?i)[abcd]/IS
Capturing subpattern count = 0
No options
No first char
No need char
Subject length lower bound = 1
Starting chars: A B C D a b c d
/(?m)[xy]|(b|c)/IS
Capturing subpattern count = 1
No options
No first char
No need char
Subject length lower bound = 1
Starting chars: b c x y
/(^a|^b)/Im
Capturing subpattern count = 1
Options: multiline
First char at start or follows newline
No need char
/(?i)(^a|^b)/Im
Capturing subpattern count = 1
Options: multiline
First char at start or follows newline
No need char
/(a)(?(1)a|b|c)/
Failed: conditional group contains more than two branches at offset 13
/(?(?=a)a|b|c)/
Failed: conditional group contains more than two branches at offset 12
/(?(1a)/
Failed: malformed number or name after (?( at offset 4
/(?(1a))/
Failed: malformed number or name after (?( at offset 4
/(?(?i))/
Failed: assertion expected after (?( or (?(?C) at offset 3
/(?(abc))/
Failed: reference to non-existent subpattern at offset 7
/(?(?<ab))/
Failed: assertion expected after (?( or (?(?C) at offset 3
/((?s)blah)\s+\1/I
Capturing subpattern count = 1
Max back reference = 1
No options
First char = 'b'
Need char = 'h'
/((?i)blah)\s+\1/I
Capturing subpattern count = 1
Max back reference = 1
No options
First char = 'b' (caseless)
Need char = 'h' (caseless)
/((?i)b)/IDZS
------------------------------------------------------------------
Bra
CBra 1
/i b
Ket
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 1
No options
First char = 'b' (caseless)
No need char
Subject length lower bound = 1
No starting char list
/(a*b|(?i:c*(?-i)d))/IS
Capturing subpattern count = 1
No options
No first char
No need char
Subject length lower bound = 1
Starting chars: C a b c d
/a$/I
Capturing subpattern count = 0
No options
First char = 'a'
No need char
a
0: a
a\n
0: a
*** Failers
No match
\Za
No match
\Za\n
No match
/a$/Im
Capturing subpattern count = 0
Options: multiline
First char = 'a'
No need char
a
0: a
a\n
0: a
\Za\n
0: a
*** Failers
No match
\Za
No match
/\Aabc/Im
Capturing subpattern count = 0
Max lookbehind = 1
Options: anchored multiline
No first char
No need char
/^abc/Im
Capturing subpattern count = 0
Options: multiline
First char at start or follows newline
Need char = 'c'
/^((a+)(?U)([ab]+)(?-U)([bc]+)(\w*))/I
Capturing subpattern count = 5
Options: anchored
No first char
No need char
aaaaabbbbbcccccdef
0: aaaaabbbbbcccccdef
1: aaaaabbbbbcccccdef
2: aaaaa
3: b
4: bbbbccccc
5: def
/(?<=foo)[ab]/IS
Capturing subpattern count = 0
Max lookbehind = 3
No options
No first char
No need char
Subject length lower bound = 1
Starting chars: a b
/(?<!foo)(alpha|omega)/IS
Capturing subpattern count = 1
Max lookbehind = 3
No options
No first char
Need char = 'a'
Subject length lower bound = 5
Starting chars: a o
/(?!alphabet)[ab]/IS
Capturing subpattern count = 0
No options
No first char
No need char
Subject length lower bound = 1
Starting chars: a b
/(?<=foo\n)^bar/Im
Capturing subpattern count = 0
Max lookbehind = 4
Contains explicit CR or LF match
Options: multiline
No first char
Need char = 'r'
foo\nbarbar
0: bar
***Failers
No match
rhubarb
No match
barbell
No match
abc\nbarton
No match
/^(?<=foo\n)bar/Im
Capturing subpattern count = 0
Max lookbehind = 4
Contains explicit CR or LF match
Options: multiline
First char at start or follows newline
Need char = 'r'
foo\nbarbar
0: bar
***Failers
No match
rhubarb
No match
barbell
No match
abc\nbarton
No match
/(?>^abc)/Im
Capturing subpattern count = 0
Options: multiline
First char at start or follows newline
Need char = 'c'
abc
0: abc
def\nabc
0: abc
*** Failers
No match
defabc
No match
/(?<=ab(c+)d)ef/
Failed: lookbehind assertion is not fixed length at offset 11
/(?<=ab(?<=c+)d)ef/
Failed: lookbehind assertion is not fixed length at offset 12
/(?<=ab(c|de)f)g/
Failed: lookbehind assertion is not fixed length at offset 13
/The next three are in testinput2 because they have variable length branches/
/(?<=bullock|donkey)-cart/I
Capturing subpattern count = 0
Max lookbehind = 7
No options
First char = '-'
Need char = 't'
the bullock-cart
0: -cart
a donkey-cart race
0: -cart
*** Failers
No match
cart
No match
horse-and-cart
No match
/(?<=ab(?i)x|y|z)/I
Capturing subpattern count = 0
Max lookbehind = 3
May match empty string
No options
No first char
No need char
/(?>.*)(?<=(abcd)|(xyz))/I
Capturing subpattern count = 2
Max lookbehind = 4
May match empty string
No options
No first char
No need char
alphabetabcd
0: alphabetabcd
1: abcd
endingxyz
0: endingxyz
1: <unset>
2: xyz
/(?<=ab(?i)x(?-i)y|(?i)z|b)ZZ/I
Capturing subpattern count = 0
Max lookbehind = 4
No options
First char = 'Z'
Need char = 'Z'
abxyZZ
0: ZZ
abXyZZ
0: ZZ
ZZZ
0: ZZ
zZZ
0: ZZ
bZZ
0: ZZ
BZZ
0: ZZ
*** Failers
No match
ZZ
No match
abXYZZ
No match
zzz
No match
bzz
No match
/(?<!(foo)a)bar/I
Capturing subpattern count = 1
Max lookbehind = 4
No options
First char = 'b'
Need char = 'r'
bar
0: bar
foobbar
0: bar
*** Failers
No match
fooabar
No match
/This one is here because Perl behaves differently; see also the following/I
Capturing subpattern count = 0
No options
First char = 'T'
Need char = 'g'
/^(a\1?){4}$/I
Capturing subpattern count = 1
Max back reference = 1
Options: anchored
No first char
No need char
aaaa
No match
aaaaaa
No match
/Perl does not fail these two for the final subjects. Neither did PCRE until/
/release 8.01. The problem is in backtracking into a subpattern that contains/
No match
/a recursive reference to itself. PCRE has now made these into atomic patterns./
No match
/^(xa|=?\1a){2}$/
xa=xaa
0: xa=xaa
1: =xaa
** Failers
No match
xa=xaaa
No match
/^(xa|=?\1a)+$/
xa=xaa
0: xa=xaa
1: =xaa
** Failers
No match
xa=xaaa
No match
/These are syntax tests from Perl 5.005/I
Capturing subpattern count = 0
No options
First char = 'T'
Need char = '5'
/a[b-a]/
Failed: range out of order in character class at offset 4
/a[]b/
Failed: missing terminating ] for character class at offset 4
/a[/
Failed: missing terminating ] for character class at offset 2
/*a/
Failed: nothing to repeat at offset 0
/(*)b/
Failed: nothing to repeat at offset 1
/abc)/
Failed: unmatched parentheses at offset 3
/(abc/
Failed: missing ) at offset 4
/a**/
Failed: nothing to repeat at offset 2
/)(/
Failed: unmatched parentheses at offset 0
/\1/
Failed: reference to non-existent subpattern at offset 2
/\2/
Failed: reference to non-existent subpattern at offset 2
/(a)|\2/
Failed: reference to non-existent subpattern at offset 6
/a[b-a]/Ii
Failed: range out of order in character class at offset 4
/a[]b/Ii
Failed: missing terminating ] for character class at offset 4
/a[/Ii
Failed: missing terminating ] for character class at offset 2
/*a/Ii
Failed: nothing to repeat at offset 0
/(*)b/Ii
Failed: nothing to repeat at offset 1
/abc)/Ii
Failed: unmatched parentheses at offset 3
/(abc/Ii
Failed: missing ) at offset 4
/a**/Ii
Failed: nothing to repeat at offset 2
/)(/Ii
Failed: unmatched parentheses at offset 0
/:(?:/
Failed: missing ) at offset 4
/(?<%)b/
Failed: unrecognized character after (?< at offset 3
/a(?{)b/
Failed: unrecognized character after (? or (?- at offset 3
/a(?{{})b/
Failed: unrecognized character after (? or (?- at offset 3
/a(?{}})b/
Failed: unrecognized character after (? or (?- at offset 3
/a(?{"{"})b/
Failed: unrecognized character after (? or (?- at offset 3
/a(?{"{"}})b/
Failed: unrecognized character after (? or (?- at offset 3
/(?(1?)a|b)/
Failed: malformed number or name after (?( at offset 4
/[a[:xyz:/
Failed: missing terminating ] for character class at offset 8
/(?<=x+)y/
Failed: lookbehind assertion is not fixed length at offset 6
/a{37,17}/
Failed: numbers out of order in {} quantifier at offset 7
/abc/\
Failed: \ at end of pattern at offset 4
/abc/\i
Failed: \ at end of pattern at offset 4
/(a)bc(d)/I
Capturing subpattern count = 2
No options
First char = 'a'
Need char = 'd'
abcd
0: abcd
1: a
2: d
abcd\C2
0: abcd
1: a
2: d
2C d (1)
abcd\C5
0: abcd
1: a
2: d
copy substring 5 failed -7
/(.{20})/I
Capturing subpattern count = 1
No options
No first char
No need char
abcdefghijklmnopqrstuvwxyz
0: abcdefghijklmnopqrst
1: abcdefghijklmnopqrst
abcdefghijklmnopqrstuvwxyz\C1
0: abcdefghijklmnopqrst
1: abcdefghijklmnopqrst
1C abcdefghijklmnopqrst (20)
abcdefghijklmnopqrstuvwxyz\G1
0: abcdefghijklmnopqrst
1: abcdefghijklmnopqrst
1G abcdefghijklmnopqrst (20)
/(.{15})/I
Capturing subpattern count = 1
No options
No first char
No need char
abcdefghijklmnopqrstuvwxyz
0: abcdefghijklmno
1: abcdefghijklmno
abcdefghijklmnopqrstuvwxyz\C1\G1
0: abcdefghijklmno
1: abcdefghijklmno
1C abcdefghijklmno (15)
1G abcdefghijklmno (15)
/(.{16})/I
Capturing subpattern count = 1
No options
No first char
No need char
abcdefghijklmnopqrstuvwxyz
0: abcdefghijklmnop
1: abcdefghijklmnop
abcdefghijklmnopqrstuvwxyz\C1\G1\L
0: abcdefghijklmnop
1: abcdefghijklmnop
1C abcdefghijklmnop (16)
1G abcdefghijklmnop (16)
0L abcdefghijklmnop
1L abcdefghijklmnop
/^(a|(bc))de(f)/I
Capturing subpattern count = 3
Options: anchored
No first char
No need char
adef\G1\G2\G3\G4\L
0: adef
1: a
2: <unset>
3: f
1G a (1)
2G (0)
3G f (1)
get substring 4 failed -7
0L adef
1L a
2L
3L f
bcdef\G1\G2\G3\G4\L
0: bcdef
1: bc
2: bc
3: f
1G bc (2)
2G bc (2)
3G f (1)
get substring 4 failed -7
0L bcdef
1L bc
2L bc
3L f
adefghijk\C0
0: adef
1: a
2: <unset>
3: f
0C adef (4)
/^abc\00def/I
Capturing subpattern count = 0
Options: anchored
No first char
No need char
abc\00def\L\C0
0: abc\x00def
0C abc\x00def (7)
0L abc
/word ((?:[a-zA-Z0-9]+ )((?:[a-zA-Z0-9]+ )((?:[a-zA-Z0-9]+ )((?:[a-zA-Z0-9]+
)((?:[a-zA-Z0-9]+ )((?:[a-zA-Z0-9]+ )((?:[a-zA-Z0-9]+ )((?:[a-zA-Z0-9]+
)?)?)?)?)?)?)?)?)?otherword/I
Capturing subpattern count = 8
Contains explicit CR or LF match
No options
First char = 'w'
Need char = 'd'
/.*X/IDZ
------------------------------------------------------------------
Bra
Any*
X
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
No options
First char at start or follows newline
Need char = 'X'
/.*X/IDZs
------------------------------------------------------------------
Bra
AllAny*
X
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
Options: anchored dotall
No first char
Need char = 'X'
/(.*X|^B)/IDZ
------------------------------------------------------------------
Bra
CBra 1
Any*
X
Alt
^
B
Ket
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 1
No options
First char at start or follows newline
No need char
/(.*X|^B)/IDZs
------------------------------------------------------------------
Bra
CBra 1
AllAny*
X
Alt
^
B
Ket
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 1
Options: anchored dotall
No first char
No need char
/(?s)(.*X|^B)/IDZ
------------------------------------------------------------------
Bra
CBra 1
AllAny*
X
Alt
^
B
Ket
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 1
Options: anchored
No first char
No need char
/(?s:.*X|^B)/IDZ
------------------------------------------------------------------
Bra
Bra
AllAny*
X
Alt
^
B
Ket
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
Options: anchored
No first char
No need char
/\Biss\B/I+
Capturing subpattern count = 0
Max lookbehind = 1
No options
First char = 'i'
Need char = 's'
Mississippi
0: iss
0+ issippi
/iss/IG+
Capturing subpattern count = 0
No options
First char = 'i'
Need char = 's'
Mississippi
0: iss
0+ issippi
0: iss
0+ ippi
/\Biss\B/IG+
Capturing subpattern count = 0
Max lookbehind = 1
No options
First char = 'i'
Need char = 's'
Mississippi
0: iss
0+ issippi
/\Biss\B/Ig+
Capturing subpattern count = 0
Max lookbehind = 1
No options
First char = 'i'
Need char = 's'
Mississippi
0: iss
0+ issippi
0: iss
0+ ippi
*** Failers
No match
Mississippi\A
No match
/(?<=[Ms])iss/Ig+
Capturing subpattern count = 0
Max lookbehind = 1
No options
First char = 'i'
Need char = 's'
Mississippi
0: iss
0+ issippi
0: iss
0+ ippi
/(?<=[Ms])iss/IG+
Capturing subpattern count = 0
Max lookbehind = 1
No options
First char = 'i'
Need char = 's'
Mississippi
0: iss
0+ issippi
/^iss/Ig+
Capturing subpattern count = 0
Options: anchored
No first char
No need char
ississippi
0: iss
0+ issippi
/.*iss/Ig+
Capturing subpattern count = 0
No options
First char at start or follows newline
Need char = 's'
abciss\nxyzisspqr
0: abciss
0+ \x0axyzisspqr
0: xyziss
0+ pqr
/.i./I+g
Capturing subpattern count = 0
No options
No first char
Need char = 'i'
Mississippi
0: Mis
0+ sissippi
0: sis
0+ sippi
0: sip
0+ pi
Mississippi\A
0: Mis
0+ sissippi
0: sis
0+ sippi
0: sip
0+ pi
Missouri river
0: Mis
0+ souri river
0: ri
0+ river
0: riv
0+ er
Missouri river\A
0: Mis
0+ souri river
/^.is/I+g
Capturing subpattern count = 0
Options: anchored
No first char
No need char
Mississippi
0: Mis
0+ sissippi
/^ab\n/Ig+
Capturing subpattern count = 0
Contains explicit CR or LF match
Options: anchored
No first char
No need char
ab\nab\ncd
0: ab\x0a
0+ ab\x0acd
/^ab\n/Img+
Capturing subpattern count = 0
Contains explicit CR or LF match
Options: multiline
First char at start or follows newline
Need char = \x0a
ab\nab\ncd
0: ab\x0a
0+ ab\x0acd
0: ab\x0a
0+ cd
/abc/I
Capturing subpattern count = 0
No options
First char = 'a'
Need char = 'c'
/abc|bac/I
Capturing subpattern count = 0
No options
No first char
Need char = 'c'
/(abc|bac)/I
Capturing subpattern count = 1
No options
No first char
Need char = 'c'
/(abc|(c|dc))/I
Capturing subpattern count = 2
No options
No first char
Need char = 'c'
/(abc|(d|de)c)/I
Capturing subpattern count = 2
No options
No first char
Need char = 'c'
/a*/I
Capturing subpattern count = 0
May match empty string
No options
No first char
No need char
/a+/I
Capturing subpattern count = 0
No options
First char = 'a'
No need char
/(baa|a+)/I
Capturing subpattern count = 1
No options
No first char
Need char = 'a'
/a{0,3}/I
Capturing subpattern count = 0
May match empty string
No options
No first char
No need char
/baa{3,}/I
Capturing subpattern count = 0
No options
First char = 'b'
Need char = 'a'
/"([^\\"]+|\\.)*"/I
Capturing subpattern count = 1
No options
First char = '"'
Need char = '"'
/(abc|ab[cd])/I
Capturing subpattern count = 1
No options
First char = 'a'
No need char
/(a|.)/I
Capturing subpattern count = 1
No options
No first char
No need char
/a|ba|\w/I
Capturing subpattern count = 0
No options
No first char
No need char
/abc(?=pqr)/I
Capturing subpattern count = 0
No options
First char = 'a'
Need char = 'r'
/...(?<=abc)/I
Capturing subpattern count = 0
Max lookbehind = 3
No options
No first char
No need char
/abc(?!pqr)/I
Capturing subpattern count = 0
No options
First char = 'a'
Need char = 'c'
/ab./I
Capturing subpattern count = 0
No options
First char = 'a'
Need char = 'b'
/ab[xyz]/I
Capturing subpattern count = 0
No options
First char = 'a'
Need char = 'b'
/abc*/I
Capturing subpattern count = 0
No options
First char = 'a'
Need char = 'b'
/ab.c*/I
Capturing subpattern count = 0
No options
First char = 'a'
Need char = 'b'
/a.c*/I
Capturing subpattern count = 0
No options
First char = 'a'
No need char
/.c*/I
Capturing subpattern count = 0
No options
No first char
No need char
/ac*/I
Capturing subpattern count = 0
No options
First char = 'a'
No need char
/(a.c*|b.c*)/I
Capturing subpattern count = 1
No options
No first char
No need char
/a.c*|aba/I
Capturing subpattern count = 0
No options
First char = 'a'
No need char
/.+a/I
Capturing subpattern count = 0
No options
No first char
Need char = 'a'
/(?=abcda)a.*/I
Capturing subpattern count = 0
No options
First char = 'a'
Need char = 'a'
/(?=a)a.*/I
Capturing subpattern count = 0
No options
First char = 'a'
No need char
/a(b)*/I
Capturing subpattern count = 1
No options
First char = 'a'
No need char
/a\d*/I
Capturing subpattern count = 0
No options
First char = 'a'
No need char
/ab\d*/I
Capturing subpattern count = 0
No options
First char = 'a'
Need char = 'b'
/a(\d)*/I
Capturing subpattern count = 1
No options
First char = 'a'
No need char
/abcde{0,0}/I
Capturing subpattern count = 0
No options
First char = 'a'
Need char = 'd'
/ab\d+/I
Capturing subpattern count = 0
No options
First char = 'a'
Need char = 'b'
/a(?(1)b)(.)/I
Capturing subpattern count = 1
Max back reference = 1
No options
First char = 'a'
No need char
/a(?(1)bag|big)(.)/I
Capturing subpattern count = 1
Max back reference = 1
No options
First char = 'a'
Need char = 'g'
/a(?(1)bag|big)*(.)/I
Capturing subpattern count = 1
Max back reference = 1
No options
First char = 'a'
No need char
/a(?(1)bag|big)+(.)/I
Capturing subpattern count = 1
Max back reference = 1
No options
First char = 'a'
Need char = 'g'
/a(?(1)b..|b..)(.)/I
Capturing subpattern count = 1
Max back reference = 1
No options
First char = 'a'
Need char = 'b'
/ab\d{0}e/I
Capturing subpattern count = 0
No options
First char = 'a'
Need char = 'e'
/a?b?/I
Capturing subpattern count = 0
May match empty string
No options
No first char
No need char
a
0: a
b
0: b
ab
0: ab
\
0:
*** Failers
0:
\N
No match
/|-/I
Capturing subpattern count = 0
May match empty string
No options
No first char
No need char
abcd
0:
-abc
0:
\Nab-c
0: -
*** Failers
0:
\Nabc
No match
/^.?abcd/IS
Capturing subpattern count = 0
Options: anchored
No first char
Need char = 'd'
Subject length lower bound = 4
No starting char list
/\( # ( at start
(?: # Non-capturing bracket
(?>[^()]+) # Either a sequence of non-brackets (no backtracking)
| # Or
(?R) # Recurse - i.e. nested bracketed string
)* # Zero or more contents
\) # Closing )
/Ix
Capturing subpattern count = 0
Options: extended
First char = '('
Need char = ')'
(abcd)
0: (abcd)
(abcd)xyz
0: (abcd)
xyz(abcd)
0: (abcd)
(ab(xy)cd)pqr
0: (ab(xy)cd)
(ab(xycd)pqr
0: (xycd)
() abc ()
0: ()
12(abcde(fsh)xyz(foo(bar))lmno)89
0: (abcde(fsh)xyz(foo(bar))lmno)
*** Failers
No match
abcd
No match
abcd)
No match
(abcd
No match
/\( ( (?>[^()]+) | (?R) )* \) /Ixg
Capturing subpattern count = 1
Options: extended
First char = '('
Need char = ')'
(ab(xy)cd)pqr
0: (ab(xy)cd)
1: cd
1(abcd)(x(y)z)pqr
0: (abcd)
1: abcd
0: (x(y)z)
1: z
/\( (?: (?>[^()]+) | (?R) ) \) /Ix
Capturing subpattern count = 0
Options: extended
First char = '('
Need char = ')'
(abcd)
0: (abcd)
(ab(xy)cd)
0: (xy)
(a(b(c)d)e)
0: (c)
((ab))
0: ((ab))
*** Failers
No match
()
No match
/\( (?: (?>[^()]+) | (?R) )? \) /Ix
Capturing subpattern count = 0
Options: extended
First char = '('
Need char = ')'
()
0: ()
12(abcde(fsh)xyz(foo(bar))lmno)89
0: (fsh)
/\( ( (?>[^()]+) | (?R) )* \) /Ix
Capturing subpattern count = 1
Options: extended
First char = '('
Need char = ')'
(ab(xy)cd)
0: (ab(xy)cd)
1: cd
/\( ( ( (?>[^()]+) | (?R) )* ) \) /Ix
Capturing subpattern count = 2
Options: extended
First char = '('
Need char = ')'
(ab(xy)cd)
0: (ab(xy)cd)
1: ab(xy)cd
2: cd
/\( (123)? ( ( (?>[^()]+) | (?R) )* ) \) /Ix
Capturing subpattern count = 3
Options: extended
First char = '('
Need char = ')'
(ab(xy)cd)
0: (ab(xy)cd)
1: <unset>
2: ab(xy)cd
3: cd
(123ab(xy)cd)
0: (123ab(xy)cd)
1: 123
2: ab(xy)cd
3: cd
/\( ( (123)? ( (?>[^()]+) | (?R) )* ) \) /Ix
Capturing subpattern count = 3
Options: extended
First char = '('
Need char = ')'
(ab(xy)cd)
0: (ab(xy)cd)
1: ab(xy)cd
2: <unset>
3: cd
(123ab(xy)cd)
0: (123ab(xy)cd)
1: 123ab(xy)cd
2: 123
3: cd
/\( (((((((((( ( (?>[^()]+) | (?R) )* )))))))))) \) /Ix
Capturing subpattern count = 11
Options: extended
First char = '('
Need char = ')'
(ab(xy)cd)
0: (ab(xy)cd)
1: ab(xy)cd
2: ab(xy)cd
3: ab(xy)cd
4: ab(xy)cd
5: ab(xy)cd
6: ab(xy)cd
7: ab(xy)cd
8: ab(xy)cd
9: ab(xy)cd
10: ab(xy)cd
11: cd
/\( ( ( (?>[^()<>]+) | ((?>[^()]+)) | (?R) )* ) \) /Ix
Capturing subpattern count = 3
Options: extended
First char = '('
Need char = ')'
(abcd(xyz<p>qrs)123)
0: (abcd(xyz<p>qrs)123)
1: abcd(xyz<p>qrs)123
2: 123
/\( ( ( (?>[^()]+) | ((?R)) )* ) \) /Ix
Capturing subpattern count = 3
Options: extended
First char = '('
Need char = ')'
(ab(cd)ef)
0: (ab(cd)ef)
1: ab(cd)ef
2: ef
3: (cd)
(ab(cd(ef)gh)ij)
0: (ab(cd(ef)gh)ij)
1: ab(cd(ef)gh)ij
2: ij
3: (cd(ef)gh)
/^[[:alnum:]]/DZ
------------------------------------------------------------------
Bra
^
[0-9A-Za-z]
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
Options: anchored
No first char
No need char
/^[[:^alnum:]]/DZ
------------------------------------------------------------------
Bra
^
[\x00-/:-@[-`{-\xff] (neg)
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
Options: anchored
No first char
No need char
/^[[:alpha:]]/DZ
------------------------------------------------------------------
Bra
^
[A-Za-z]
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
Options: anchored
No first char
No need char
/^[[:^alpha:]]/DZ
------------------------------------------------------------------
Bra
^
[\x00-@[-`{-\xff] (neg)
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
Options: anchored
No first char
No need char
/[_[:alpha:]]/IS
Capturing subpattern count = 0
No options
No first char
No need char
Subject length lower bound = 1
Starting chars: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
_ a b c d e f g h i j k l m n o p q r s t u v w x y z
/^[[:ascii:]]/DZ
------------------------------------------------------------------
Bra
^
[\x00-\x7f]
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
Options: anchored
No first char
No need char
/^[[:^ascii:]]/DZ
------------------------------------------------------------------
Bra
^
[\x80-\xff] (neg)
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
Options: anchored
No first char
No need char
/^[[:blank:]]/DZ
------------------------------------------------------------------
Bra
^
[\x09 ]
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
Options: anchored
No first char
No need char
/^[[:^blank:]]/DZ
------------------------------------------------------------------
Bra
^
[\x00-\x08\x0a-\x1f!-\xff] (neg)
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
Options: anchored
No first char
No need char
/[\n\x0b\x0c\x0d[:blank:]]/IS
Capturing subpattern count = 0
Contains explicit CR or LF match
No options
No first char
No need char
Subject length lower bound = 1
Starting chars: \x09 \x0a \x0b \x0c \x0d \x20
/^[[:cntrl:]]/DZ
------------------------------------------------------------------
Bra
^
[\x00-\x1f\x7f]
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
Options: anchored
No first char
No need char
/^[[:digit:]]/DZ
------------------------------------------------------------------
Bra
^
[0-9]
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
Options: anchored
No first char
No need char
/^[[:graph:]]/DZ
------------------------------------------------------------------
Bra
^
[!-~]
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
Options: anchored
No first char
No need char
/^[[:lower:]]/DZ
------------------------------------------------------------------
Bra
^
[a-z]
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
Options: anchored
No first char
No need char
/^[[:print:]]/DZ
------------------------------------------------------------------
Bra
^
[ -~]
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
Options: anchored
No first char
No need char
/^[[:punct:]]/DZ
------------------------------------------------------------------
Bra
^
[!-/:-@[-`{-~]
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
Options: anchored
No first char
No need char
/^[[:space:]]/DZ
------------------------------------------------------------------
Bra
^
[\x09-\x0d ]
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
Options: anchored
No first char
No need char
/^[[:upper:]]/DZ
------------------------------------------------------------------
Bra
^
[A-Z]
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
Options: anchored
No first char
No need char
/^[[:xdigit:]]/DZ
------------------------------------------------------------------
Bra
^
[0-9A-Fa-f]
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
Options: anchored
No first char
No need char
/^[[:word:]]/DZ
------------------------------------------------------------------
Bra
^
[0-9A-Z_a-z]
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
Options: anchored
No first char
No need char
/^[[:^cntrl:]]/DZ
------------------------------------------------------------------
Bra
^
[ -~\x80-\xff] (neg)
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
Options: anchored
No first char
No need char
/^[12[:^digit:]]/DZ
------------------------------------------------------------------
Bra
^
[\x00-/12:-\xff] (neg)
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
Options: anchored
No first char
No need char
/^[[:^blank:]]/DZ
------------------------------------------------------------------
Bra
^
[\x00-\x08\x0a-\x1f!-\xff] (neg)
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
Options: anchored
No first char
No need char
/[01[:alpha:]%]/DZ
------------------------------------------------------------------
Bra
[%01A-Za-z]
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
No options
No first char
No need char
/[[.ch.]]/I
Failed: POSIX collating elements are not supported at offset 1
/[[=ch=]]/I
Failed: POSIX collating elements are not supported at offset 1
/[[:rhubarb:]]/I
Failed: unknown POSIX class name at offset 3
/[[:upper:]]/Ii
Capturing subpattern count = 0
Options: caseless
No first char
No need char
A
0: A
a
0: a
/[[:lower:]]/Ii
Capturing subpattern count = 0
Options: caseless
No first char
No need char
A
0: A
a
0: a
/((?-i)[[:lower:]])[[:lower:]]/Ii
Capturing subpattern count = 1
Options: caseless
No first char
No need char
ab
0: ab
1: a
aB
0: aB
1: a
*** Failers
0: ai
1: a
Ab
No match
AB
No match
/[\200-\110]/I
Failed: range out of order in character class at offset 9
/^(?(0)f|b)oo/I
Failed: invalid condition (?(0) at offset 6
/This one's here because of the large output vector needed/I
Capturing subpattern count = 0
No options
First char = 'T'
Need char = 'd'
/(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\w+)\s+(\270)/I
Capturing subpattern count = 271
Max back reference = 270
No options
No first char
No need char
\O900 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 ABC ABC
0: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 ABC ABC
1: 1
2: 2
3: 3
4: 4
5: 5
6: 6
7: 7
8: 8
9: 9
10: 10
11: 11
12: 12
13: 13
14: 14
15: 15
16: 16
17: 17
18: 18
19: 19
20: 20
21: 21
22: 22
23: 23
24: 24
25: 25
26: 26
27: 27
28: 28
29: 29
30: 30
31: 31
32: 32
33: 33
34: 34
35: 35
36: 36
37: 37
38: 38
39: 39
40: 40
41: 41
42: 42
43: 43
44: 44
45: 45
46: 46
47: 47
48: 48
49: 49
50: 50
51: 51
52: 52
53: 53
54: 54
55: 55
56: 56
57: 57
58: 58
59: 59
60: 60
61: 61
62: 62
63: 63
64: 64
65: 65
66: 66
67: 67
68: 68
69: 69
70: 70
71: 71
72: 72
73: 73
74: 74
75: 75
76: 76
77: 77
78: 78
79: 79
80: 80
81: 81
82: 82
83: 83
84: 84
85: 85
86: 86
87: 87
88: 88
89: 89
90: 90
91: 91
92: 92
93: 93
94: 94
95: 95
96: 96
97: 97
98: 98
99: 99
100: 100
101: 101
102: 102
103: 103
104: 104
105: 105
106: 106
107: 107
108: 108
109: 109
110: 110
111: 111
112: 112
113: 113
114: 114
115: 115
116: 116
117: 117
118: 118
119: 119
120: 120
121: 121
122: 122
123: 123
124: 124
125: 125
126: 126
127: 127
128: 128
129: 129
130: 130
131: 131
132: 132
133: 133
134: 134
135: 135
136: 136
137: 137
138: 138
139: 139
140: 140
141: 141
142: 142
143: 143
144: 144
145: 145
146: 146
147: 147
148: 148
149: 149
150: 150
151: 151
152: 152
153: 153
154: 154
155: 155
156: 156
157: 157
158: 158
159: 159
160: 160
161: 161
162: 162
163: 163
164: 164
165: 165
166: 166
167: 167
168: 168
169: 169
170: 170
171: 171
172: 172
173: 173
174: 174
175: 175
176: 176
177: 177
178: 178
179: 179
180: 180
181: 181
182: 182
183: 183
184: 184
185: 185
186: 186
187: 187
188: 188
189: 189
190: 190
191: 191
192: 192
193: 193
194: 194
195: 195
196: 196
197: 197
198: 198
199: 199
200: 200
201: 201
202: 202
203: 203
204: 204
205: 205
206: 206
207: 207
208: 208
209: 209
210: 210
211: 211
212: 212
213: 213
214: 214
215: 215
216: 216
217: 217
218: 218
219: 219
220: 220
221: 221
222: 222
223: 223
224: 224
225: 225
226: 226
227: 227
228: 228
229: 229
230: 230
231: 231
232: 232
233: 233
234: 234
235: 235
236: 236
237: 237
238: 238
239: 239
240: 240
241: 241
242: 242
243: 243
244: 244
245: 245
246: 246
247: 247
248: 248
249: 249
250: 250
251: 251
252: 252
253: 253
254: 254
255: 255
256: 256
257: 257
258: 258
259: 259
260: 260
261: 261
262: 262
263: 263
264: 264
265: 265
266: 266
267: 267
268: 268
269: 269
270: ABC
271: ABC
/This one's here because Perl does this differently and PCRE can't at present/I
Capturing subpattern count = 0
No options
First char = 'T'
Need char = 't'
/(main(O)?)+/I
Capturing subpattern count = 2
No options
First char = 'm'
Need char = 'n'
mainmain
0: mainmain
1: main
mainOmain
0: mainOmain
1: main
2: O
/These are all cases where Perl does it differently (nested captures)/I
Capturing subpattern count = 1
No options
First char = 'T'
Need char = 's'
/^(a(b)?)+$/I
Capturing subpattern count = 2
Options: anchored
No first char
No need char
aba
0: aba
1: a
2: b
/^(aa(bb)?)+$/I
Capturing subpattern count = 2
Options: anchored
No first char
No need char
aabbaa
0: aabbaa
1: aa
2: bb
/^(aa|aa(bb))+$/I
Capturing subpattern count = 2
Options: anchored
No first char
No need char
aabbaa
0: aabbaa
1: aa
2: bb
/^(aa(bb)??)+$/I
Capturing subpattern count = 2
Options: anchored
No first char
No need char
aabbaa
0: aabbaa
1: aa
2: bb
/^(?:aa(bb)?)+$/I
Capturing subpattern count = 1
Options: anchored
No first char
No need char
aabbaa
0: aabbaa
1: bb
/^(aa(b(b))?)+$/I
Capturing subpattern count = 3
Options: anchored
No first char
No need char
aabbaa
0: aabbaa
1: aa
2: bb
3: b
/^(?:aa(b(b))?)+$/I
Capturing subpattern count = 2
Options: anchored
No first char
No need char
aabbaa
0: aabbaa
1: bb
2: b
/^(?:aa(b(?:b))?)+$/I
Capturing subpattern count = 1
Options: anchored
No first char
No need char
aabbaa
0: aabbaa
1: bb
/^(?:aa(bb(?:b))?)+$/I
Capturing subpattern count = 1
Options: anchored
No first char
No need char
aabbbaa
0: aabbbaa
1: bbb
/^(?:aa(b(?:bb))?)+$/I
Capturing subpattern count = 1
Options: anchored
No first char
No need char
aabbbaa
0: aabbbaa
1: bbb
/^(?:aa(?:b(b))?)+$/I
Capturing subpattern count = 1
Options: anchored
No first char
No need char
aabbaa
0: aabbaa
1: b
/^(?:aa(?:b(bb))?)+$/I
Capturing subpattern count = 1
Options: anchored
No first char
No need char
aabbbaa
0: aabbbaa
1: bb
/^(aa(b(bb))?)+$/I
Capturing subpattern count = 3
Options: anchored
No first char
No need char
aabbbaa
0: aabbbaa
1: aa
2: bbb
3: bb
/^(aa(bb(bb))?)+$/I
Capturing subpattern count = 3
Options: anchored
No first char
No need char
aabbbbaa
0: aabbbbaa
1: aa
2: bbbb
3: bb
/--------------------------------------------------------------------/I
Capturing subpattern count = 0
No options
First char = '-'
Need char = '-'
/#/IxDZ
------------------------------------------------------------------
Bra
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
May match empty string
Options: extended
No first char
No need char
/a#/IxDZ
------------------------------------------------------------------
Bra
a
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
Options: extended
First char = 'a'
No need char
/[\s]/DZ
------------------------------------------------------------------
Bra
[\x09-\x0d ]
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
No options
No first char
No need char
/[\S]/DZ
------------------------------------------------------------------
Bra
[\x00-\x08\x0e-\x1f!-\xff] (neg)
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
No options
No first char
No need char
/a(?i)b/DZ
------------------------------------------------------------------
Bra
a
/i b
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
No options
First char = 'a'
Need char = 'b' (caseless)
ab
0: ab
aB
0: aB
*** Failers
No match
AB
No match
/(a(?i)b)/DZ
------------------------------------------------------------------
Bra
CBra 1
a
/i b
Ket
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 1
No options
First char = 'a'
Need char = 'b' (caseless)
ab
0: ab
1: ab
aB
0: aB
1: aB
*** Failers
No match
AB
No match
/ (?i)abc/IxDZ
------------------------------------------------------------------
Bra
/i abc
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
Options: extended
First char = 'a' (caseless)
Need char = 'c' (caseless)
/#this is a comment
(?i)abc/IxDZ
------------------------------------------------------------------
Bra
/i abc
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
Options: extended
First char = 'a' (caseless)
Need char = 'c' (caseless)
/123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890/DZ
------------------------------------------------------------------
Bra
123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
No options
First char = '1'
Need char = '0'
/\Q123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890/DZ
------------------------------------------------------------------
Bra
123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
No options
First char = '1'
Need char = '0'
/\Q\E/DZ
------------------------------------------------------------------
Bra
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
May match empty string
No options
No first char
No need char
\
0:
/\Q\Ex/DZ
------------------------------------------------------------------
Bra
x
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
No options
First char = 'x'
No need char
/ \Q\E/DZ
------------------------------------------------------------------
Bra
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
No options
First char = ' '
No need char
/a\Q\E/DZ
------------------------------------------------------------------
Bra
a
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
No options
First char = 'a'
No need char
abc
0: a
bca
0: a
bac
0: a
/a\Q\Eb/DZ
------------------------------------------------------------------
Bra
ab
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
No options
First char = 'a'
Need char = 'b'
abc
0: ab
/\Q\Eabc/DZ
------------------------------------------------------------------
Bra
abc
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
No options
First char = 'a'
Need char = 'c'
/x*+\w/DZ
------------------------------------------------------------------
Bra
x*+
\w
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
No options
No first char
No need char
*** Failers
0: F
xxxxx
No match
/x?+/DZ
------------------------------------------------------------------
Bra
x?+
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
May match empty string
No options
No first char
No need char
/x++/DZ
------------------------------------------------------------------
Bra
x++
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
No options
First char = 'x'
No need char
/x{1,3}+/BZO
------------------------------------------------------------------
Bra
x
x{0,2}+
Ket
End
------------------------------------------------------------------
/x{1,3}+/BZOi
------------------------------------------------------------------
Bra
/i x
/i x{0,2}+
Ket
End
------------------------------------------------------------------
/[^x]{1,3}+/BZO
------------------------------------------------------------------
Bra
[^x]
[^x]{0,2}+
Ket
End
------------------------------------------------------------------
/[^x]{1,3}+/BZOi
------------------------------------------------------------------
Bra
/i [^x]
/i [^x]{0,2}+
Ket
End
------------------------------------------------------------------
/(x)*+/DZ
------------------------------------------------------------------
Bra
Braposzero
CBraPos 1
x
KetRpos
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 1
May match empty string
No options
No first char
No need char
/^(\w++|\s++)*$/I
Capturing subpattern count = 1
May match empty string
Options: anchored
No first char
No need char
now is the time for all good men to come to the aid of the party
0: now is the time for all good men to come to the aid of the party
1: party
*** Failers
No match
this is not a line with only words and spaces!
No match
/(\d++)(\w)/I
Capturing subpattern count = 2
No options
No first char
No need char
12345a
0: 12345a
1: 12345
2: a
*** Failers
No match
12345+
No match
/a++b/I
Capturing subpattern count = 0
No options
First char = 'a'
Need char = 'b'
aaab
0: aaab
/(a++b)/I
Capturing subpattern count = 1
No options
First char = 'a'
Need char = 'b'
aaab
0: aaab
1: aaab
/(a++)b/I
Capturing subpattern count = 1
No options
First char = 'a'
Need char = 'b'
aaab
0: aaab
1: aaa
/([^()]++|\([^()]*\))+/I
Capturing subpattern count = 1
No options
No first char
No need char
((abc(ade)ufh()()x
0: abc(ade)ufh()()x
1: x
/\(([^()]++|\([^()]+\))+\)/I
Capturing subpattern count = 1
No options
First char = '('
Need char = ')'
(abc)
0: (abc)
1: abc
(abc(def)xyz)
0: (abc(def)xyz)
1: xyz
*** Failers
No match
((()aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
No match
/(abc){1,3}+/DZ
------------------------------------------------------------------
Bra
Once
CBra 1
abc
Ket
Brazero
Bra
CBra 1
abc
Ket
Brazero
CBra 1
abc
Ket
Ket
Ket
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 1
No options
First char = 'a'
Need char = 'c'
/a+?+/I
Failed: nothing to repeat at offset 3
/a{2,3}?+b/I
Failed: nothing to repeat at offset 7
/(?U)a+?+/I
Failed: nothing to repeat at offset 7
/a{2,3}?+b/IU
Failed: nothing to repeat at offset 7
/x(?U)a++b/DZ
------------------------------------------------------------------
Bra
x
a++
b
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
No options
First char = 'x'
Need char = 'b'
xaaaab
0: xaaaab
/(?U)xa++b/DZ
------------------------------------------------------------------
Bra
x
a++
b
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
No options
First char = 'x'
Need char = 'b'
xaaaab
0: xaaaab
/^((a+)(?U)([ab]+)(?-U)([bc]+)(\w*))/DZ
------------------------------------------------------------------
Bra
^
CBra 1
CBra 2
a+
Ket
CBra 3
[ab]+?
Ket
CBra 4
[bc]+
Ket
CBra 5
\w*+
Ket
Ket
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 5
Options: anchored
No first char
No need char
/^x(?U)a+b/DZ
------------------------------------------------------------------
Bra
^
x
a++
b
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
Options: anchored
No first char
Need char = 'b'
/^x(?U)(a+)b/DZ
------------------------------------------------------------------
Bra
^
x
CBra 1
a+?
Ket
b
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 1
Options: anchored
No first char
Need char = 'b'
/[.x.]/I
Failed: POSIX collating elements are not supported at offset 0
/[=x=]/I
Failed: POSIX collating elements are not supported at offset 0
/[:x:]/I
Failed: POSIX named classes are supported only within a class at offset 0
/\l/I
Failed: PCRE does not support \L, \l, \N{name}, \U, or \u at offset 1
/\L/I
Failed: PCRE does not support \L, \l, \N{name}, \U, or \u at offset 1
/\N{name}/I
Failed: PCRE does not support \L, \l, \N{name}, \U, or \u at offset 1
/\u/I
Failed: PCRE does not support \L, \l, \N{name}, \U, or \u at offset 1
/\U/I
Failed: PCRE does not support \L, \l, \N{name}, \U, or \u at offset 1
/a{1,3}b/U
ab
0: ab
/[/I
Failed: missing terminating ] for character class at offset 1
/[a-/I
Failed: missing terminating ] for character class at offset 3
/[[:space:]/I
Failed: missing terminating ] for character class at offset 10
/[\s]/IDZ
------------------------------------------------------------------
Bra
[\x09-\x0d ]
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
No options
No first char
No need char
/[[:space:]]/IDZ
------------------------------------------------------------------
Bra
[\x09-\x0d ]
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
No options
No first char
No need char
/[[:space:]abcde]/IDZ
------------------------------------------------------------------
Bra
[\x09-\x0d a-e]
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
No options
No first char
No need char
/< (?: (?(R) \d++ | [^<>]*+) | (?R)) * >/Ix
Capturing subpattern count = 0
Options: extended
First char = '<'
Need char = '>'
<>
0: <>
<abcd>
0: <abcd>
<abc <123> hij>
0: <abc <123> hij>
<abc <def> hij>
0: <def>
<abc<>def>
0: <abc<>def>
<abc<>
0: <>
*** Failers
No match
<abc
No match
|8J\$WE\<\.rX\+ix\[d1b\!H\#\?vV0vrK\:ZH1\=2M\>iV\;\?aPhFB\<\*vW\@QW\@sO9\}cfZA\-i\'w\%hKd6gt1UJP\,15_\#QY\$M\^Mss_U\/\]\&LK9\[5vQub\^w\[KDD\<EjmhUZ\?\.akp2dF\>qmj\;2\}YWFdYx\.Ap\]hjCPTP\(n28k\+3\;o\&WXqs\/gOXdr\$\:r\'do0\;b4c\(f_Gr\=\"\\4\)\[01T7ajQJvL\$W\~mL_sS\/4h\:x\*\[ZN\=KLs\&L5zX\/\/\>it\,o\:aU\(\;Z\>pW\&T7oP\'2K\^E\:x9\'c\[\%z\-\,64JQ5AeH_G\#KijUKghQw\^\\vea3a\?kka_G\$8\#\`\*kynsxzBLru\'\]k_\[7FrVx\}\^\=\$blx\>s\-N\%j\;D\*aZDnsw\:YKZ\%Q\.Kne9\#hP\?\+b3\(SOvL\,\^\;\&u5\@\?5C5Bhb\=m\-vEh_L15Jl\]U\)0RP6\{q\%L\^_z5E\'Dw6X\b|IDZ
------------------------------------------------------------------
Bra
8J$WE<.rX+ix[d1b!H#?vV0vrK:ZH1=2M>iV;?aPhFB<*vW@QW@sO9}cfZA-i'w%hKd6gt1UJP,15_#QY$M^Mss_U/]&LK9[5vQub^w[KDD<EjmhUZ?.akp2dF>qmj;2}YWFdYx.Ap]hjCPTP(n28k+3;o&WXqs/gOXdr$:r'do0;b4c(f_Gr="\4)[01T7ajQJvL$W~mL_sS/4h:x*[ZN=KLs&L5zX//>it,o:aU(;Z>pW&T7oP'2K^E:x9'c[%z-,64JQ5AeH_G#KijUKghQw^\vea3a?kka_G$8#`*kynsxzBLru']k_[7FrVx}^=$blx>s-N%j;D*aZDnsw:YKZ%Q.Kne9#hP?+b3(SOvL,^;&u5@?5C5Bhb=m-vEh_L15Jl]U)0RP6{q%L^_z5E'Dw6X
\b
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
Max lookbehind = 1
No options
First char = '8'
Need char = 'X'
|\$\<\.X\+ix\[d1b\!H\#\?vV0vrK\:ZH1\=2M\>iV\;\?aPhFB\<\*vW\@QW\@sO9\}cfZA\-i\'w\%hKd6gt1UJP\,15_\#QY\$M\^Mss_U\/\]\&LK9\[5vQub\^w\[KDD\<EjmhUZ\?\.akp2dF\>qmj\;2\}YWFdYx\.Ap\]hjCPTP\(n28k\+3\;o\&WXqs\/gOXdr\$\:r\'do0\;b4c\(f_Gr\=\"\\4\)\[01T7ajQJvL\$W\~mL_sS\/4h\:x\*\[ZN\=KLs\&L5zX\/\/\>it\,o\:aU\(\;Z\>pW\&T7oP\'2K\^E\:x9\'c\[\%z\-\,64JQ5AeH_G\#KijUKghQw\^\\vea3a\?kka_G\$8\#\`\*kynsxzBLru\'\]k_\[7FrVx\}\^\=\$blx\>s\-N\%j\;D\*aZDnsw\:YKZ\%Q\.Kne9\#hP\?\+b3\(SOvL\,\^\;\&u5\@\?5C5Bhb\=m\-vEh_L15Jl\]U\)0RP6\{q\%L\^_z5E\'Dw6X\b|IDZ
------------------------------------------------------------------
Bra
$<.X+ix[d1b!H#?vV0vrK:ZH1=2M>iV;?aPhFB<*vW@QW@sO9}cfZA-i'w%hKd6gt1UJP,15_#QY$M^Mss_U/]&LK9[5vQub^w[KDD<EjmhUZ?.akp2dF>qmj;2}YWFdYx.Ap]hjCPTP(n28k+3;o&WXqs/gOXdr$:r'do0;b4c(f_Gr="\4)[01T7ajQJvL$W~mL_sS/4h:x*[ZN=KLs&L5zX//>it,o:aU(;Z>pW&T7oP'2K^E:x9'c[%z-,64JQ5AeH_G#KijUKghQw^\vea3a?kka_G$8#`*kynsxzBLru']k_[7FrVx}^=$blx>s-N%j;D*aZDnsw:YKZ%Q.Kne9#hP?+b3(SOvL,^;&u5@?5C5Bhb=m-vEh_L15Jl]U)0RP6{q%L^_z5E'Dw6X
\b
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
Max lookbehind = 1
No options
First char = '$'
Need char = 'X'
/(.*)\d+\1/I
Capturing subpattern count = 1
Max back reference = 1
No options
No first char
No need char
/(.*)\d+/I
Capturing subpattern count = 1
No options
First char at start or follows newline
No need char
/(.*)\d+\1/Is
Capturing subpattern count = 1
Max back reference = 1
Options: dotall
No first char
No need char
/(.*)\d+/Is
Capturing subpattern count = 1
Options: anchored dotall
No first char
No need char
/(.*(xyz))\d+\2/I
Capturing subpattern count = 2
Max back reference = 2
No options
First char at start or follows newline
Need char = 'z'
/((.*))\d+\1/I
Capturing subpattern count = 2
Max back reference = 1
No options
No first char
No need char
abc123bc
0: bc123bc
1: bc
2: bc
/a[b]/I
Capturing subpattern count = 0
No options
First char = 'a'
Need char = 'b'
/(?=a).*/I
Capturing subpattern count = 0
May match empty string
No options
First char = 'a'
No need char
/(?=abc).xyz/IiI
Capturing subpattern count = 0
Options: caseless
First char = 'a' (caseless)
Need char = 'z' (caseless)
/(?=abc)(?i).xyz/I
Capturing subpattern count = 0
No options
First char = 'a'
Need char = 'z' (caseless)
/(?=a)(?=b)/I
Capturing subpattern count = 0
May match empty string
No options
First char = 'a'
No need char
/(?=.)a/I
Capturing subpattern count = 0
No options
First char = 'a'
No need char
/((?=abcda)a)/I
Capturing subpattern count = 1
No options
First char = 'a'
Need char = 'a'
/((?=abcda)ab)/I
Capturing subpattern count = 1
No options
First char = 'a'
Need char = 'b'
/()a/I
Capturing subpattern count = 1
No options
No first char
Need char = 'a'
/(?(1)ab|ac)(.)/I
Capturing subpattern count = 1
Max back reference = 1
No options
First char = 'a'
No need char
/(?(1)abz|acz)(.)/I
Capturing subpattern count = 1
Max back reference = 1
No options
First char = 'a'
Need char = 'z'
/(?(1)abz)(.)/I
Capturing subpattern count = 1
Max back reference = 1
No options
No first char
No need char
/(?(1)abz)(1)23/I
Capturing subpattern count = 1
Max back reference = 1
No options
No first char
Need char = '3'
/(a)+/I
Capturing subpattern count = 1
No options
First char = 'a'
No need char
/(a){2,3}/I
Capturing subpattern count = 1
No options
First char = 'a'
Need char = 'a'
/(a)*/I
Capturing subpattern count = 1
May match empty string
No options
No first char
No need char
/[a]/I
Capturing subpattern count = 0
No options
First char = 'a'
No need char
/[ab]/I
Capturing subpattern count = 0
No options
No first char
No need char
/[ab]/IS
Capturing subpattern count = 0
No options
No first char
No need char
Subject length lower bound = 1
Starting chars: a b
/[^a]/I
Capturing subpattern count = 0
No options
No first char
No need char
/\d456/I
Capturing subpattern count = 0
No options
No first char
Need char = '6'
/\d456/IS
Capturing subpattern count = 0
No options
No first char
Need char = '6'
Subject length lower bound = 4
Starting chars: 0 1 2 3 4 5 6 7 8 9
/a^b/I
Capturing subpattern count = 0
No options
First char = 'a'
Need char = 'b'
/^a/Im
Capturing subpattern count = 0
Options: multiline
First char at start or follows newline
Need char = 'a'
abcde
0: a
xy\nabc
0: a
*** Failers
No match
xyabc
No match
/c|abc/I
Capturing subpattern count = 0
No options
No first char
Need char = 'c'
/(?i)[ab]/IS
Capturing subpattern count = 0
No options
No first char
No need char
Subject length lower bound = 1
Starting chars: A B a b
/[ab](?i)cd/IS
Capturing subpattern count = 0
No options
No first char
Need char = 'd' (caseless)
Subject length lower bound = 3
Starting chars: a b
/abc(?C)def/I
Capturing subpattern count = 0
No options
First char = 'a'
Need char = 'f'
abcdef
--->abcdef
0 ^ ^ d
0: abcdef
1234abcdef
--->1234abcdef
0 ^ ^ d
0: abcdef
*** Failers
No match
abcxyz
No match
abcxyzf
--->abcxyzf
0 ^ ^ d
No match
/abc(?C)de(?C1)f/I
Capturing subpattern count = 0
No options
First char = 'a'
Need char = 'f'
123abcdef
--->123abcdef
0 ^ ^ d
1 ^ ^ f
0: abcdef
/(?C1)\dabc(?C2)def/IS
Capturing subpattern count = 0
No options
No first char
Need char = 'f'
Subject length lower bound = 7
Starting chars: 0 1 2 3 4 5 6 7 8 9
1234abcdef
--->1234abcdef
1 ^ \d
1 ^ \d
1 ^ \d
1 ^ \d
2 ^ ^ d
0: 4abcdef
*** Failers
No match
abcdef
No match
/(?C1)\dabc(?C2)def/ISS
Capturing subpattern count = 0
No options
No first char
Need char = 'f'
1234abcdef
--->1234abcdef
1 ^ \d
1 ^ \d
1 ^ \d
1 ^ \d
2 ^ ^ d
0: 4abcdef
*** Failers
No match
abcdef
--->abcdef
1 ^ \d
1 ^ \d
1 ^ \d
1 ^ \d
1 ^ \d
1 ^ \d
No match
/(?C255)ab/I
Capturing subpattern count = 0
No options
First char = 'a'
Need char = 'b'
/(?C256)ab/I
Failed: number after (?C is > 255 at offset 6
/(?Cab)xx/I
Failed: closing ) for (?C expected at offset 3
/(?C12vr)x/I
Failed: closing ) for (?C expected at offset 5
/abc(?C)def/I
Capturing subpattern count = 0
No options
First char = 'a'
Need char = 'f'
*** Failers
No match
\x83\x0\x61bcdef
--->\x83\x00abcdef
0 ^ ^ d
0: abcdef
/(abc)(?C)de(?C1)f/I
Capturing subpattern count = 1
No options
First char = 'a'
Need char = 'f'
123abcdef
--->123abcdef
0 ^ ^ d
1 ^ ^ f
0: abcdef
1: abc
123abcdef\C+
Callout 0: last capture = 1
0: <unset>
1: abc
--->123abcdef
^ ^ d
Callout 1: last capture = 1
0: <unset>
1: abc
--->123abcdef
^ ^ f
0: abcdef
1: abc
123abcdef\C-
0: abcdef
1: abc
*** Failers
No match
123abcdef\C!1
--->123abcdef
0 ^ ^ d
1 ^ ^ f
No match
/(?C0)(abc(?C1))*/I
Capturing subpattern count = 1
May match empty string
No options
No first char
No need char
abcabcabc
--->abcabcabc
0 ^ (abc(?C1))*
1 ^ ^ )
1 ^ ^ )
1 ^ ^ )
0: abcabcabc
1: abc
abcabc\C!1!3
--->abcabc
0 ^ (abc(?C1))*
1 ^ ^ )
1 ^ ^ )
0: abcabc
1: abc
*** Failers
--->*** Failers
0 ^ (abc(?C1))*
0:
abcabcabc\C!1!3
--->abcabcabc
0 ^ (abc(?C1))*
1 ^ ^ )
1 ^ ^ )
1 ^ ^ )
0: abcabc
1: abc
/(\d{3}(?C))*/I
Capturing subpattern count = 1
May match empty string
No options
No first char
No need char
123\C+
Callout 0: last capture = -1
0: <unset>
--->123
^ ^ )
0: 123
1: 123
123456\C+
Callout 0: last capture = -1
0: <unset>
--->123456
^ ^ )
Callout 0: last capture = 1
0: <unset>
1: 123
--->123456
^ ^ )
0: 123456
1: 456
123456789\C+
Callout 0: last capture = -1
0: <unset>
--->123456789
^ ^ )
Callout 0: last capture = 1
0: <unset>
1: 123
--->123456789
^ ^ )
Callout 0: last capture = 1
0: <unset>
1: 456
--->123456789
^ ^ )
0: 123456789
1: 789
/((xyz)(?C)p|(?C1)xyzabc)/I
Capturing subpattern count = 2
No options
First char = 'x'
No need char
xyzabc\C+
Callout 0: last capture = 2
0: <unset>
1: <unset>
2: xyz
--->xyzabc
^ ^ p
Callout 1: last capture = -1
0: <unset>
--->xyzabc
^ x
0: xyzabc
1: xyzabc
/(X)((xyz)(?C)p|(?C1)xyzabc)/I
Capturing subpattern count = 3
No options
First char = 'X'
Need char = 'x'
Xxyzabc\C+
Callout 0: last capture = 3
0: <unset>
1: X
2: <unset>
3: xyz
--->Xxyzabc
^ ^ p
Callout 1: last capture = 1
0: <unset>
1: X
--->Xxyzabc
^^ x
0: Xxyzabc
1: X
2: xyzabc
/(?=(abc))(?C)abcdef/I
Capturing subpattern count = 1
No options
First char = 'a'
Need char = 'f'
abcdef\C+
Callout 0: last capture = 1
0: <unset>
1: abc
--->abcdef
^ a
0: abcdef
1: abc
/(?!(abc)(?C1)d)(?C2)abcxyz/I
Capturing subpattern count = 1
No options
First char = 'a'
Need char = 'z'
abcxyz\C+
Callout 1: last capture = 1
0: <unset>
1: abc
--->abcxyz
^ ^ d
Callout 2: last capture = -1
0: <unset>
--->abcxyz
^ a
0: abcxyz
/(?<=(abc)(?C))xyz/I
Capturing subpattern count = 1
Max lookbehind = 3
No options
First char = 'x'
Need char = 'z'
abcxyz\C+
Callout 0: last capture = 1
0: <unset>
1: abc
--->abcxyz
^ )
0: xyz
1: abc
/a(b+)(c*)(?C1)/I
Capturing subpattern count = 2
No options
First char = 'a'
Need char = 'b'
abbbbbccc\C*1
--->abbbbbccc
1 ^ ^
Callout data = 1
No match
/a(b+?)(c*?)(?C1)/I
Capturing subpattern count = 2
No options
First char = 'a'
Need char = 'b'
abbbbbccc\C*1
--->abbbbbccc
1 ^ ^
Callout data = 1
1 ^ ^
Callout data = 1
1 ^ ^
Callout data = 1
1 ^ ^
Callout data = 1
1 ^ ^
Callout data = 1
1 ^ ^
Callout data = 1
1 ^ ^
Callout data = 1
1 ^ ^
Callout data = 1
No match
/(?C)abc/I
Capturing subpattern count = 0
No options
First char = 'a'
Need char = 'c'
/(?C)^abc/I
Capturing subpattern count = 0
Options: anchored
No first char
No need char
/(?C)a|b/IS
Capturing subpattern count = 0
No options
No first char
No need char
Subject length lower bound = 1
Starting chars: a b
/(?R)/I
Failed: recursive call could loop indefinitely at offset 3
/(a|(?R))/I
Failed: recursive call could loop indefinitely at offset 6
/(ab|(bc|(de|(?R))))/I
Failed: recursive call could loop indefinitely at offset 15
/x(ab|(bc|(de|(?R))))/I
Capturing subpattern count = 3
No options
First char = 'x'
No need char
xab
0: xab
1: ab
xbc
0: xbc
1: bc
2: bc
xde
0: xde
1: de
2: de
3: de
xxab
0: xxab
1: xab
2: xab
3: xab
xxxab
0: xxxab
1: xxab
2: xxab
3: xxab
*** Failers
No match
xyab
No match
/(ab|(bc|(de|(?1))))/I
Failed: recursive call could loop indefinitely at offset 15
/x(ab|(bc|(de|(?1)x)x)x)/I
Failed: recursive call could loop indefinitely at offset 16
/^([^()]|\((?1)*\))*$/I
Capturing subpattern count = 1
May match empty string
Options: anchored
No first char
No need char
abc
0: abc
1: c
a(b)c
0: a(b)c
1: c
a(b(c))d
0: a(b(c))d
1: d
*** Failers)
No match
a(b(c)d
No match
/^>abc>([^()]|\((?1)*\))*<xyz<$/I
Capturing subpattern count = 1
Options: anchored
No first char
Need char = '<'
>abc>123<xyz<
0: >abc>123<xyz<
1: 3
>abc>1(2)3<xyz<
0: >abc>1(2)3<xyz<
1: 3
>abc>(1(2)3)<xyz<
0: >abc>(1(2)3)<xyz<
1: (1(2)3)
/(a(?1)b)/DZ
------------------------------------------------------------------
Bra
CBra 1
a
Recurse
b
Ket
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 1
No options
First char = 'a'
Need char = 'b'
/(a(?1)+b)/DZ
------------------------------------------------------------------
Bra
CBra 1
a
Once
Recurse
KetRmax
b
Ket
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 1
No options
First char = 'a'
Need char = 'b'
/^(\d+|\((?1)([+*-])(?1)\)|-(?1))$/I
Capturing subpattern count = 2
Options: anchored
No first char
No need char
12
0: 12
1: 12
(((2+2)*-3)-7)
0: (((2+2)*-3)-7)
1: (((2+2)*-3)-7)
2: -
-12
0: -12
1: -12
*** Failers
No match
((2+2)*-3)-7)
No match
/^(x(y|(?1){2})z)/I
Capturing subpattern count = 2
Options: anchored
No first char
No need char
xyz
0: xyz
1: xyz
2: y
xxyzxyzz
0: xxyzxyzz
1: xxyzxyzz
2: xyzxyz
*** Failers
No match
xxyzz
No match
xxyzxyzxyzz
No match
/((< (?: (?(R) \d++ | [^<>]*+) | (?2)) * >))/Ix
Capturing subpattern count = 2
Options: extended
First char = '<'
Need char = '>'
<>
0: <>
1: <>
2: <>
<abcd>
0: <abcd>
1: <abcd>
2: <abcd>
<abc <123> hij>
0: <abc <123> hij>
1: <abc <123> hij>
2: <abc <123> hij>
<abc <def> hij>
0: <def>
1: <def>
2: <def>
<abc<>def>
0: <abc<>def>
1: <abc<>def>
2: <abc<>def>
<abc<>
0: <>
1: <>
2: <>
*** Failers
No match
<abc
No match
/(?1)/I
Failed: reference to non-existent subpattern at offset 3
/((?2)(abc)/I
Failed: missing ) at offset 10
/^(abc)def(?1)/I
Capturing subpattern count = 1
Options: anchored
No first char
No need char
abcdefabc
0: abcdefabc
1: abc
/^(a|b|c)=(?1)+/I
Capturing subpattern count = 1
Options: anchored
No first char
No need char
a=a
0: a=a
1: a
a=b
0: a=b
1: a
a=bc
0: a=bc
1: a
/^(a|b|c)=((?1))+/I
Capturing subpattern count = 2
Options: anchored
No first char
No need char
a=a
0: a=a
1: a
2: a
a=b
0: a=b
1: a
2: b
a=bc
0: a=bc
1: a
2: c
/a(?P<name1>b|c)d(?P<longername2>e)/DZ
------------------------------------------------------------------
Bra
a
CBra 1
b
Alt
c
Ket
d
CBra 2
e
Ket
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 2
Named capturing subpatterns:
longername2 2
name1 1
No options
First char = 'a'
Need char = 'e'
abde
0: abde
1: b
2: e
acde
0: acde
1: c
2: e
/(?:a(?P<c>c(?P<d>d)))(?P<a>a)/DZ
------------------------------------------------------------------
Bra
Bra
a
CBra 1
c
CBra 2
d
Ket
Ket
Ket
CBra 3
a
Ket
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 3
Named capturing subpatterns:
a 3
c 1
d 2
No options
First char = 'a'
Need char = 'a'
/(?P<a>a)...(?P=a)bbb(?P>a)d/DZ
------------------------------------------------------------------
Bra
CBra 1
a
Ket
Any
Any
Any
\1
bbb
Recurse
d
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 1
Max back reference = 1
Named capturing subpatterns:
a 1
No options
First char = 'a'
Need char = 'd'
/^\W*(?:(?P<one>(?P<two>.)\W*(?P>one)\W*(?P=two)|)|(?P<three>(?P<four>.)\W*(?P>three)\W*(?P=four)|\W*.\W*))\W*$/Ii
Capturing subpattern count = 4
Max back reference = 4
Named capturing subpatterns:
four 4
one 1
three 3
two 2
May match empty string
Options: anchored caseless
No first char
No need char
1221
0: 1221
1: 1221
2: 1
Satan, oscillate my metallic sonatas!
0: Satan, oscillate my metallic sonatas!
1: <unset>
2: <unset>
3: Satan, oscillate my metallic sonatas
4: S
A man, a plan, a canal: Panama!
0: A man, a plan, a canal: Panama!
1: <unset>
2: <unset>
3: A man, a plan, a canal: Panama
4: A
Able was I ere I saw Elba.
0: Able was I ere I saw Elba.
1: <unset>
2: <unset>
3: Able was I ere I saw Elba
4: A
*** Failers
No match
The quick brown fox
No match
/((?(R)a|b))\1(?1)?/I
Capturing subpattern count = 1
Max back reference = 1
No options
No first char
No need char
bb
0: bb
1: b
bbaa
0: bba
1: b
/(.*)a/Is
Capturing subpattern count = 1
Options: anchored dotall
No first char
Need char = 'a'
/(.*)a\1/Is
Capturing subpattern count = 1
Max back reference = 1
Options: dotall
No first char
Need char = 'a'
/(.*)a(b)\2/Is
Capturing subpattern count = 2
Max back reference = 2
Options: anchored dotall
No first char
Need char = 'b'
/((.*)a|(.*)b)z/Is
Capturing subpattern count = 3
Options: anchored dotall
No first char
Need char = 'z'
/((.*)a|(.*)b)z\1/Is
Capturing subpattern count = 3
Max back reference = 1
Options: dotall
No first char
Need char = 'z'
/((.*)a|(.*)b)z\2/Is
Capturing subpattern count = 3
Max back reference = 2
Options: dotall
No first char
Need char = 'z'
/((.*)a|(.*)b)z\3/Is
Capturing subpattern count = 3
Max back reference = 3
Options: dotall
No first char
Need char = 'z'
/((.*)a|^(.*)b)z\3/Is
Capturing subpattern count = 3
Max back reference = 3
Options: anchored dotall
No first char
Need char = 'z'
/(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)a/Is
Capturing subpattern count = 31
May match empty string
Options: anchored dotall
No first char
No need char
/(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)a\31/Is
Capturing subpattern count = 31
Max back reference = 31
May match empty string
Options: dotall
No first char
No need char
/(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)a\32/Is
Capturing subpattern count = 32
Max back reference = 32
May match empty string
Options: dotall
No first char
No need char
/(a)(bc)/INDZ
------------------------------------------------------------------
Bra
Bra
a
Ket
Bra
bc
Ket
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
Options: no_auto_capture
First char = 'a'
Need char = 'c'
abc
0: abc
/(?P<one>a)(bc)/INDZ
------------------------------------------------------------------
Bra
CBra 1
a
Ket
Bra
bc
Ket
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 1
Named capturing subpatterns:
one 1
Options: no_auto_capture
First char = 'a'
Need char = 'c'
abc
0: abc
1: a
/(a)(?P<named>bc)/INDZ
------------------------------------------------------------------
Bra
Bra
a
Ket
CBra 1
bc
Ket
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 1
Named capturing subpatterns:
named 1
Options: no_auto_capture
First char = 'a'
Need char = 'c'
/(a+)*zz/I
Capturing subpattern count = 1
No options
No first char
Need char = 'z'
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaazzbbbbbb\M
Minimum match() limit = 8
Minimum match() recursion limit = 6
0: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaazz
1: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaz\M
Minimum match() limit = 32768
Minimum match() recursion limit = 29
No match
/(aaa(?C1)bbb|ab)/I
Capturing subpattern count = 1
No options
First char = 'a'
Need char = 'b'
aaabbb
--->aaabbb
1 ^ ^ b
0: aaabbb
1: aaabbb
aaabbb\C*0
--->aaabbb
1 ^ ^ b
0: aaabbb
1: aaabbb
aaabbb\C*1
--->aaabbb
1 ^ ^ b
Callout data = 1
0: ab
1: ab
aaabbb\C*-1
--->aaabbb
1 ^ ^ b
Callout data = -1
No match
/ab(?P<one>cd)ef(?P<two>gh)/I
Capturing subpattern count = 2
Named capturing subpatterns:
one 1
two 2
No options
First char = 'a'
Need char = 'h'
abcdefgh
0: abcdefgh
1: cd
2: gh
abcdefgh\C1\Gtwo
0: abcdefgh
1: cd
2: gh
1C cd (2)
G gh (2) two
abcdefgh\Cone\Ctwo
0: abcdefgh
1: cd
2: gh
C cd (2) one
C gh (2) two
abcdefgh\Cthree
no parentheses with name "three"
0: abcdefgh
1: cd
2: gh
copy substring three failed -7
/(?P<Tes>)(?P<Test>)/DZ
------------------------------------------------------------------
Bra
CBra 1
Ket
CBra 2
Ket
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 2
Named capturing subpatterns:
Tes 1
Test 2
May match empty string
No options
No first char
No need char
/(?P<Test>)(?P<Tes>)/DZ
------------------------------------------------------------------
Bra
CBra 1
Ket
CBra 2
Ket
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 2
Named capturing subpatterns:
Tes 2
Test 1
May match empty string
No options
No first char
No need char
/(?P<Z>zz)(?P<A>aa)/I
Capturing subpattern count = 2
Named capturing subpatterns:
A 2
Z 1
No options
First char = 'z'
Need char = 'a'
zzaa\CZ
0: zzaa
1: zz
2: aa
C zz (2) Z
zzaa\CA
0: zzaa
1: zz
2: aa
C aa (2) A
/(?P<x>eks)(?P<x>eccs)/I
Failed: two named subpatterns have the same name at offset 15
/(?P<abc>abc(?P<def>def)(?P<abc>xyz))/I
Failed: two named subpatterns have the same name at offset 30
"\[((?P<elem>\d+)(,(?P>elem))*)\]"I
Capturing subpattern count = 3
Named capturing subpatterns:
elem 2
No options
First char = '['
Need char = ']'
[10,20,30,5,5,4,4,2,43,23,4234]
0: [10,20,30,5,5,4,4,2,43,23,4234]
1: 10,20,30,5,5,4,4,2,43,23,4234
2: 10
3: ,4234
*** Failers
No match
[]
No match
"\[((?P<elem>\d+)(,(?P>elem))*)?\]"I
Capturing subpattern count = 3
Named capturing subpatterns:
elem 2
No options
First char = '['
Need char = ']'
[10,20,30,5,5,4,4,2,43,23,4234]
0: [10,20,30,5,5,4,4,2,43,23,4234]
1: 10,20,30,5,5,4,4,2,43,23,4234
2: 10
3: ,4234
[]
0: []
/(a(b(?2)c))?/DZ
------------------------------------------------------------------
Bra
Brazero
CBra 1
a
CBra 2
b
Recurse
c
Ket
Ket
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 2
May match empty string
No options
No first char
No need char
/(a(b(?2)c))*/DZ
------------------------------------------------------------------
Bra
Brazero
CBra 1
a
CBra 2
b
Recurse
c
Ket
KetRmax
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 2
May match empty string
No options
No first char
No need char
/(a(b(?2)c)){0,2}/DZ
------------------------------------------------------------------
Bra
Brazero
Bra
CBra 1
a
CBra 2
b
Recurse
c
Ket
Ket
Brazero
CBra 1
a
CBra 2
b
Recurse
c
Ket
Ket
Ket
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 2
May match empty string
No options
No first char
No need char
/[ab]{1}+/DZ
------------------------------------------------------------------
Bra
[ab]{1,1}+
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
No options
No first char
No need char
/((w\/|-|with)*(free|immediate)*.*?shipping\s*[!.-]*)/Ii
Capturing subpattern count = 3
Options: caseless
No first char
Need char = 'g' (caseless)
Baby Bjorn Active Carrier - With free SHIPPING!!
0: Baby Bjorn Active Carrier - With free SHIPPING!!
1: Baby Bjorn Active Carrier - With free SHIPPING!!
/((w\/|-|with)*(free|immediate)*.*?shipping\s*[!.-]*)/IiS
Capturing subpattern count = 3
Options: caseless
No first char
Need char = 'g' (caseless)
Subject length lower bound = 8
No starting char list
Baby Bjorn Active Carrier - With free SHIPPING!!
0: Baby Bjorn Active Carrier - With free SHIPPING!!
1: Baby Bjorn Active Carrier - With free SHIPPING!!
/a*.*b/ISDZ
------------------------------------------------------------------
Bra
a*
Any*
b
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
No options
No first char
Need char = 'b'
Subject length lower bound = 1
No starting char list
/(a|b)*.?c/ISDZ
------------------------------------------------------------------
Bra
Brazero
CBra 1
a
Alt
b
KetRmax
Any?
c
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 1
No options
No first char
Need char = 'c'
Subject length lower bound = 1
No starting char list
/abc(?C255)de(?C)f/DZ
------------------------------------------------------------------
Bra
abc
Callout 255 10 1
de
Callout 0 16 1
f
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
No options
First char = 'a'
Need char = 'f'
/abcde/ICDZ
------------------------------------------------------------------
Bra
Callout 255 0 1
a
Callout 255 1 1
b
Callout 255 2 1
c
Callout 255 3 1
d
Callout 255 4 1
e
Callout 255 5 0
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
Options:
First char = 'a'
Need char = 'e'
abcde
--->abcde
+0 ^ a
+1 ^^ b
+2 ^ ^ c
+3 ^ ^ d
+4 ^ ^ e
+5 ^ ^
0: abcde
abcdfe
--->abcdfe
+0 ^ a
+1 ^^ b
+2 ^ ^ c
+3 ^ ^ d
+4 ^ ^ e
No match
/a*b/ICDZS
------------------------------------------------------------------
Bra
Callout 255 0 2
a*+
Callout 255 2 1
b
Callout 255 3 0
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
Options:
No first char
Need char = 'b'
Subject length lower bound = 1
Starting chars: a b
ab
--->ab
+0 ^ a*
+2 ^^ b
+3 ^ ^
0: ab
aaaab
--->aaaab
+0 ^ a*
+2 ^ ^ b
+3 ^ ^
0: aaaab
aaaacb
--->aaaacb
+0 ^ a*
+2 ^ ^ b
+0 ^ a*
+2 ^ ^ b
+0 ^ a*
+2 ^ ^ b
+0 ^ a*
+2 ^^ b
+0 ^ a*
+2 ^ b
+3 ^^
0: b
/a*b/ICDZSS
------------------------------------------------------------------
Bra
Callout 255 0 2
a*+
Callout 255 2 1
b
Callout 255 3 0
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
Options:
No first char
Need char = 'b'
ab
--->ab
+0 ^ a*
+2 ^^ b
+3 ^ ^
0: ab
aaaab
--->aaaab
+0 ^ a*
+2 ^ ^ b
+3 ^ ^
0: aaaab
aaaacb
--->aaaacb
+0 ^ a*
+2 ^ ^ b
+0 ^ a*
+2 ^ ^ b
+0 ^ a*
+2 ^ ^ b
+0 ^ a*
+2 ^^ b
+0 ^ a*
+2 ^ b
+0 ^ a*
+2 ^ b
+3 ^^
0: b
/a+b/ICDZ
------------------------------------------------------------------
Bra
Callout 255 0 2
a++
Callout 255 2 1
b
Callout 255 3 0
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
Options:
First char = 'a'
Need char = 'b'
ab
--->ab
+0 ^ a+
+2 ^^ b
+3 ^ ^
0: ab
aaaab
--->aaaab
+0 ^ a+
+2 ^ ^ b
+3 ^ ^
0: aaaab
aaaacb
--->aaaacb
+0 ^ a+
+2 ^ ^ b
+0 ^ a+
+2 ^ ^ b
+0 ^ a+
+2 ^ ^ b
+0 ^ a+
+2 ^^ b
No match
/(abc|def)x/ICDZS
------------------------------------------------------------------
Bra
Callout 255 0 9
CBra 1
Callout 255 1 1
a
Callout 255 2 1
b
Callout 255 3 1
c
Callout 255 4 0
Alt
Callout 255 5 1
d
Callout 255 6 1
e
Callout 255 7 1
f
Callout 255 8 0
Ket
Callout 255 9 1
x
Callout 255 10 0
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 1
Options:
No first char
Need char = 'x'
Subject length lower bound = 4
Starting chars: a d
abcx
--->abcx
+0 ^ (abc|def)
+1 ^ a
+2 ^^ b
+3 ^ ^ c
+4 ^ ^ |
+9 ^ ^ x
+10 ^ ^
0: abcx
1: abc
defx
--->defx
+0 ^ (abc|def)
+1 ^ a
+5 ^ d
+6 ^^ e
+7 ^ ^ f
+8 ^ ^ )
+9 ^ ^ x
+10 ^ ^
0: defx
1: def
** Failers
No match
abcdefzx
--->abcdefzx
+0 ^ (abc|def)
+1 ^ a
+2 ^^ b
+3 ^ ^ c
+4 ^ ^ |
+9 ^ ^ x
+5 ^ d
+0 ^ (abc|def)
+1 ^ a
+5 ^ d
+6 ^^ e
+7 ^ ^ f
+8 ^ ^ )
+9 ^ ^ x
No match
/(abc|def)x/ICDZSS
------------------------------------------------------------------
Bra
Callout 255 0 9
CBra 1
Callout 255 1 1
a
Callout 255 2 1
b
Callout 255 3 1
c
Callout 255 4 0
Alt
Callout 255 5 1
d
Callout 255 6 1
e
Callout 255 7 1
f
Callout 255 8 0
Ket
Callout 255 9 1
x
Callout 255 10 0
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 1
Options:
No first char
Need char = 'x'
abcx
--->abcx
+0 ^ (abc|def)
+1 ^ a
+2 ^^ b
+3 ^ ^ c
+4 ^ ^ |
+9 ^ ^ x
+10 ^ ^
0: abcx
1: abc
defx
--->defx
+0 ^ (abc|def)
+1 ^ a
+5 ^ d
+6 ^^ e
+7 ^ ^ f
+8 ^ ^ )
+9 ^ ^ x
+10 ^ ^
0: defx
1: def
** Failers
No match
abcdefzx
--->abcdefzx
+0 ^ (abc|def)
+1 ^ a
+2 ^^ b
+3 ^ ^ c
+4 ^ ^ |
+9 ^ ^ x
+5 ^ d
+0 ^ (abc|def)
+1 ^ a
+5 ^ d
+0 ^ (abc|def)
+1 ^ a
+5 ^ d
+0 ^ (abc|def)
+1 ^ a
+5 ^ d
+6 ^^ e
+7 ^ ^ f
+8 ^ ^ )
+9 ^ ^ x
+0 ^ (abc|def)
+1 ^ a
+5 ^ d
+0 ^ (abc|def)
+1 ^ a
+5 ^ d
+0 ^ (abc|def)
+1 ^ a
+5 ^ d
+0 ^ (abc|def)
+1 ^ a
+5 ^ d
No match
/(ab|cd){3,4}/IC
Capturing subpattern count = 1
Options:
No first char
No need char
ababab
--->ababab
+0 ^ (ab|cd){3,4}
+1 ^ a
+2 ^^ b
+3 ^ ^ |
+1 ^ ^ a
+2 ^ ^ b
+3 ^ ^ |
+1 ^ ^ a
+2 ^ ^ b
+3 ^ ^ |
+1 ^ ^ a
+4 ^ ^ c
+12 ^ ^
0: ababab
1: ab
abcdabcd
--->abcdabcd
+0 ^ (ab|cd){3,4}
+1 ^ a
+2 ^^ b
+3 ^ ^ |
+1 ^ ^ a
+4 ^ ^ c
+5 ^ ^ d
+6 ^ ^ )
+1 ^ ^ a
+2 ^ ^ b
+3 ^ ^ |
+1 ^ ^ a
+4 ^ ^ c
+5 ^ ^ d
+6 ^ ^ )
+12 ^ ^
0: abcdabcd
1: cd
abcdcdcdcdcd
--->abcdcdcdcdcd
+0 ^ (ab|cd){3,4}
+1 ^ a
+2 ^^ b
+3 ^ ^ |
+1 ^ ^ a
+4 ^ ^ c
+5 ^ ^ d
+6 ^ ^ )
+1 ^ ^ a
+4 ^ ^ c
+5 ^ ^ d
+6 ^ ^ )
+1 ^ ^ a
+4 ^ ^ c
+5 ^ ^ d
+6 ^ ^ )
+12 ^ ^
0: abcdcdcd
1: cd
/([ab]{,4}c|xy)/ICDZS
------------------------------------------------------------------
Bra
Callout 255 0 14
CBra 1
Callout 255 1 4
[ab]
Callout 255 5 1
{
Callout 255 6 1
,
Callout 255 7 1
4
Callout 255 8 1
}
Callout 255 9 1
c
Callout 255 10 0
Alt
Callout 255 11 1
x
Callout 255 12 1
y
Callout 255 13 0
Ket
Callout 255 14 0
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 1
Options:
No first char
No need char
Subject length lower bound = 2
Starting chars: a b x
Note: that { does NOT introduce a quantifier
--->Note: that { does NOT introduce a quantifier
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+5 ^^ {
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+5 ^^ {
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+5 ^^ {
+11 ^ x
No match
/([ab]{,4}c|xy)/ICDZSS
------------------------------------------------------------------
Bra
Callout 255 0 14
CBra 1
Callout 255 1 4
[ab]
Callout 255 5 1
{
Callout 255 6 1
,
Callout 255 7 1
4
Callout 255 8 1
}
Callout 255 9 1
c
Callout 255 10 0
Alt
Callout 255 11 1
x
Callout 255 12 1
y
Callout 255 13 0
Ket
Callout 255 14 0
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 1
Options:
No first char
No need char
Note: that { does NOT introduce a quantifier
--->Note: that { does NOT introduce a quantifier
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+5 ^^ {
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+5 ^^ {
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+5 ^^ {
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+11 ^ x
+0 ^ ([ab]{,4}c|xy)
+1 ^ [ab]
+11 ^ x
No match
/([ab]{1,4}c|xy){4,5}?123/ICDZ
------------------------------------------------------------------
Bra
Callout 255 0 21
CBra 1
Callout 255 1 9
[ab]{1,4}+
Callout 255 10 1
c
Callout 255 11 0
Alt
Callout 255 12 1
x
Callout 255 13 1
y
Callout 255 14 0
Ket
CBra 1
Callout 255 1 9
[ab]{1,4}+
Callout 255 10 1
c
Callout 255 11 0
Alt
Callout 255 12 1
x
Callout 255 13 1
y
Callout 255 14 0
Ket
CBra 1
Callout 255 1 9
[ab]{1,4}+
Callout 255 10 1
c
Callout 255 11 0
Alt
Callout 255 12 1
x
Callout 255 13 1
y
Callout 255 14 0
Ket
CBra 1
Callout 255 1 9
[ab]{1,4}+
Callout 255 10 1
c
Callout 255 11 0
Alt
Callout 255 12 1
x
Callout 255 13 1
y
Callout 255 14 0
Ket
Braminzero
CBra 1
Callout 255 1 9
[ab]{1,4}+
Callout 255 10 1
c
Callout 255 11 0
Alt
Callout 255 12 1
x
Callout 255 13 1
y
Callout 255 14 0
Ket
Callout 255 21 1
1
Callout 255 22 1
2
Callout 255 23 1
3
Callout 255 24 0
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 1
Options:
No first char
Need char = '3'
aacaacaacaacaac123
--->aacaacaacaacaac123
+0 ^ ([ab]{1,4}c|xy){4,5}?
+1 ^ [ab]{1,4}
+10 ^ ^ c
+11 ^ ^ |
+1 ^ ^ [ab]{1,4}
+10 ^ ^ c
+11 ^ ^ |
+1 ^ ^ [ab]{1,4}
+10 ^ ^ c
+11 ^ ^ |
+1 ^ ^ [ab]{1,4}
+10 ^ ^ c
+11 ^ ^ |
+21 ^ ^ 1
+1 ^ ^ [ab]{1,4}
+10 ^ ^ c
+11 ^ ^ |
+21 ^ ^ 1
+22 ^ ^ 2
+23 ^ ^ 3
+24 ^ ^
0: aacaacaacaacaac123
1: aac
/\b.*/I
Capturing subpattern count = 0
Max lookbehind = 1
May match empty string
No options
No first char
No need char
ab cd\>1
0: cd
/\b.*/Is
Capturing subpattern count = 0
Max lookbehind = 1
May match empty string
Options: dotall
No first char
No need char
ab cd\>1
0: cd
/(?!.bcd).*/I
Capturing subpattern count = 0
May match empty string
No options
No first char
No need char
Xbcd12345
0: bcd12345
/abcde/I
Capturing subpattern count = 0
No options
First char = 'a'
Need char = 'e'
ab\P
Partial match: ab
abc\P
Partial match: abc
abcd\P
Partial match: abcd
abcde\P
0: abcde
the quick brown abc\P
Partial match: abc
** Failers\P
No match
the quick brown abxyz fox\P
No match
"^(0?[1-9]|[12][0-9]|3[01])/(0?[1-9]|1[012])/(20)?\d\d$"I
Capturing subpattern count = 3
Options: anchored
No first char
Need char = '/'
13/05/04\P
0: 13/05/04
1: 13
2: 05
13/5/2004\P
0: 13/5/2004
1: 13
2: 5
3: 20
02/05/09\P
0: 02/05/09
1: 02
2: 05
1\P
Partial match: 1
1/2\P
Partial match: 1/2
1/2/0\P
Partial match: 1/2/0
1/2/04\P
0: 1/2/04
1: 1
2: 2
0\P
Partial match: 0
02/\P
Partial match: 02/
02/0\P
Partial match: 02/0
02/1\P
Partial match: 02/1
** Failers\P
No match
\P
No match
123\P
No match
33/4/04\P
No match
3/13/04\P
No match
0/1/2003\P
No match
0/\P
No match
02/0/\P
No match
02/13\P
No match
/0{0,2}ABC/I
Capturing subpattern count = 0
No options
No first char
Need char = 'C'
/\d{3,}ABC/I
Capturing subpattern count = 0
No options
No first char
Need char = 'C'
/\d*ABC/I
Capturing subpattern count = 0
No options
No first char
Need char = 'C'
/[abc]+DE/I
Capturing subpattern count = 0
No options
No first char
Need char = 'E'
/[abc]?123/I
Capturing subpattern count = 0
No options
No first char
Need char = '3'
123\P
0: 123
a\P
Partial match: a
b\P
Partial match: b
c\P
Partial match: c
c12\P
Partial match: c12
c123\P
0: c123
/^(?:\d){3,5}X/I
Capturing subpattern count = 0
Options: anchored
No first char
Need char = 'X'
1\P
Partial match: 1
123\P
Partial match: 123
123X
0: 123X
1234\P
Partial match: 1234
1234X
0: 1234X
12345\P
Partial match: 12345
12345X
0: 12345X
*** Failers
No match
1X
No match
123456\P
No match
//S-KF>testsavedregex
Compiled pattern written to testsavedregex
/abc/IS>testsavedregex
Capturing subpattern count = 0
No options
First char = 'a'
Need char = 'c'
Subject length lower bound = 3
No starting char list
Compiled pattern written to testsavedregex
Study data written to testsavedregex
<testsavedregex
Compiled pattern loaded from testsavedregex
Study data loaded from testsavedregex
abc
0: abc
** Failers
No match
bca
No match
/abc/ISS>testsavedregex
Capturing subpattern count = 0
No options
First char = 'a'
Need char = 'c'
Compiled pattern written to testsavedregex
<testsavedregex
Compiled pattern loaded from testsavedregex
No study data
abc
0: abc
** Failers
No match
bca
No match
/abc/IFS>testsavedregex
Capturing subpattern count = 0
No options
First char = 'a'
Need char = 'c'
Subject length lower bound = 3
No starting char list
Compiled pattern written to testsavedregex
Study data written to testsavedregex
<testsavedregex
Compiled pattern (byte-inverted) loaded from testsavedregex
Study data loaded from testsavedregex
abc
0: abc
** Failers
No match
bca
No match
/abc/IFSS>testsavedregex
Capturing subpattern count = 0
No options
First char = 'a'
Need char = 'c'
Compiled pattern written to testsavedregex
<testsavedregex
Compiled pattern (byte-inverted) loaded from testsavedregex
No study data
abc
0: abc
** Failers
No match
bca
No match
/(a|b)/IS>testsavedregex
Capturing subpattern count = 1
No options
No first char
No need char
Subject length lower bound = 1
Starting chars: a b
Compiled pattern written to testsavedregex
Study data written to testsavedregex
<testsavedregex
Compiled pattern loaded from testsavedregex
Study data loaded from testsavedregex
abc
0: a
1: a
** Failers
0: a
1: a
def
No match
/(a|b)/ISS>testsavedregex
Capturing subpattern count = 1
No options
No first char
No need char
Compiled pattern written to testsavedregex
<testsavedregex
Compiled pattern loaded from testsavedregex
No study data
abc
0: a
1: a
** Failers
0: a
1: a
def
No match
/(a|b)/ISF>testsavedregex
Capturing subpattern count = 1
No options
No first char
No need char
Subject length lower bound = 1
Starting chars: a b
Compiled pattern written to testsavedregex
Study data written to testsavedregex
<testsavedregex
Compiled pattern (byte-inverted) loaded from testsavedregex
Study data loaded from testsavedregex
abc
0: a
1: a
** Failers
0: a
1: a
def
No match
/(a|b)/ISSF>testsavedregex
Capturing subpattern count = 1
No options
No first char
No need char
Compiled pattern written to testsavedregex
<testsavedregex
Compiled pattern (byte-inverted) loaded from testsavedregex
No study data
abc
0: a
1: a
** Failers
0: a
1: a
def
No match
~<(\w+)/?>(.)*</(\1)>~smgI
Capturing subpattern count = 3
Max back reference = 1
Options: multiline dotall
First char = '<'
Need char = '>'
\J1024<!DOCTYPE seite SYSTEM "http://www.lco.lineas.de/xmlCms.dtd">\n<seite>\n<dokumenteninformation>\n<seitentitel>Partner der LCO</seitentitel>\n<sprache>de</sprache>\n<seitenbeschreibung>Partner der LINEAS Consulting\nGmbH</seitenbeschreibung>\n<schluesselworte>LINEAS Consulting GmbH Hamburg\nPartnerfirmen</schluesselworte>\n<revisit>30 days</revisit>\n<robots>index,follow</robots>\n<menueinformation>\n<aktiv>ja</aktiv>\n<menueposition>3</menueposition>\n<menuetext>Partner</menuetext>\n</menueinformation>\n<lastedited>\n<autor>LCO</autor>\n<firma>LINEAS Consulting</firma>\n<datum>15.10.2003</datum>\n</lastedited>\n</dokumenteninformation>\n<inhalt>\n\n<absatzueberschrift>Die Partnerfirmen der LINEAS Consulting\nGmbH</absatzueberschrift>\n\n<absatz><link ziel="http://www.ca.com/" zielfenster="_blank">\n<bild name="logo_ca.gif" rahmen="no"/></link> <link\nziel="http://www.ey.com/" zielfenster="_blank"><bild\nname="logo_euy.gif" rahmen="no"/></link>\n</absatz>\n\n<absatz><link ziel="http://www.cisco.de/" zielfenster="_blank">\n<bild name="logo_cisco.gif" rahmen="ja"/></link></absatz>\n\n<absatz><link ziel="http://www.atelion.de/"\nzielfenster="_blank"><bild\nname="logo_atelion.gif" rahmen="no"/></link>\n</absatz>\n\n<absatz><link ziel="http://www.line-information.de/"\nzielfenster="_blank">\n<bild name="logo_line_information.gif" rahmen="no"/></link>\n</absatz>\n\n<absatz><bild name="logo_aw.gif" rahmen="no"/></absatz>\n\n<absatz><link ziel="http://www.incognis.de/"\nzielfenster="_blank"><bild\nname="logo_incognis.gif" rahmen="no"/></link></absatz>\n\n<absatz><link ziel="http://www.addcraft.com/"\nzielfenster="_blank"><bild\nname="logo_addcraft.gif" rahmen="no"/></link></absatz>\n\n<absatz><link ziel="http://www.comendo.com/"\nzielfenster="_blank"><bild\nname="logo_comendo.gif" rahmen="no"/></link></absatz>\n\n</inhalt>\n</seite>
0: <seite>\x0a<dokumenteninformation>\x0a<seitentitel>Partner der LCO</seitentitel>\x0a<sprache>de</sprache>\x0a<seitenbeschreibung>Partner der LINEAS Consulting\x0aGmbH</seitenbeschreibung>\x0a<schluesselworte>LINEAS Consulting GmbH Hamburg\x0aPartnerfirmen</schluesselworte>\x0a<revisit>30 days</revisit>\x0a<robots>index,follow</robots>\x0a<menueinformation>\x0a<aktiv>ja</aktiv>\x0a<menueposition>3</menueposition>\x0a<menuetext>Partner</menuetext>\x0a</menueinformation>\x0a<lastedited>\x0a<autor>LCO</autor>\x0a<firma>LINEAS Consulting</firma>\x0a<datum>15.10.2003</datum>\x0a</lastedited>\x0a</dokumenteninformation>\x0a<inhalt>\x0a\x0a<absatzueberschrift>Die Partnerfirmen der LINEAS Consulting\x0aGmbH</absatzueberschrift>\x0a\x0a<absatz><link ziel="http://www.ca.com/" zielfenster="_blank">\x0a<bild name="logo_ca.gif" rahmen="no"/></link> <link\x0aziel="http://www.ey.com/" zielfenster="_blank"><bild\x0aname="logo_euy.gif" rahmen="no"/></link>\x0a</absatz>\x0a\x0a<absatz><link ziel="http://www.cisco.de/" zielfenster="_blank">\x0a<bild name="logo_cisco.gif" rahmen="ja"/></link></absatz>\x0a\x0a<absatz><link ziel="http://www.atelion.de/"\x0azielfenster="_blank"><bild\x0aname="logo_atelion.gif" rahmen="no"/></link>\x0a</absatz>\x0a\x0a<absatz><link ziel="http://www.line-information.de/"\x0azielfenster="_blank">\x0a<bild name="logo_line_information.gif" rahmen="no"/></link>\x0a</absatz>\x0a\x0a<absatz><bild name="logo_aw.gif" rahmen="no"/></absatz>\x0a\x0a<absatz><link ziel="http://www.incognis.de/"\x0azielfenster="_blank"><bild\x0aname="logo_incognis.gif" rahmen="no"/></link></absatz>\x0a\x0a<absatz><link ziel="http://www.addcraft.com/"\x0azielfenster="_blank"><bild\x0aname="logo_addcraft.gif" rahmen="no"/></link></absatz>\x0a\x0a<absatz><link ziel="http://www.comendo.com/"\x0azielfenster="_blank"><bild\x0aname="logo_comendo.gif" rahmen="no"/></link></absatz>\x0a\x0a</inhalt>\x0a</seite>
1: seite
2: \x0a
3: seite
/^a/IF
Capturing subpattern count = 0
Options: anchored
No first char
No need char
/line\nbreak/I
Capturing subpattern count = 0
Contains explicit CR or LF match
No options
First char = 'l'
Need char = 'k'
this is a line\nbreak
0: line\x0abreak
line one\nthis is a line\nbreak in the second line
0: line\x0abreak
/line\nbreak/If
Capturing subpattern count = 0
Contains explicit CR or LF match
Options: firstline
First char = 'l'
Need char = 'k'
this is a line\nbreak
0: line\x0abreak
** Failers
No match
line one\nthis is a line\nbreak in the second line
No match
/line\nbreak/Imf
Capturing subpattern count = 0
Contains explicit CR or LF match
Options: multiline firstline
First char = 'l'
Need char = 'k'
this is a line\nbreak
0: line\x0abreak
** Failers
No match
line one\nthis is a line\nbreak in the second line
No match
/(?i)(?-i)AbCd/I
Capturing subpattern count = 0
No options
First char = 'A'
Need char = 'd'
AbCd
0: AbCd
** Failers
No match
abcd
No match
/a{11111111111111111111}/I
Failed: number too big in {} quantifier at offset 8
/(){64294967295}/I
Failed: number too big in {} quantifier at offset 9
/(){2,4294967295}/I
Failed: number too big in {} quantifier at offset 11
"(?i:a)(?i:b)(?i:c)(?i:d)(?i:e)(?i:f)(?i:g)(?i:h)(?i:i)(?i:j)(k)(?i:l)A\1B"I
Capturing subpattern count = 1
Max back reference = 1
No options
First char = 'a' (caseless)
Need char = 'B'
abcdefghijklAkB
0: abcdefghijklAkB
1: k
"(?P<n0>a)(?P<n1>b)(?P<n2>c)(?P<n3>d)(?P<n4>e)(?P<n5>f)(?P<n6>g)(?P<n7>h)(?P<n8>i)(?P<n9>j)(?P<n10>k)(?P<n11>l)A\11B"I
Capturing subpattern count = 12
Max back reference = 11
Named capturing subpatterns:
n0 1
n1 2
n10 11
n11 12
n2 3
n3 4
n4 5
n5 6
n6 7
n7 8
n8 9
n9 10
No options
First char = 'a'
Need char = 'B'
abcdefghijklAkB
0: abcdefghijklAkB
1: a
2: b
3: c
4: d
5: e
6: f
7: g
8: h
9: i
10: j
11: k
12: l
"(a)(b)(c)(d)(e)(f)(g)(h)(i)(j)(k)(l)A\11B"I
Capturing subpattern count = 12
Max back reference = 11
No options
First char = 'a'
Need char = 'B'
abcdefghijklAkB
0: abcdefghijklAkB
1: a
2: b
3: c
4: d
5: e
6: f
7: g
8: h
9: i
10: j
11: k
12: l
"(?P<name0>a)(?P<name1>a)(?P<name2>a)(?P<name3>a)(?P<name4>a)(?P<name5>a)(?P<name6>a)(?P<name7>a)(?P<name8>a)(?P<name9>a)(?P<name10>a)(?P<name11>a)(?P<name12>a)(?P<name13>a)(?P<name14>a)(?P<name15>a)(?P<name16>a)(?P<name17>a)(?P<name18>a)(?P<name19>a)(?P<name20>a)(?P<name21>a)(?P<name22>a)(?P<name23>a)(?P<name24>a)(?P<name25>a)(?P<name26>a)(?P<name27>a)(?P<name28>a)(?P<name29>a)(?P<name30>a)(?P<name31>a)(?P<name32>a)(?P<name33>a)(?P<name34>a)(?P<name35>a)(?P<name36>a)(?P<name37>a)(?P<name38>a)(?P<name39>a)(?P<name40>a)(?P<name41>a)(?P<name42>a)(?P<name43>a)(?P<name44>a)(?P<name45>a)(?P<name46>a)(?P<name47>a)(?P<name48>a)(?P<name49>a)(?P<name50>a)(?P<name51>a)(?P<name52>a)(?P<name53>a)(?P<name54>a)(?P<name55>a)(?P<name56>a)(?P<name57>a)(?P<name58>a)(?P<name59>a)(?P<name60>a)(?P<name61>a)(?P<name62>a)(?P<name63>a)(?P<name64>a)(?P<name65>a)(?P<name66>a)(?P<name67>a)(?P<name68>a)(?P<name69>a)(?P<name70>a)(?P<name71>a)(?P<name72>a)(?P<name73>a)(?P<name74>a)(?P<name75>a)(?P<name76>a)(?P<name77>a)(?P<name78>a)(?P<name79>a)(?P<name80>a)(?P<name81>a)(?P<name82>a)(?P<name83>a)(?P<name84>a)(?P<name85>a)(?P<name86>a)(?P<name87>a)(?P<name88>a)(?P<name89>a)(?P<name90>a)(?P<name91>a)(?P<name92>a)(?P<name93>a)(?P<name94>a)(?P<name95>a)(?P<name96>a)(?P<name97>a)(?P<name98>a)(?P<name99>a)(?P<name100>a)"I
Capturing subpattern count = 101
Named capturing subpatterns:
name0 1
name1 2
name10 11
name100 101
name11 12
name12 13
name13 14
name14 15
name15 16
name16 17
name17 18
name18 19
name19 20
name2 3
name20 21
name21 22
name22 23
name23 24
name24 25
name25 26
name26 27
name27 28
name28 29
name29 30
name3 4
name30 31
name31 32
name32 33
name33 34
name34 35
name35 36
name36 37
name37 38
name38 39
name39 40
name4 5
name40 41
name41 42
name42 43
name43 44
name44 45
name45 46
name46 47
name47 48
name48 49
name49 50
name5 6
name50 51
name51 52
name52 53
name53 54
name54 55
name55 56
name56 57
name57 58
name58 59
name59 60
name6 7
name60 61
name61 62
name62 63
name63 64
name64 65
name65 66
name66 67
name67 68
name68 69
name69 70
name7 8
name70 71
name71 72
name72 73
name73 74
name74 75
name75 76
name76 77
name77 78
name78 79
name79 80
name8 9
name80 81
name81 82
name82 83
name83 84
name84 85
name85 86
name86 87
name87 88
name88 89
name89 90
name9 10
name90 91
name91 92
name92 93
name93 94
name94 95
name95 96
name96 97
name97 98
name98 99
name99 100
No options
First char = 'a'
Need char = 'a'
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
Matched, but too many substrings
0: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
1: a
2: a
3: a
4: a
5: a
6: a
7: a
8: a
9: a
10: a
11: a
12: a
13: a
14: a
"(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)"I
Capturing subpattern count = 101
No options
First char = 'a'
Need char = 'a'
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
Matched, but too many substrings
0: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
1: a
2: a
3: a
4: a
5: a
6: a
7: a
8: a
9: a
10: a
11: a
12: a
13: a
14: a
/[^()]*(?:\((?R)\)[^()]*)*/I
Capturing subpattern count = 0
May match empty string
No options
No first char
No need char
(this(and)that
0:
(this(and)that)
0: (this(and)that)
(this(and)that)stuff
0: (this(and)that)stuff
/[^()]*(?:\((?>(?R))\)[^()]*)*/I
Capturing subpattern count = 0
May match empty string
No options
No first char
No need char
(this(and)that
0:
(this(and)that)
0: (this(and)that)
/[^()]*(?:\((?R)\))*[^()]*/I
Capturing subpattern count = 0
May match empty string
No options
No first char
No need char
(this(and)that
0:
(this(and)that)
0: (this(and)that)
/(?:\((?R)\))*[^()]*/I
Capturing subpattern count = 0
May match empty string
No options
No first char
No need char
(this(and)that
0:
(this(and)that)
0:
((this))
0: ((this))
/(?:\((?R)\))|[^()]*/I
Capturing subpattern count = 0
May match empty string
No options
No first char
No need char
(this(and)that
0:
(this(and)that)
0:
(this)
0: (this)
((this))
0: ((this))
/\x{0000ff}/I
Capturing subpattern count = 0
No options
First char = \xff
No need char
/^((?P<A>a1)|(?P<A>a2)b)/I
Failed: two named subpatterns have the same name at offset 17
/^((?P<A>a1)|(?P<A>a2)b)/IJ
Capturing subpattern count = 3
Named capturing subpatterns:
A 2
A 3
Options: anchored dupnames
No first char
No need char
a1b\CA
0: a1
1: a1
2: a1
C a1 (2) A
a2b\CA
0: a2b
1: a2b
2: <unset>
3: a2
C a2 (2) A
** Failers
No match
a1b\CZ\CA
no parentheses with name "Z"
0: a1
1: a1
2: a1
copy substring Z failed -7
C a1 (2) A
/(?|(?<a>)(?<b>)(?<a>)|(?<a>)(?<b>)(?<a>))/IJ
Capturing subpattern count = 3
Named capturing subpatterns:
a 1
a 3
b 2
May match empty string
Options: dupnames
No first char
No need char
/^(?P<A>a)(?P<A>b)/IJ
Capturing subpattern count = 2
Named capturing subpatterns:
A 1
A 2
Options: anchored dupnames
No first char
No need char
ab\CA
0: ab
1: a
2: b
C a (1) A
/^(?P<A>a)(?P<A>b)|cd/IJ
Capturing subpattern count = 2
Named capturing subpatterns:
A 1
A 2
Options: dupnames
No first char
No need char
ab\CA
0: ab
1: a
2: b
C a (1) A
cd\CA
0: cd
copy substring A failed -7
/^(?P<A>a)(?P<A>b)|cd(?P<A>ef)(?P<A>gh)/IJ
Capturing subpattern count = 4
Named capturing subpatterns:
A 1
A 2
A 3
A 4
Options: dupnames
No first char
No need char
cdefgh\CA
0: cdefgh
1: <unset>
2: <unset>
3: ef
4: gh
C ef (2) A
/^((?P<A>a1)|(?P<A>a2)b)/IJ
Capturing subpattern count = 3
Named capturing subpatterns:
A 2
A 3
Options: anchored dupnames
No first char
No need char
a1b\GA
0: a1
1: a1
2: a1
G a1 (2) A
a2b\GA
0: a2b
1: a2b
2: <unset>
3: a2
G a2 (2) A
** Failers
No match
a1b\GZ\GA
no parentheses with name "Z"
0: a1
1: a1
2: a1
get substring Z failed -7
G a1 (2) A
/^(?P<A>a)(?P<A>b)/IJ
Capturing subpattern count = 2
Named capturing subpatterns:
A 1
A 2
Options: anchored dupnames
No first char
No need char
ab\GA
0: ab
1: a
2: b
G a (1) A
/^(?P<A>a)(?P<A>b)|cd/IJ
Capturing subpattern count = 2
Named capturing subpatterns:
A 1
A 2
Options: dupnames
No first char
No need char
ab\GA
0: ab
1: a
2: b
G a (1) A
cd\GA
0: cd
get substring A failed -7
/^(?P<A>a)(?P<A>b)|cd(?P<A>ef)(?P<A>gh)/IJ
Capturing subpattern count = 4
Named capturing subpatterns:
A 1
A 2
A 3
A 4
Options: dupnames
No first char
No need char
cdefgh\GA
0: cdefgh
1: <unset>
2: <unset>
3: ef
4: gh
G ef (2) A
/(?J)^((?P<A>a1)|(?P<A>a2)b)/I
Capturing subpattern count = 3
Named capturing subpatterns:
A 2
A 3
Options: anchored
Duplicate name status changes
No first char
No need char
a1b\CA
0: a1
1: a1
2: a1
C a1 (2) A
a2b\CA
0: a2b
1: a2b
2: <unset>
3: a2
C a2 (2) A
/^(?P<A>a) (?J:(?P<B>b)(?P<B>c)) (?P<A>d)/I
Failed: two named subpatterns have the same name at offset 37
/ In this next test, J is not set at the outer level; consequently it isn't
set in the pattern's options; consequently pcre_get_named_substring() produces
a random value. /Ix
Capturing subpattern count = 1
Options: extended
First char = 'I'
Need char = 'e'
/^(?P<A>a) (?J:(?P<B>b)(?P<B>c)) (?P<C>d)/I
Capturing subpattern count = 4
Named capturing subpatterns:
A 1
B 2
B 3
C 4
Options: anchored
Duplicate name status changes
No first char
No need char
a bc d\CA\CB\CC
0: a bc d
1: a
2: b
3: c
4: d
C a (1) A
C b (1) B
C d (1) C
/^(?P<A>a)?(?(A)a|b)/I
Capturing subpattern count = 1
Max back reference = 1
Named capturing subpatterns:
A 1
Options: anchored
No first char
No need char
aabc
0: aa
1: a
bc
0: b
** Failers
No match
abc
No match
/(?:(?(ZZ)a|b)(?P<ZZ>X))+/I
Capturing subpattern count = 1
Max back reference = 1
Named capturing subpatterns:
ZZ 1
No options
No first char
Need char = 'X'
bXaX
0: bXaX
1: X
/(?:(?(2y)a|b)(X))+/I
Failed: malformed number or name after (?( at offset 7
/(?:(?(ZA)a|b)(?P<ZZ>X))+/I
Failed: reference to non-existent subpattern at offset 9
/(?:(?(ZZ)a|b)(?(ZZ)a|b)(?P<ZZ>X))+/I
Capturing subpattern count = 1
Max back reference = 1
Named capturing subpatterns:
ZZ 1
No options
No first char
Need char = 'X'
bbXaaX
0: bbXaaX
1: X
/(?:(?(ZZ)a|\(b\))\\(?P<ZZ>X))+/I
Capturing subpattern count = 1
Max back reference = 1
Named capturing subpatterns:
ZZ 1
No options
No first char
Need char = 'X'
(b)\\Xa\\X
0: (b)\Xa\X
1: X
/(?P<ABC/I
Failed: syntax error in subpattern name (missing terminator) at offset 7
/(?:(?(A)(?P=A)a|b)(?P<A>X|Y))+/I
Capturing subpattern count = 1
Max back reference = 1
Named capturing subpatterns:
A 1
No options
No first char
No need char
bXXaYYaY
0: bXXaYYaY
1: Y
bXYaXXaX
0: bX
1: X
/()()()()()()()()()(?:(?(A)(?P=A)a|b)(?P<A>X|Y))+/I
Capturing subpattern count = 10
Max back reference = 10
Named capturing subpatterns:
A 10
No options
No first char
No need char
bXXaYYaY
0: bXXaYYaY
1:
2:
3:
4:
5:
6:
7:
8:
9:
10: Y
/\s*,\s*/IS
Capturing subpattern count = 0
No options
No first char
Need char = ','
Subject length lower bound = 1
Starting chars: \x09 \x0a \x0b \x0c \x0d \x20 ,
\x0b,\x0b
0: \x0b,\x0b
\x0c,\x0d
0: \x0c,\x0d
/^abc/Im
Capturing subpattern count = 0
Options: multiline
First char at start or follows newline
Need char = 'c'
xyz\nabc
0: abc
xyz\nabc\<lf>
0: abc
xyz\r\nabc\<lf>
0: abc
xyz\rabc\<cr>
0: abc
xyz\r\nabc\<crlf>
0: abc
** Failers
No match
xyz\nabc\<cr>
No match
xyz\r\nabc\<cr>
No match
xyz\nabc\<crlf>
No match
xyz\rabc\<crlf>
No match
xyz\rabc\<lf>
No match
/abc$/Im<lf>
Capturing subpattern count = 0
Options: multiline
Forced newline sequence: LF
First char = 'a'
Need char = 'c'
xyzabc
0: abc
xyzabc\n
0: abc
xyzabc\npqr
0: abc
xyzabc\r\<cr>
0: abc
xyzabc\rpqr\<cr>
0: abc
xyzabc\r\n\<crlf>
0: abc
xyzabc\r\npqr\<crlf>
0: abc
** Failers
No match
xyzabc\r
No match
xyzabc\rpqr
No match
xyzabc\r\n
No match
xyzabc\r\npqr
No match
/^abc/Im<cr>
Capturing subpattern count = 0
Options: multiline
Forced newline sequence: CR
First char at start or follows newline
Need char = 'c'
xyz\rabcdef
0: abc
xyz\nabcdef\<lf>
0: abc
** Failers
No match
xyz\nabcdef
No match
/^abc/Im<lf>
Capturing subpattern count = 0
Options: multiline
Forced newline sequence: LF
First char at start or follows newline
Need char = 'c'
xyz\nabcdef
0: abc
xyz\rabcdef\<cr>
0: abc
** Failers
No match
xyz\rabcdef
No match
/^abc/Im<crlf>
Capturing subpattern count = 0
Options: multiline
Forced newline sequence: CRLF
First char at start or follows newline
Need char = 'c'
xyz\r\nabcdef
0: abc
xyz\rabcdef\<cr>
0: abc
** Failers
No match
xyz\rabcdef
No match
/^abc/Im<bad>
Unknown modifier at: <bad>
/abc/I
Capturing subpattern count = 0
No options
First char = 'a'
Need char = 'c'
xyz\rabc\<bad>
Unknown escape sequence at: <bad>
abc
0: abc
/.*/I<lf>
Capturing subpattern count = 0
May match empty string
Options:
Forced newline sequence: LF
First char at start or follows newline
No need char
abc\ndef
0: abc
abc\rdef
0: abc\x0ddef
abc\r\ndef
0: abc\x0d
\<cr>abc\ndef
0: abc\x0adef
\<cr>abc\rdef
0: abc
\<cr>abc\r\ndef
0: abc
\<crlf>abc\ndef
0: abc\x0adef
\<crlf>abc\rdef
0: abc\x0ddef
\<crlf>abc\r\ndef
0: abc
/\w+(.)(.)?def/Is
Capturing subpattern count = 2
Options: dotall
No first char
Need char = 'f'
abc\ndef
0: abc\x0adef
1: \x0a
abc\rdef
0: abc\x0ddef
1: \x0d
abc\r\ndef
0: abc\x0d\x0adef
1: \x0d
2: \x0a
+((?:\s|//.*\\n|/[*](?:\\n|.)*?[*]/)*)+I
Capturing subpattern count = 1
May match empty string
No options
No first char
No need char
/* this is a C style comment */\M
Minimum match() limit = 120
Minimum match() recursion limit = 6
0: /* this is a C style comment */
1: /* this is a C style comment */
/(?P<B>25[0-5]|2[0-4]\d|[01]?\d?\d)(?:\.(?P>B)){3}/I
Capturing subpattern count = 1
Named capturing subpatterns:
B 1
No options
No first char
Need char = '.'
/()()()()()()()()()()()()()()()()()()()()
()()()()()()()()()()()()()()()()()()()()
()()()()()()()()()()()()()()()()()()()()
()()()()()()()()()()()()()()()()()()()()
()()()()()()()()()()()()()()()()()()()()
(.(.))/Ix
Capturing subpattern count = 102
Options: extended
No first char
No need char
XY\O400
0: XY
1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:
12:
13:
14:
15:
16:
17:
18:
19:
20:
21:
22:
23:
24:
25:
26:
27:
28:
29:
30:
31:
32:
33:
34:
35:
36:
37:
38:
39:
40:
41:
42:
43:
44:
45:
46:
47:
48:
49:
50:
51:
52:
53:
54:
55:
56:
57:
58:
59:
60:
61:
62:
63:
64:
65:
66:
67:
68:
69:
70:
71:
72:
73:
74:
75:
76:
77:
78:
79:
80:
81:
82:
83:
84:
85:
86:
87:
88:
89:
90:
91:
92:
93:
94:
95:
96:
97:
98:
99:
100:
101: XY
102: Y
/(a*b|(?i:c*(?-i)d))/IS
Capturing subpattern count = 1
No options
No first char
No need char
Subject length lower bound = 1
Starting chars: C a b c d
/()[ab]xyz/IS
Capturing subpattern count = 1
No options
No first char
Need char = 'z'
Subject length lower bound = 4
Starting chars: a b
/(|)[ab]xyz/IS
Capturing subpattern count = 1
No options
No first char
Need char = 'z'
Subject length lower bound = 4
Starting chars: a b
/(|c)[ab]xyz/IS
Capturing subpattern count = 1
No options
No first char
Need char = 'z'
Subject length lower bound = 4
Starting chars: a b c
/(|c?)[ab]xyz/IS
Capturing subpattern count = 1
No options
No first char
Need char = 'z'
Subject length lower bound = 4
Starting chars: a b c
/(d?|c?)[ab]xyz/IS
Capturing subpattern count = 1
No options
No first char
Need char = 'z'
Subject length lower bound = 4
Starting chars: a b c d
/(d?|c)[ab]xyz/IS
Capturing subpattern count = 1
No options
No first char
Need char = 'z'
Subject length lower bound = 4
Starting chars: a b c d
/^a*b\d/DZ
------------------------------------------------------------------
Bra
^
a*+
b
\d
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
Options: anchored
No first char
Need char = 'b'
/^a*+b\d/DZ
------------------------------------------------------------------
Bra
^
a*+
b
\d
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
Options: anchored
No first char
Need char = 'b'
/^a*?b\d/DZ
------------------------------------------------------------------
Bra
^
a*+
b
\d
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
Options: anchored
No first char
Need char = 'b'
/^a+A\d/DZ
------------------------------------------------------------------
Bra
^
a++
A
\d
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
Options: anchored
No first char
Need char = 'A'
aaaA5
0: aaaA5
** Failers
No match
aaaa5
No match
/^a*A\d/IiDZ
------------------------------------------------------------------
Bra
^
/i a*
/i A
\d
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
Options: anchored caseless
No first char
Need char = 'A' (caseless)
aaaA5
0: aaaA5
aaaa5
0: aaaa5
/(a*|b*)[cd]/IS
Capturing subpattern count = 1
No options
No first char
No need char
Subject length lower bound = 1
Starting chars: a b c d
/(a+|b*)[cd]/IS
Capturing subpattern count = 1
No options
No first char
No need char
Subject length lower bound = 1
Starting chars: a b c d
/(a*|b+)[cd]/IS
Capturing subpattern count = 1
No options
No first char
No need char
Subject length lower bound = 1
Starting chars: a b c d
/(a+|b+)[cd]/IS
Capturing subpattern count = 1
No options
No first char
No need char
Subject length lower bound = 2
Starting chars: a b
/((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((
((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((
(((
a
))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))
))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))
)))
/Ix
Capturing subpattern count = 203
Options: extended
First char = 'a'
No need char
large nest
Matched, but too many substrings
0: a
1: a
2: a
3: a
4: a
5: a
6: a
7: a
8: a
9: a
10: a
11: a
12: a
13: a
14: a
/a*\d/BZ
------------------------------------------------------------------
Bra
a*+
\d
Ket
End
------------------------------------------------------------------
/a*\D/BZ
------------------------------------------------------------------
Bra
a*
\D
Ket
End
------------------------------------------------------------------
/0*\d/BZ
------------------------------------------------------------------
Bra
0*
\d
Ket
End
------------------------------------------------------------------
/0*\D/BZ
------------------------------------------------------------------
Bra
0*+
\D
Ket
End
------------------------------------------------------------------
/a*\s/BZ
------------------------------------------------------------------
Bra
a*+
\s
Ket
End
------------------------------------------------------------------
/a*\S/BZ
------------------------------------------------------------------
Bra
a*
\S
Ket
End
------------------------------------------------------------------
/ *\s/BZ
------------------------------------------------------------------
Bra
*
\s
Ket
End
------------------------------------------------------------------
/ *\S/BZ
------------------------------------------------------------------
Bra
*+
\S
Ket
End
------------------------------------------------------------------
/a*\w/BZ
------------------------------------------------------------------
Bra
a*
\w
Ket
End
------------------------------------------------------------------
/a*\W/BZ
------------------------------------------------------------------
Bra
a*+
\W
Ket
End
------------------------------------------------------------------
/=*\w/BZ
------------------------------------------------------------------
Bra
=*+
\w
Ket
End
------------------------------------------------------------------
/=*\W/BZ
------------------------------------------------------------------
Bra
=*
\W
Ket
End
------------------------------------------------------------------
/\d*a/BZ
------------------------------------------------------------------
Bra
\d*+
a
Ket
End
------------------------------------------------------------------
/\d*2/BZ
------------------------------------------------------------------
Bra
\d*
2
Ket
End
------------------------------------------------------------------
/\d*\d/BZ
------------------------------------------------------------------
Bra
\d*
\d
Ket
End
------------------------------------------------------------------
/\d*\D/BZ
------------------------------------------------------------------
Bra
\d*+
\D
Ket
End
------------------------------------------------------------------
/\d*\s/BZ
------------------------------------------------------------------
Bra
\d*+
\s
Ket
End
------------------------------------------------------------------
/\d*\S/BZ
------------------------------------------------------------------
Bra
\d*
\S
Ket
End
------------------------------------------------------------------
/\d*\w/BZ
------------------------------------------------------------------
Bra
\d*
\w
Ket
End
------------------------------------------------------------------
/\d*\W/BZ
------------------------------------------------------------------
Bra
\d*+
\W
Ket
End
------------------------------------------------------------------
/\D*a/BZ
------------------------------------------------------------------
Bra
\D*
a
Ket
End
------------------------------------------------------------------
/\D*2/BZ
------------------------------------------------------------------
Bra
\D*+
2
Ket
End
------------------------------------------------------------------
/\D*\d/BZ
------------------------------------------------------------------
Bra
\D*+
\d
Ket
End
------------------------------------------------------------------
/\D*\D/BZ
------------------------------------------------------------------
Bra
\D*
\D
Ket
End
------------------------------------------------------------------
/\D*\s/BZ
------------------------------------------------------------------
Bra
\D*
\s
Ket
End
------------------------------------------------------------------
/\D*\S/BZ
------------------------------------------------------------------
Bra
\D*
\S
Ket
End
------------------------------------------------------------------
/\D*\w/BZ
------------------------------------------------------------------
Bra
\D*
\w
Ket
End
------------------------------------------------------------------
/\D*\W/BZ
------------------------------------------------------------------
Bra
\D*
\W
Ket
End
------------------------------------------------------------------
/\s*a/BZ
------------------------------------------------------------------
Bra
\s*+
a
Ket
End
------------------------------------------------------------------
/\s*2/BZ
------------------------------------------------------------------
Bra
\s*+
2
Ket
End
------------------------------------------------------------------
/\s*\d/BZ
------------------------------------------------------------------
Bra
\s*+
\d
Ket
End
------------------------------------------------------------------
/\s*\D/BZ
------------------------------------------------------------------
Bra
\s*
\D
Ket
End
------------------------------------------------------------------
/\s*\s/BZ
------------------------------------------------------------------
Bra
\s*
\s
Ket
End
------------------------------------------------------------------
/\s*\S/BZ
------------------------------------------------------------------
Bra
\s*+
\S
Ket
End
------------------------------------------------------------------
/\s*\w/BZ
------------------------------------------------------------------
Bra
\s*+
\w
Ket
End
------------------------------------------------------------------
/\s*\W/BZ
------------------------------------------------------------------
Bra
\s*
\W
Ket
End
------------------------------------------------------------------
/\S*a/BZ
------------------------------------------------------------------
Bra
\S*
a
Ket
End
------------------------------------------------------------------
/\S*2/BZ
------------------------------------------------------------------
Bra
\S*
2
Ket
End
------------------------------------------------------------------
/\S*\d/BZ
------------------------------------------------------------------
Bra
\S*
\d
Ket
End
------------------------------------------------------------------
/\S*\D/BZ
------------------------------------------------------------------
Bra
\S*
\D
Ket
End
------------------------------------------------------------------
/\S*\s/BZ
------------------------------------------------------------------
Bra
\S*+
\s
Ket
End
------------------------------------------------------------------
/\S*\S/BZ
------------------------------------------------------------------
Bra
\S*
\S
Ket
End
------------------------------------------------------------------
/\S*\w/BZ
------------------------------------------------------------------
Bra
\S*
\w
Ket
End
------------------------------------------------------------------
/\S*\W/BZ
------------------------------------------------------------------
Bra
\S*
\W
Ket
End
------------------------------------------------------------------
/\w*a/BZ
------------------------------------------------------------------
Bra
\w*
a
Ket
End
------------------------------------------------------------------
/\w*2/BZ
------------------------------------------------------------------
Bra
\w*
2
Ket
End
------------------------------------------------------------------
/\w*\d/BZ
------------------------------------------------------------------
Bra
\w*
\d
Ket
End
------------------------------------------------------------------
/\w*\D/BZ
------------------------------------------------------------------
Bra
\w*
\D
Ket
End
------------------------------------------------------------------
/\w*\s/BZ
------------------------------------------------------------------
Bra
\w*+
\s
Ket
End
------------------------------------------------------------------
/\w*\S/BZ
------------------------------------------------------------------
Bra
\w*
\S
Ket
End
------------------------------------------------------------------
/\w*\w/BZ
------------------------------------------------------------------
Bra
\w*
\w
Ket
End
------------------------------------------------------------------
/\w*\W/BZ
------------------------------------------------------------------
Bra
\w*+
\W
Ket
End
------------------------------------------------------------------
/\W*a/BZ
------------------------------------------------------------------
Bra
\W*+
a
Ket
End
------------------------------------------------------------------
/\W*2/BZ
------------------------------------------------------------------
Bra
\W*+
2
Ket
End
------------------------------------------------------------------
/\W*\d/BZ
------------------------------------------------------------------
Bra
\W*+
\d
Ket
End
------------------------------------------------------------------
/\W*\D/BZ
------------------------------------------------------------------
Bra
\W*
\D
Ket
End
------------------------------------------------------------------
/\W*\s/BZ
------------------------------------------------------------------
Bra
\W*
\s
Ket
End
------------------------------------------------------------------
/\W*\S/BZ
------------------------------------------------------------------
Bra
\W*
\S
Ket
End
------------------------------------------------------------------
/\W*\w/BZ
------------------------------------------------------------------
Bra
\W*+
\w
Ket
End
------------------------------------------------------------------
/\W*\W/BZ
------------------------------------------------------------------
Bra
\W*
\W
Ket
End
------------------------------------------------------------------
/[^a]+a/BZ
------------------------------------------------------------------
Bra
[^a]++
a
Ket
End
------------------------------------------------------------------
/[^a]+a/BZi
------------------------------------------------------------------
Bra
/i [^a]++
/i a
Ket
End
------------------------------------------------------------------
/[^a]+A/BZi
------------------------------------------------------------------
Bra
/i [^a]++
/i A
Ket
End
------------------------------------------------------------------
/[^a]+b/BZ
------------------------------------------------------------------
Bra
[^a]+
b
Ket
End
------------------------------------------------------------------
/[^a]+\d/BZ
------------------------------------------------------------------
Bra
[^a]+
\d
Ket
End
------------------------------------------------------------------
/a*[^a]/BZ
------------------------------------------------------------------
Bra
a*+
[^a]
Ket
End
------------------------------------------------------------------
/(?P<abc>x)(?P<xyz>y)/I
Capturing subpattern count = 2
Named capturing subpatterns:
abc 1
xyz 2
No options
First char = 'x'
Need char = 'y'
xy\Cabc\Cxyz
0: xy
1: x
2: y
C x (1) abc
C y (1) xyz
/(?<abc>x)(?'xyz'y)/I
Capturing subpattern count = 2
Named capturing subpatterns:
abc 1
xyz 2
No options
First char = 'x'
Need char = 'y'
xy\Cabc\Cxyz
0: xy
1: x
2: y
C x (1) abc
C y (1) xyz
/(?<abc'x)(?'xyz'y)/I
Failed: syntax error in subpattern name (missing terminator) at offset 6
/(?<abc>x)(?'xyz>y)/I
Failed: syntax error in subpattern name (missing terminator) at offset 15
/(?P'abc'x)(?P<xyz>y)/I
Failed: unrecognized character after (?P at offset 3
/^(?:(?(ZZ)a|b)(?<ZZ>X))+/
bXaX
0: bXaX
1: X
bXbX
0: bX
1: X
** Failers
No match
aXaX
No match
aXbX
No match
/^(?P>abc)(?<abcd>xxx)/
Failed: reference to non-existent subpattern at offset 8
/^(?P>abc)(?<abc>x|y)/
xx
0: xx
1: x
xy
0: xy
1: y
yy
0: yy
1: y
yx
0: yx
1: x
/^(?P>abc)(?P<abc>x|y)/
xx
0: xx
1: x
xy
0: xy
1: y
yy
0: yy
1: y
yx
0: yx
1: x
/^((?(abc)a|b)(?<abc>x|y))+/
bxay
0: bxay
1: ay
2: y
bxby
0: bx
1: bx
2: x
** Failers
No match
axby
No match
/^(((?P=abc)|X)(?<abc>x|y))+/
XxXxxx
0: XxXxxx
1: xx
2: x
3: x
XxXyyx
0: XxXyyx
1: yx
2: y
3: x
XxXyxx
0: XxXy
1: Xy
2: X
3: y
** Failers
No match
x
No match
/^(?1)(abc)/
abcabc
0: abcabc
1: abc
/^(?:(?:\1|X)(a|b))+/
Xaaa
0: Xaaa
1: a
Xaba
0: Xa
1: a
/^[\E\Qa\E-\Qz\E]+/BZ
------------------------------------------------------------------
Bra
^
[a-z]++
Ket
End
------------------------------------------------------------------
/^[a\Q]bc\E]/BZ
------------------------------------------------------------------
Bra
^
[\]a-c]
Ket
End
------------------------------------------------------------------
/^[a-\Q\E]/BZ
------------------------------------------------------------------
Bra
^
[\-a]
Ket
End
------------------------------------------------------------------
/^(?P>abc)[()](?<abc>)/BZ
------------------------------------------------------------------
Bra
^
Recurse
[()]
CBra 1
Ket
Ket
End
------------------------------------------------------------------
/^((?(abc)y)[()](?P<abc>x))+/BZ
------------------------------------------------------------------
Bra
^
CBra 1
Cond
2 Cond ref
y
Ket
[()]
CBra 2
x
Ket
KetRmax
Ket
End
------------------------------------------------------------------
(xy)x
0: (xy)x
1: y)x
2: x
/^(?P>abc)\Q()\E(?<abc>)/BZ
------------------------------------------------------------------
Bra
^
Recurse
()
CBra 1
Ket
Ket
End
------------------------------------------------------------------
/^(?P>abc)[a\Q(]\E(](?<abc>)/BZ
------------------------------------------------------------------
Bra
^
Recurse
[(\]a]
CBra 1
Ket
Ket
End
------------------------------------------------------------------
/^(?P>abc) # this is (a comment)
(?<abc>)/BZx
------------------------------------------------------------------
Bra
^
Recurse
CBra 1
Ket
Ket
End
------------------------------------------------------------------
/^\W*(?:(?<one>(?<two>.)\W*(?&one)\W*\k<two>|)|(?<three>(?<four>.)\W*(?&three)\W*\k'four'|\W*.\W*))\W*$/Ii
Capturing subpattern count = 4
Max back reference = 4
Named capturing subpatterns:
four 4
one 1
three 3
two 2
May match empty string
Options: anchored caseless
No first char
No need char
1221
0: 1221
1: 1221
2: 1
Satan, oscillate my metallic sonatas!
0: Satan, oscillate my metallic sonatas!
1: <unset>
2: <unset>
3: Satan, oscillate my metallic sonatas
4: S
A man, a plan, a canal: Panama!
0: A man, a plan, a canal: Panama!
1: <unset>
2: <unset>
3: A man, a plan, a canal: Panama
4: A
Able was I ere I saw Elba.
0: Able was I ere I saw Elba.
1: <unset>
2: <unset>
3: Able was I ere I saw Elba
4: A
*** Failers
No match
The quick brown fox
No match
/(?=(\w+))\1:/I
Capturing subpattern count = 1
Max back reference = 1
No options
No first char
Need char = ':'
abcd:
0: abcd:
1: abcd
/(?=(?'abc'\w+))\k<abc>:/I
Capturing subpattern count = 1
Max back reference = 1
Named capturing subpatterns:
abc 1
No options
No first char
Need char = ':'
abcd:
0: abcd:
1: abcd
/(?'abc'a|b)(?<abc>d|e)\k<abc>{2}/J
adaa
0: adaa
1: a
2: d
** Failers
No match
addd
No match
adbb
No match
/(?'abc'a|b)(?<abc>d|e)(?&abc){2}/J
bdaa
0: bdaa
1: b
2: d
bdab
0: bdab
1: b
2: d
** Failers
No match
bddd
No match
/(?(<bc))/
Failed: malformed number or name after (?( at offset 6
/(?(''))/
Failed: assertion expected after (?( or (?(?C) at offset 4
/(?('R')stuff)/
Failed: reference to non-existent subpattern at offset 7
/((abc (?(R) (?(R1)1) (?(R2)2) X | (?1) (?2) (?R) ))) /x
abcabc1Xabc2XabcXabcabc
0: abcabc1Xabc2XabcX
1: abcabc1Xabc2XabcX
2: abcabc1Xabc2XabcX
/(?<A> (?'B' abc (?(R) (?(R&A)1) (?(R&B)2) X | (?1) (?2) (?R) ))) /x
abcabc1Xabc2XabcXabcabc
0: abcabc1Xabc2XabcX
1: abcabc1Xabc2XabcX
2: abcabc1Xabc2XabcX
/(?<A> (?'B' abc (?(R) (?(R&C)1) (?(R&B)2) X | (?1) (?2) (?R) ))) /x
Failed: reference to non-existent subpattern at offset 29
/^(?(DEFINE) abc | xyz ) /x
Failed: DEFINE group contains more than one branch at offset 22
/(?(DEFINE) abc) xyz/xI
Capturing subpattern count = 0
Options: extended
First char = 'x'
Need char = 'z'
/(a|)*\d/
\O0aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
No match
\O0aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa4
Matched, but too many substrings
/^a.b/<lf>
a\rb
0: a\x0db
a\nb\<cr>
0: a\x0ab
a\x85b\<anycrlf>
0: a\x85b
** Failers
No match
a\nb
No match
a\nb\<any>
No match
a\rb\<cr>
No match
a\rb\<any>
No match
a\x85b\<any>
No match
a\rb\<anycrlf>
No match
/^abc./mgx<any>
abc1 \x0aabc2 \x0babc3xx \x0cabc4 \x0dabc5xx \x0d\x0aabc6 \x85abc7 JUNK
0: abc1
0: abc2
0: abc3
0: abc4
0: abc5
0: abc6
0: abc7
/abc.$/mgx<any>
abc1\x0a abc2\x0b abc3\x0c abc4\x0d abc5\x0d\x0a abc6\x85 abc7 abc9
0: abc1
0: abc2
0: abc3
0: abc4
0: abc5
0: abc6
0: abc9
/a/<cr><any>
/a/<any><crlf>
Failed: inconsistent NEWLINE options at offset 0
/^a\Rb/<bsr_unicode>
a\nb
0: a\x0ab
a\rb
0: a\x0db
a\r\nb
0: a\x0d\x0ab
a\x0bb
0: a\x0bb
a\x0cb
0: a\x0cb
a\x85b
0: a\x85b
** Failers
No match
a\n\rb
No match
/^a\R*b/<bsr_unicode>
ab
0: ab
a\nb
0: a\x0ab
a\rb
0: a\x0db
a\r\nb
0: a\x0d\x0ab
a\x0bb
0: a\x0bb
a\x0cb
0: a\x0cb
a\x85b
0: a\x85b
a\n\rb
0: a\x0a\x0db
a\n\r\x85\x0cb
0: a\x0a\x0d\x85\x0cb
/^a\R+b/<bsr_unicode>
a\nb
0: a\x0ab
a\rb
0: a\x0db
a\r\nb
0: a\x0d\x0ab
a\x0bb
0: a\x0bb
a\x0cb
0: a\x0cb
a\x85b
0: a\x85b
a\n\rb
0: a\x0a\x0db
a\n\r\x85\x0cb
0: a\x0a\x0d\x85\x0cb
** Failers
No match
ab
No match
/^a\R{1,3}b/<bsr_unicode>
a\nb
0: a\x0ab
a\n\rb
0: a\x0a\x0db
a\n\r\x85b
0: a\x0a\x0d\x85b
a\r\n\r\nb
0: a\x0d\x0a\x0d\x0ab
a\r\n\r\n\r\nb
0: a\x0d\x0a\x0d\x0a\x0d\x0ab
a\n\r\n\rb
0: a\x0a\x0d\x0a\x0db
a\n\n\r\nb
0: a\x0a\x0a\x0d\x0ab
** Failers
No match
a\n\n\n\rb
No match
a\r
No match
/^a[\R]b/<bsr_unicode>
aRb
0: aRb
** Failers
No match
a\nb
No match
/(?&abc)X(?<abc>P)/I
Capturing subpattern count = 1
Named capturing subpatterns:
abc 1
No options
No first char
Need char = 'P'
abcPXP123
0: PXP
1: P
/(?1)X(?<abc>P)/I
Capturing subpattern count = 1
Named capturing subpatterns:
abc 1
No options
No first char
Need char = 'P'
abcPXP123
0: PXP
1: P
/(?:a(?&abc)b)*(?<abc>x)/
123axbaxbaxbx456
0: axbaxbaxbx
1: x
123axbaxbaxb456
0: x
1: x
/(?:a(?&abc)b){1,5}(?<abc>x)/
123axbaxbaxbx456
0: axbaxbaxbx
1: x
/(?:a(?&abc)b){2,5}(?<abc>x)/
123axbaxbaxbx456
0: axbaxbaxbx
1: x
/(?:a(?&abc)b){2,}(?<abc>x)/
123axbaxbaxbx456
0: axbaxbaxbx
1: x
/(abc)(?i:(?1))/
defabcabcxyz
0: abcabc
1: abc
DEFabcABCXYZ
No match
/(abc)(?:(?i)(?1))/
defabcabcxyz
0: abcabc
1: abc
DEFabcABCXYZ
No match
/^(a)\g-2/
Failed: reference to non-existent subpattern at offset 7
/^(a)\g/
Failed: a numbered reference must not be zero at offset 5
/^(a)\g{0}/
Failed: a numbered reference must not be zero at offset 8
/^(a)\g{3/
Failed: \g is not followed by a braced, angle-bracketed, or quoted name/number or by a plain number at offset 8
/^(a)\g{aa}/
Failed: reference to non-existent subpattern at offset 9
/^a.b/<lf>
a\rb
0: a\x0db
*** Failers
No match
a\nb
No match
/.+foo/
afoo
0: afoo
** Failers
No match
\r\nfoo
No match
\nfoo
No match
/.+foo/<crlf>
afoo
0: afoo
\nfoo
0: \x0afoo
** Failers
No match
\r\nfoo
No match
/.+foo/<any>
afoo
0: afoo
** Failers
No match
\nfoo
No match
\r\nfoo
No match
/.+foo/s
afoo
0: afoo
\r\nfoo
0: \x0d\x0afoo
\nfoo
0: \x0afoo
/^$/mg<any>
abc\r\rxyz
0:
abc\n\rxyz
0:
** Failers
No match
abc\r\nxyz
No match
/(?m)^$/<any>g+
abc\r\n\r\n
0:
0+ \x0d\x0a
/(?m)^$|^\r\n/<any>g+
abc\r\n\r\n
0:
0+ \x0d\x0a
0: \x0d\x0a
0+
/(?m)$/<any>g+
abc\r\n\r\n
0:
0+ \x0d\x0a\x0d\x0a
0:
0+ \x0d\x0a
0:
0+
/abc.$/mgx<anycrlf>
abc1\x0a abc2\x0b abc3\x0c abc4\x0d abc5\x0d\x0a abc6\x85 abc9
0: abc1
0: abc4
0: abc5
0: abc9
/^X/m
XABC
0: X
** Failers
No match
XABC\B
No match
/(ab|c)(?-1)/BZ
------------------------------------------------------------------
Bra
CBra 1
ab
Alt
c
Ket
Recurse
Ket
End
------------------------------------------------------------------
abc
0: abc
1: ab
/xy(?+1)(abc)/BZ
------------------------------------------------------------------
Bra
xy
Recurse
CBra 1
abc
Ket
Ket
End
------------------------------------------------------------------
xyabcabc
0: xyabcabc
1: abc
** Failers
No match
xyabc
No match
/x(?-0)y/
Failed: a numbered reference must not be zero at offset 5
/x(?-1)y/
Failed: reference to non-existent subpattern at offset 5
/x(?+0)y/
Failed: a numbered reference must not be zero at offset 5
/x(?+1)y/
Failed: reference to non-existent subpattern at offset 5
/^(abc)?(?(-1)X|Y)/BZ
------------------------------------------------------------------
Bra
^
Brazero
CBra 1
abc
Ket
Cond
1 Cond ref
X
Alt
Y
Ket
Ket
End
------------------------------------------------------------------
abcX
0: abcX
1: abc
Y
0: Y
** Failers
No match
abcY
No match
/^((?(+1)X|Y)(abc))+/BZ
------------------------------------------------------------------
Bra
^
CBra 1
Cond
2 Cond ref
X
Alt
Y
Ket
CBra 2
abc
Ket
KetRmax
Ket
End
------------------------------------------------------------------
YabcXabc
0: YabcXabc
1: Xabc
2: abc
YabcXabcXabc
0: YabcXabcXabc
1: Xabc
2: abc
** Failers
No match
XabcXabc
No match
/(?(-1)a)/BZ
Failed: reference to non-existent subpattern at offset 6
/((?(-1)a))/BZ
------------------------------------------------------------------
Bra
CBra 1
Cond
1 Cond ref
a
Ket
Ket
Ket
End
------------------------------------------------------------------
/((?(-2)a))/BZ
Failed: reference to non-existent subpattern at offset 7
/^(?(+1)X|Y)(.)/BZ
------------------------------------------------------------------
Bra
^
Cond
1 Cond ref
X
Alt
Y
Ket
CBra 1
Any
Ket
Ket
End
------------------------------------------------------------------
Y!
0: Y!
1: !
/(?<A>tom|bon)-\k{A}/
tom-tom
0: tom-tom
1: tom
bon-bon
0: bon-bon
1: bon
** Failers
No match
tom-bon
No match
/\g{A/
Failed: syntax error in subpattern name (missing terminator) at offset 4
/(?|(abc)|(xyz))/BZ
------------------------------------------------------------------
Bra
Bra
CBra 1
abc
Ket
Alt
CBra 1
xyz
Ket
Ket
Ket
End
------------------------------------------------------------------
>abc<
0: abc
1: abc
>xyz<
0: xyz
1: xyz
/(x)(?|(abc)|(xyz))(x)/BZ
------------------------------------------------------------------
Bra
CBra 1
x
Ket
Bra
CBra 2
abc
Ket
Alt
CBra 2
xyz
Ket
Ket
CBra 3
x
Ket
Ket
End
------------------------------------------------------------------
xabcx
0: xabcx
1: x
2: abc
3: x
xxyzx
0: xxyzx
1: x
2: xyz
3: x
/(x)(?|(abc)(pqr)|(xyz))(x)/BZ
------------------------------------------------------------------
Bra
CBra 1
x
Ket
Bra
CBra 2
abc
Ket
CBra 3
pqr
Ket
Alt
CBra 2
xyz
Ket
Ket
CBra 4
x
Ket
Ket
End
------------------------------------------------------------------
xabcpqrx
0: xabcpqrx
1: x
2: abc
3: pqr
4: x
xxyzx
0: xxyzx
1: x
2: xyz
3: <unset>
4: x
/\H++X/BZ
------------------------------------------------------------------
Bra
\H++
X
Ket
End
------------------------------------------------------------------
** Failers
No match
XXXX
No match
/\H+\hY/BZ
------------------------------------------------------------------
Bra
\H++
\h
Y
Ket
End
------------------------------------------------------------------
XXXX Y
0: XXXX Y
/\H+ Y/BZ
------------------------------------------------------------------
Bra
\H++
Y
Ket
End
------------------------------------------------------------------
/\h+A/BZ
------------------------------------------------------------------
Bra
\h++
A
Ket
End
------------------------------------------------------------------
/\v*B/BZ
------------------------------------------------------------------
Bra
\v*+
B
Ket
End
------------------------------------------------------------------
/\V+\x0a/BZ
------------------------------------------------------------------
Bra
\V++
\x0a
Ket
End
------------------------------------------------------------------
/A+\h/BZ
------------------------------------------------------------------
Bra
A++
\h
Ket
End
------------------------------------------------------------------
/ *\H/BZ
------------------------------------------------------------------
Bra
*+
\H
Ket
End
------------------------------------------------------------------
/A*\v/BZ
------------------------------------------------------------------
Bra
A*+
\v
Ket
End
------------------------------------------------------------------
/\x0b*\V/BZ
------------------------------------------------------------------
Bra
\x0b*+
\V
Ket
End
------------------------------------------------------------------
/\d+\h/BZ
------------------------------------------------------------------
Bra
\d++
\h
Ket
End
------------------------------------------------------------------
/\d*\v/BZ
------------------------------------------------------------------
Bra
\d*+
\v
Ket
End
------------------------------------------------------------------
/S+\h\S+\v/BZ
------------------------------------------------------------------
Bra
S++
\h
\S++
\v
Ket
End
------------------------------------------------------------------
/\w{3,}\h\w+\v/BZ
------------------------------------------------------------------
Bra
\w{3}
\w*+
\h
\w++
\v
Ket
End
------------------------------------------------------------------
/\h+\d\h+\w\h+\S\h+\H/BZ
------------------------------------------------------------------
Bra
\h++
\d
\h++
\w
\h++
\S
\h++
\H
Ket
End
------------------------------------------------------------------
/\v+\d\v+\w\v+\S\v+\V/BZ
------------------------------------------------------------------
Bra
\v++
\d
\v++
\w
\v++
\S
\v++
\V
Ket
End
------------------------------------------------------------------
/\H+\h\H+\d/BZ
------------------------------------------------------------------
Bra
\H++
\h
\H+
\d
Ket
End
------------------------------------------------------------------
/\V+\v\V+\w/BZ
------------------------------------------------------------------
Bra
\V++
\v
\V+
\w
Ket
End
------------------------------------------------------------------
/\( (?: [^()]* | (?R) )* \)/x
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Failed: missing terminating ] for character class at offset 7
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Failed: missing terminating ] for character class at offset 9
/[^\E]AAA/
Failed: missing terminating ] for character class at offset 8
/[^\Q\E]AAA/
Failed: missing terminating ] for character class at offset 10
/[\E^]AAA/
Failed: missing terminating ] for character class at offset 8
/[\Q\E^]AAA/
Failed: missing terminating ] for character class at offset 10
/A(*PRUNE)B(*SKIP)C(*THEN)D(*COMMIT)E(*F)F(*FAIL)G(?!)H(*ACCEPT)I/BZ
------------------------------------------------------------------
Bra
A
*PRUNE
B
*SKIP
C
*THEN
D
*COMMIT
E
*FAIL
F
*FAIL
G
*FAIL
H
*ACCEPT
I
Ket
End
------------------------------------------------------------------
/^a+(*FAIL)/C
aaaaaa
--->aaaaaa
+0 ^ ^
+1 ^ a+
+3 ^ ^ (*FAIL)
+3 ^ ^ (*FAIL)
+3 ^ ^ (*FAIL)
+3 ^ ^ (*FAIL)
+3 ^ ^ (*FAIL)
+3 ^^ (*FAIL)
No match
/a+b?c+(*FAIL)/C
aaabccc
--->aaabccc
+0 ^ a+
+2 ^ ^ b?
+4 ^ ^ c+
+6 ^ ^ (*FAIL)
+6 ^ ^ (*FAIL)
+6 ^ ^ (*FAIL)
+0 ^ a+
+2 ^ ^ b?
+4 ^ ^ c+
+6 ^ ^ (*FAIL)
+6 ^ ^ (*FAIL)
+6 ^ ^ (*FAIL)
+0 ^ a+
+2 ^^ b?
+4 ^ ^ c+
+6 ^ ^ (*FAIL)
+6 ^ ^ (*FAIL)
+6 ^ ^ (*FAIL)
No match
/a+b?(*PRUNE)c+(*FAIL)/C
aaabccc
--->aaabccc
+0 ^ a+
+2 ^ ^ b?
+4 ^ ^ (*PRUNE)
+12 ^ ^ c+
+14 ^ ^ (*FAIL)
+14 ^ ^ (*FAIL)
+14 ^ ^ (*FAIL)
+0 ^ a+
+2 ^ ^ b?
+4 ^ ^ (*PRUNE)
+12 ^ ^ c+
+14 ^ ^ (*FAIL)
+14 ^ ^ (*FAIL)
+14 ^ ^ (*FAIL)
+0 ^ a+
+2 ^^ b?
+4 ^ ^ (*PRUNE)
+12 ^ ^ c+
+14 ^ ^ (*FAIL)
+14 ^ ^ (*FAIL)
+14 ^ ^ (*FAIL)
No match
/a+b?(*COMMIT)c+(*FAIL)/C
aaabccc
--->aaabccc
+0 ^ a+
+2 ^ ^ b?
+4 ^ ^ (*COMMIT)
+13 ^ ^ c+
+15 ^ ^ (*FAIL)
+15 ^ ^ (*FAIL)
+15 ^ ^ (*FAIL)
No match
/a+b?(*SKIP)c+(*FAIL)/C
aaabcccaaabccc
--->aaabcccaaabccc
+0 ^ a+
+2 ^ ^ b?
+4 ^ ^ (*SKIP)
+11 ^ ^ c+
+13 ^ ^ (*FAIL)
+13 ^ ^ (*FAIL)
+13 ^ ^ (*FAIL)
+0 ^ a+
+2 ^ ^ b?
+4 ^ ^ (*SKIP)
+11 ^ ^ c+
+13 ^ ^ (*FAIL)
+13 ^ ^ (*FAIL)
+13 ^ ^ (*FAIL)
No match
/a+b?(*THEN)c+(*FAIL)/C
aaabccc
--->aaabccc
+0 ^ a+
+2 ^ ^ b?
+4 ^ ^ (*THEN)
+11 ^ ^ c+
+13 ^ ^ (*FAIL)
+13 ^ ^ (*FAIL)
+13 ^ ^ (*FAIL)
+0 ^ a+
+2 ^ ^ b?
+4 ^ ^ (*THEN)
+11 ^ ^ c+
+13 ^ ^ (*FAIL)
+13 ^ ^ (*FAIL)
+13 ^ ^ (*FAIL)
+0 ^ a+
+2 ^^ b?
+4 ^ ^ (*THEN)
+11 ^ ^ c+
+13 ^ ^ (*FAIL)
+13 ^ ^ (*FAIL)
+13 ^ ^ (*FAIL)
No match
/a(*MARK)b/
Failed: (*MARK) must have an argument at offset 7
/(?i:A{1,}\6666666666)/
Failed: number is too big at offset 19
/\g6666666666/
Failed: number is too big at offset 11
/[\g6666666666]/BZ
------------------------------------------------------------------
Bra
[6g]
Ket
End
------------------------------------------------------------------
/(?1)\c[/
Failed: reference to non-existent subpattern at offset 3
/.+A/<crlf>
\r\nA
No match
/\nA/<crlf>
\r\nA
0: \x0aA
/[\r\n]A/<crlf>
\r\nA
0: \x0aA
/(\r|\n)A/<crlf>
\r\nA
0: \x0aA
1: \x0a
/a(*CR)b/
Failed: (*VERB) not recognized or malformed at offset 5
/(*CR)a.b/
a\nb
0: a\x0ab
** Failers
No match
a\rb
No match
/(*CR)a.b/<lf>
a\nb
0: a\x0ab
** Failers
No match
a\rb
No match
/(*LF)a.b/<CRLF>
a\rb
0: a\x0db
** Failers
No match
a\nb
No match
/(*CRLF)a.b/
a\rb
0: a\x0db
a\nb
0: a\x0ab
** Failers
No match
a\r\nb
No match
/(*ANYCRLF)a.b/<CR>
** Failers
No match
a\rb
No match
a\nb
No match
a\r\nb
No match
/(*ANY)a.b/<cr>
** Failers
No match
a\rb
No match
a\nb
No match
a\r\nb
No match
a\x85b
No match
/(*ANY).*/g
abc\r\ndef
0: abc
0:
0: def
0:
/(*ANYCRLF).*/g
abc\r\ndef
0: abc
0:
0: def
0:
/(*CRLF).*/g
abc\r\ndef
0: abc
0:
0: def
0:
/a\Rb/I<bsr_anycrlf>
Capturing subpattern count = 0
Options: bsr_anycrlf
First char = 'a'
Need char = 'b'
a\rb
0: a\x0db
a\nb
0: a\x0ab
a\r\nb
0: a\x0d\x0ab
** Failers
No match
a\x85b
No match
a\x0bb
No match
/a\Rb/I<bsr_unicode>
Capturing subpattern count = 0
Options: bsr_unicode
First char = 'a'
Need char = 'b'
a\rb
0: a\x0db
a\nb
0: a\x0ab
a\r\nb
0: a\x0d\x0ab
a\x85b
0: a\x85b
a\x0bb
0: a\x0bb
** Failers
No match
a\x85b\<bsr_anycrlf>
No match
a\x0bb\<bsr_anycrlf>
No match
/a\R?b/I<bsr_anycrlf>
Capturing subpattern count = 0
Options: bsr_anycrlf
First char = 'a'
Need char = 'b'
a\rb
0: a\x0db
a\nb
0: a\x0ab
a\r\nb
0: a\x0d\x0ab
** Failers
No match
a\x85b
No match
a\x0bb
No match
/a\R?b/I<bsr_unicode>
Capturing subpattern count = 0
Options: bsr_unicode
First char = 'a'
Need char = 'b'
a\rb
0: a\x0db
a\nb
0: a\x0ab
a\r\nb
0: a\x0d\x0ab
a\x85b
0: a\x85b
a\x0bb
0: a\x0bb
** Failers
No match
a\x85b\<bsr_anycrlf>
No match
a\x0bb\<bsr_anycrlf>
No match
/a\R{2,4}b/I<bsr_anycrlf>
Capturing subpattern count = 0
Options: bsr_anycrlf
First char = 'a'
Need char = 'b'
a\r\n\nb
0: a\x0d\x0a\x0ab
a\n\r\rb
0: a\x0a\x0d\x0db
a\r\n\r\n\r\n\r\nb
0: a\x0d\x0a\x0d\x0a\x0d\x0a\x0d\x0ab
** Failers
No match
a\x85\85b
No match
a\x0b\0bb
No match
/a\R{2,4}b/I<bsr_unicode>
Capturing subpattern count = 0
Options: bsr_unicode
First char = 'a'
Need char = 'b'
a\r\rb
0: a\x0d\x0db
a\n\n\nb
0: a\x0a\x0a\x0ab
a\r\n\n\r\rb
0: a\x0d\x0a\x0a\x0d\x0db
a\x85\85b
No match
a\x0b\0bb
No match
** Failers
No match
a\r\r\r\r\rb
No match
a\x85\85b\<bsr_anycrlf>
No match
a\x0b\0bb\<bsr_anycrlf>
No match
/(*BSR_ANYCRLF)a\Rb/I
Capturing subpattern count = 0
Options: bsr_anycrlf
First char = 'a'
Need char = 'b'
a\nb
0: a\x0ab
a\rb
0: a\x0db
/(*BSR_UNICODE)a\Rb/I
Capturing subpattern count = 0
Options: bsr_unicode
First char = 'a'
Need char = 'b'
a\x85b
0: a\x85b
/(*BSR_ANYCRLF)(*CRLF)a\Rb/I
Capturing subpattern count = 0
Options: bsr_anycrlf
Forced newline sequence: CRLF
First char = 'a'
Need char = 'b'
a\nb
0: a\x0ab
a\rb
0: a\x0db
/(*CRLF)(*BSR_UNICODE)a\Rb/I
Capturing subpattern count = 0
Options: bsr_unicode
Forced newline sequence: CRLF
First char = 'a'
Need char = 'b'
a\x85b
0: a\x85b
/(*CRLF)(*BSR_ANYCRLF)(*CR)ab/I
Capturing subpattern count = 0
Options: bsr_anycrlf
Forced newline sequence: CR
First char = 'a'
Need char = 'b'
/(?<a>)(?&)/
Failed: subpattern name expected at offset 9
/(?<abc>)(?&a)/
Failed: reference to non-existent subpattern at offset 12
/(?<a>)(?&aaaaaaaaaaaaaaaaaaaaaaa)/
Failed: reference to non-existent subpattern at offset 32
/(?+-a)/
Failed: digit expected after (?+ at offset 3
/(?-+a)/
Failed: unrecognized character after (? or (?- at offset 3
/(?(-1))/
Failed: reference to non-existent subpattern at offset 6
/(?(+10))/
Failed: reference to non-existent subpattern at offset 7
/(?(10))/
Failed: reference to non-existent subpattern at offset 6
/(?(+2))()()/
/(?(2))()()/
/\k''/
Failed: subpattern name expected at offset 3
/\k<>/
Failed: subpattern name expected at offset 3
/\k{}/
Failed: subpattern name expected at offset 3
/\k/
Failed: \k is not followed by a braced, angle-bracketed, or quoted name at offset 1
/\kabc/
Failed: \k is not followed by a braced, angle-bracketed, or quoted name at offset 1
/(?P=)/
Failed: subpattern name expected at offset 4
/(?P>)/
Failed: subpattern name expected at offset 4
/(?!\w)(?R)/
Failed: recursive call could loop indefinitely at offset 9
/(?=\w)(?R)/
Failed: recursive call could loop indefinitely at offset 9
/(?<!\w)(?R)/
Failed: recursive call could loop indefinitely at offset 10
/(?<=\w)(?R)/
Failed: recursive call could loop indefinitely at offset 10
/[[:foo:]]/
Failed: unknown POSIX class name at offset 3
/[[:1234:]]/
Failed: unknown POSIX class name at offset 3
/[[:f\oo:]]/
Failed: unknown POSIX class name at offset 3
/[[: :]]/
Failed: unknown POSIX class name at offset 3
/[[:...:]]/
Failed: unknown POSIX class name at offset 3
/[[:l\ower:]]/
Failed: unknown POSIX class name at offset 3
/[[:abc\:]]/
Failed: unknown POSIX class name at offset 3
/[abc[:x\]pqr:]]/
Failed: unknown POSIX class name at offset 6
/[[:a\dz:]]/
Failed: unknown POSIX class name at offset 3
/(^(a|b\g<-1'c))/
Failed: \g is not followed by a braced, angle-bracketed, or quoted name/number or by a plain number at offset 8
/^(?+1)(?<a>x|y){0}z/
xzxx
0: xz
yzyy
0: yz
** Failers
No match
xxz
No match
/(\3)(\1)(a)/
cat
No match
/(\3)(\1)(a)/<JS>
cat
0: a
1:
2:
3: a
/TA]/
The ACTA] comes
0: TA]
/TA]/<JS>
Failed: ] is an invalid data character in JavaScript compatibility mode at offset 2
/(?2)[]a()b](abc)/
Failed: reference to non-existent subpattern at offset 3
/(?2)[^]a()b](abc)/
Failed: reference to non-existent subpattern at offset 3
/(?1)[]a()b](abc)/
abcbabc
0: abcbabc
1: abc
** Failers
No match
abcXabc
No match
/(?1)[^]a()b](abc)/
abcXabc
0: abcXabc
1: abc
** Failers
No match
abcbabc
No match
/(?2)[]a()b](abc)(xyz)/
xyzbabcxyz
0: xyzbabcxyz
1: abc
2: xyz
/(?&N)[]a(?<N>)](?<M>abc)/
Failed: reference to non-existent subpattern at offset 4
/(?&N)[]a(?<N>)](abc)/
Failed: reference to non-existent subpattern at offset 4
/a[]b/
Failed: missing terminating ] for character class at offset 4
/a[^]b/
Failed: missing terminating ] for character class at offset 5
/a[]b/<JS>
** Failers
No match
ab
No match
/a[]+b/<JS>
** Failers
No match
ab
No match
/a[]*+b/<JS>
** Failers
No match
ab
No match
/a[^]b/<JS>
aXb
0: aXb
a\nb
0: a\x0ab
** Failers
No match
ab
No match
/a[^]+b/<JS>
aXb
0: aXb
a\nX\nXb
0: a\x0aX\x0aXb
** Failers
No match
ab
No match
/a(?!)b/BZ
------------------------------------------------------------------
Bra
a
*FAIL
b
Ket
End
------------------------------------------------------------------
/(?!)?a/BZ
------------------------------------------------------------------
Bra
Brazero
Assert not
Ket
a
Ket
End
------------------------------------------------------------------
ab
0: a
/a(*FAIL)+b/
Failed: nothing to repeat at offset 8
/(abc|pqr|123){0}[xyz]/SI
Capturing subpattern count = 1
No options
No first char
No need char
Subject length lower bound = 1
Starting chars: x y z
/(?(?=.*b)b|^)/CI
Capturing subpattern count = 0
May match empty string
Options:
No first char
No need char
adc
--->adc
+0 ^ (?(?=.*b)b|^)
+2 ^ (?=.*b)
+5 ^ .*
+7 ^ ^ b
+7 ^ ^ b
+7 ^^ b
+7 ^ b
+11 ^ ^
+12 ^ )
+13 ^
0:
abc
--->abc
+0 ^ (?(?=.*b)b|^)
+2 ^ (?=.*b)
+5 ^ .*
+7 ^ ^ b
+7 ^ ^ b
+7 ^^ b
+8 ^ ^ )
+9 ^ b
+0 ^ (?(?=.*b)b|^)
+2 ^ (?=.*b)
+5 ^ .*
+7 ^ ^ b
+7 ^^ b
+7 ^ b
+8 ^^ )
+9 ^ b
+10 ^^ |
+13 ^^
0: b
/(?(?=b).*b|^d)/I
Capturing subpattern count = 0
No options
No first char
No need char
/(?(?=.*b).*b|^d)/I
Capturing subpattern count = 0
No options
No first char
No need char
/xyz/C
xyz
--->xyz
+0 ^ x
+1 ^^ y
+2 ^ ^ z
+3 ^ ^
0: xyz
abcxyz
--->abcxyz
+0 ^ x
+1 ^^ y
+2 ^ ^ z
+3 ^ ^
0: xyz
abcxyz\Y
--->abcxyz
+0 ^ x
+0 ^ x
+0 ^ x
+0 ^ x
+1 ^^ y
+2 ^ ^ z
+3 ^ ^
0: xyz
** Failers
No match
abc
No match
abc\Y
--->abc
+0 ^ x
+0 ^ x
+0 ^ x
+0 ^ x
No match
abcxypqr
No match
abcxypqr\Y
--->abcxypqr
+0 ^ x
+0 ^ x
+0 ^ x
+0 ^ x
+1 ^^ y
+2 ^ ^ z
+0 ^ x
+0 ^ x
+0 ^ x
+0 ^ x
+0 ^ x
No match
/(*NO_START_OPT)xyz/C
abcxyz
--->abcxyz
+15 ^ x
+15 ^ x
+15 ^ x
+15 ^ x
+16 ^^ y
+17 ^ ^ z
+18 ^ ^
0: xyz
/(*NO_AUTO_POSSESS)a+b/BZ
------------------------------------------------------------------
Bra
a+
b
Ket
End
------------------------------------------------------------------
/xyz/CY
abcxyz
--->abcxyz
+0 ^ x
+0 ^ x
+0 ^ x
+0 ^ x
+1 ^^ y
+2 ^ ^ z
+3 ^ ^
0: xyz
/^"((?(?=[a])[^"])|b)*"$/C
"ab"
--->"ab"
+0 ^ ^
+1 ^ "
+2 ^^ ((?(?=[a])[^"])|b)*
+3 ^^ (?(?=[a])[^"])
+5 ^^ (?=[a])
+8 ^^ [a]
+11 ^ ^ )
+12 ^^ [^"]
+16 ^ ^ )
+17 ^ ^ |
+3 ^ ^ (?(?=[a])[^"])
+5 ^ ^ (?=[a])
+8 ^ ^ [a]
+17 ^ ^ |
+21 ^ ^ "
+18 ^ ^ b
+19 ^ ^ )
+3 ^ ^ (?(?=[a])[^"])
+5 ^ ^ (?=[a])
+8 ^ ^ [a]
+17 ^ ^ |
+21 ^ ^ "
+22 ^ ^ $
+23 ^ ^
0: "ab"
1:
/^"((?(?=[a])[^"])|b)*"$/
"ab"
0: "ab"
1:
/^X(?5)(a)(?|(b)|(q))(c)(d)Y/
Failed: reference to non-existent subpattern at offset 5
/^X(?&N)(a)(?|(b)|(q))(c)(d)(?<N>Y)/
XYabcdY
0: XYabcdY
1: a
2: b
3: c
4: d
5: Y
/Xa{2,4}b/
X\P
Partial match: X
Xa\P
Partial match: Xa
Xaa\P
Partial match: Xaa
Xaaa\P
Partial match: Xaaa
Xaaaa\P
Partial match: Xaaaa
/Xa{2,4}?b/
X\P
Partial match: X
Xa\P
Partial match: Xa
Xaa\P
Partial match: Xaa
Xaaa\P
Partial match: Xaaa
Xaaaa\P
Partial match: Xaaaa
/Xa{2,4}+b/
X\P
Partial match: X
Xa\P
Partial match: Xa
Xaa\P
Partial match: Xaa
Xaaa\P
Partial match: Xaaa
Xaaaa\P
Partial match: Xaaaa
/X\d{2,4}b/
X\P
Partial match: X
X3\P
Partial match: X3
X33\P
Partial match: X33
X333\P
Partial match: X333
X3333\P
Partial match: X3333
/X\d{2,4}?b/
X\P
Partial match: X
X3\P
Partial match: X3
X33\P
Partial match: X33
X333\P
Partial match: X333
X3333\P
Partial match: X3333
/X\d{2,4}+b/
X\P
Partial match: X
X3\P
Partial match: X3
X33\P
Partial match: X33
X333\P
Partial match: X333
X3333\P
Partial match: X3333
/X\D{2,4}b/
X\P
Partial match: X
Xa\P
Partial match: Xa
Xaa\P
Partial match: Xaa
Xaaa\P
Partial match: Xaaa
Xaaaa\P
Partial match: Xaaaa
/X\D{2,4}?b/
X\P
Partial match: X
Xa\P
Partial match: Xa
Xaa\P
Partial match: Xaa
Xaaa\P
Partial match: Xaaa
Xaaaa\P
Partial match: Xaaaa
/X\D{2,4}+b/
X\P
Partial match: X
Xa\P
Partial match: Xa
Xaa\P
Partial match: Xaa
Xaaa\P
Partial match: Xaaa
Xaaaa\P
Partial match: Xaaaa
/X[abc]{2,4}b/
X\P
Partial match: X
Xa\P
Partial match: Xa
Xaa\P
Partial match: Xaa
Xaaa\P
Partial match: Xaaa
Xaaaa\P
Partial match: Xaaaa
/X[abc]{2,4}?b/
X\P
Partial match: X
Xa\P
Partial match: Xa
Xaa\P
Partial match: Xaa
Xaaa\P
Partial match: Xaaa
Xaaaa\P
Partial match: Xaaaa
/X[abc]{2,4}+b/
X\P
Partial match: X
Xa\P
Partial match: Xa
Xaa\P
Partial match: Xaa
Xaaa\P
Partial match: Xaaa
Xaaaa\P
Partial match: Xaaaa
/X[^a]{2,4}b/
X\P
Partial match: X
Xz\P
Partial match: Xz
Xzz\P
Partial match: Xzz
Xzzz\P
Partial match: Xzzz
Xzzzz\P
Partial match: Xzzzz
/X[^a]{2,4}?b/
X\P
Partial match: X
Xz\P
Partial match: Xz
Xzz\P
Partial match: Xzz
Xzzz\P
Partial match: Xzzz
Xzzzz\P
Partial match: Xzzzz
/X[^a]{2,4}+b/
X\P
Partial match: X
Xz\P
Partial match: Xz
Xzz\P
Partial match: Xzz
Xzzz\P
Partial match: Xzzz
Xzzzz\P
Partial match: Xzzzz
/(Y)X\1{2,4}b/
YX\P
Partial match: YX
YXY\P
Partial match: YXY
YXYY\P
Partial match: YXYY
YXYYY\P
Partial match: YXYYY
YXYYYY\P
Partial match: YXYYYY
/(Y)X\1{2,4}?b/
YX\P
Partial match: YX
YXY\P
Partial match: YXY
YXYY\P
Partial match: YXYY
YXYYY\P
Partial match: YXYYY
YXYYYY\P
Partial match: YXYYYY
/(Y)X\1{2,4}+b/
YX\P
Partial match: YX
YXY\P
Partial match: YXY
YXYY\P
Partial match: YXYY
YXYYY\P
Partial match: YXYYY
YXYYYY\P
Partial match: YXYYYY
/\++\KZ|\d+X|9+Y/
++++123999\P
Partial match: 123999
++++123999Y\P
0: 999Y
++++Z1234\P
0: Z
/Z(*F)/
Z\P
No match
ZA\P
No match
/Z(?!)/
Z\P
No match
ZA\P
No match
/dog(sbody)?/
dogs\P
0: dog
dogs\P\P
Partial match: dogs
/dog(sbody)??/
dogs\P
0: dog
dogs\P\P
0: dog
/dog|dogsbody/
dogs\P
0: dog
dogs\P\P
0: dog
/dogsbody|dog/
dogs\P
0: dog
dogs\P\P
Partial match: dogs
/\bthe cat\b/
the cat\P
0: the cat
the cat\P\P
Partial match: the cat
/abc/
abc\P
0: abc
abc\P\P
0: abc
/abc\K123/
xyzabc123pqr
0: 123
xyzabc12\P
Partial match: abc12
xyzabc12\P\P
Partial match: abc12
/(?<=abc)123/
xyzabc123pqr
0: 123
xyzabc12\P
Partial match at offset 6: abc12
xyzabc12\P\P
Partial match at offset 6: abc12
/\babc\b/
+++abc+++
0: abc
+++ab\P
Partial match at offset 3: +ab
+++ab\P\P
Partial match at offset 3: +ab
/(?&word)(?&element)(?(DEFINE)(?<element><[^m][^>]>[^<])(?<word>\w*+))/BZ
------------------------------------------------------------------
Bra
Recurse
Recurse
Cond
Cond def
CBra 1
<
[^m]
[^>]
>
[^<]
Ket
CBra 2
\w*+
Ket
Ket
Ket
End
------------------------------------------------------------------
/(?&word)(?&element)(?(DEFINE)(?<element><[^\d][^>]>[^<])(?<word>\w*+))/BZ
------------------------------------------------------------------
Bra
Recurse
Recurse
Cond
Cond def
CBra 1
<
[\x00-/:-\xff] (neg)
[^>]
>
[^<]
Ket
CBra 2
\w*+
Ket
Ket
Ket
End
------------------------------------------------------------------
/(ab)(x(y)z(cd(*ACCEPT)))pq/BZ
------------------------------------------------------------------
Bra
CBra 1
ab
Ket
CBra 2
x
CBra 3
y
Ket
z
CBra 4
cd
Close 4
Close 2
*ACCEPT
Ket
Ket
pq
Ket
End
------------------------------------------------------------------
/abc\K/+
abcdef
0:
0+ def
abcdef\N\N
0:
0+ def
xyzabcdef\N\N
0:
0+ def
** Failers
No match
abcdef\N
No match
xyzabcdef\N
No match
/^(?:(?=abc)|abc\K)/+
abcdef
0:
0+ abcdef
abcdef\N\N
0:
0+ def
** Failers
No match
abcdef\N
No match
/a?b?/+
xyz
0:
0+ xyz
xyzabc
0:
0+ xyzabc
xyzabc\N
0: ab
0+ c
xyzabc\N\N
0:
0+ yzabc
xyz\N\N
0:
0+ yz
** Failers
0:
0+ ** Failers
xyz\N
No match
/^a?b?/+
xyz
0:
0+ xyz
xyzabc
0:
0+ xyzabc
** Failers
0:
0+ ** Failers
xyzabc\N
No match
xyzabc\N\N
No match
xyz\N\N
No match
xyz\N
No match
/^(?<name>a|b\g<name>c)/
aaaa
0: a
1: a
bacxxx
0: bac
1: bac
bbaccxxx
0: bbacc
1: bbacc
bbbacccxx
0: bbbaccc
1: bbbaccc
/^(?<name>a|b\g'name'c)/
aaaa
0: a
1: a
bacxxx
0: bac
1: bac
bbaccxxx
0: bbacc
1: bbacc
bbbacccxx
0: bbbaccc
1: bbbaccc
/^(a|b\g<1>c)/
aaaa
0: a
1: a
bacxxx
0: bac
1: bac
bbaccxxx
0: bbacc
1: bbacc
bbbacccxx
0: bbbaccc
1: bbbaccc
/^(a|b\g'1'c)/
aaaa
0: a
1: a
bacxxx
0: bac
1: bac
bbaccxxx
0: bbacc
1: bbacc
bbbacccxx
0: bbbaccc
1: bbbaccc
/^(a|b\g'-1'c)/
aaaa
0: a
1: a
bacxxx
0: bac
1: bac
bbaccxxx
0: bbacc
1: bbacc
bbbacccxx
0: bbbaccc
1: bbbaccc
/(^(a|b\g<-1>c))/
aaaa
0: a
1: a
2: a
bacxxx
0: bac
1: bac
2: bac
bbaccxxx
0: bbacc
1: bbacc
2: bbacc
bbbacccxx
0: bbbaccc
1: bbbaccc
2: bbbaccc
/(?-i:\g<name>)(?i:(?<name>a))/
XaaX
0: aa
1: a
XAAX
0: AA
1: A
/(?i:\g<name>)(?-i:(?<name>a))/
XaaX
0: aa
1: a
** Failers
No match
XAAX
No match
/(?-i:\g<+1>)(?i:(a))/
XaaX
0: aa
1: a
XAAX
0: AA
1: A
/(?=(?<regex>(?#simplesyntax)\$(?<name>[a-zA-Z_\x{7f}-\x{ff}][a-zA-Z0-9_\x{7f}-\x{ff}]*)(?:\[(?<index>[a-zA-Z0-9_\x{7f}-\x{ff}]+|\$\g<name>)\]|->\g<name>(\(.*?\))?)?|(?#simple syntax withbraces)\$\{(?:\g<name>(?<indices>\[(?:\g<index>|'(?:\\.|[^'\\])*'|"(?:\g<regex>|\\.|[^"\\])*")\])?|\g<complex>|\$\{\g<complex>\})\}|(?#complexsyntax)\{(?<complex>\$(?<segment>\g<name>(\g<indices>*|\(.*?\))?)(?:->\g<segment>)*|\$\g<complex>|\$\{\g<complex>\})\}))\{/
/(?<n>a|b|c)\g<n>*/
abc
0: abc
1: a
accccbbb
0: accccbbb
1: a
/^X(?7)(a)(?|(b)|(q)(r)(s))(c)(d)(Y)/
XYabcdY
0: XYabcdY
1: a
2: b
3: <unset>
4: <unset>
5: c
6: d
7: Y
/(?<=b(?1)|zzz)(a)/
xbaax
0: a
1: a
xzzzax
0: a
1: a
/(a)(?<=b\1)/
Failed: lookbehind assertion is not fixed length at offset 10
/(a)(?<=b+(?1))/
Failed: lookbehind assertion is not fixed length at offset 13
/(a+)(?<=b(?1))/
Failed: lookbehind assertion is not fixed length at offset 14
/(a(?<=b(?1)))/
Failed: lookbehind assertion is not fixed length at offset 13
/(?<=b(?1))xyz/
Failed: reference to non-existent subpattern at offset 8
/(?<=b(?1))xyz(b+)pqrstuvew/
Failed: lookbehind assertion is not fixed length at offset 26
/(a|bc)\1/SI
Capturing subpattern count = 1
Max back reference = 1
No options
No first char
No need char
Subject length lower bound = 2
Starting chars: a b
/(a|bc)\1{2,3}/SI
Capturing subpattern count = 1
Max back reference = 1
No options
No first char
No need char
Subject length lower bound = 3
Starting chars: a b
/(a|bc)(?1)/SI
Capturing subpattern count = 1
No options
No first char
No need char
Subject length lower bound = 2
Starting chars: a b
/(a|b\1)(a|b\1)/SI
Capturing subpattern count = 2
Max back reference = 1
No options
No first char
No need char
Subject length lower bound = 2
Starting chars: a b
/(a|b\1){2}/SI
Capturing subpattern count = 1
Max back reference = 1
No options
No first char
No need char
Subject length lower bound = 2
Starting chars: a b
/(a|bbbb\1)(a|bbbb\1)/SI
Capturing subpattern count = 2
Max back reference = 1
No options
No first char
No need char
Subject length lower bound = 2
Starting chars: a b
/(a|bbbb\1){2}/SI
Capturing subpattern count = 1
Max back reference = 1
No options
No first char
No need char
Subject length lower bound = 2
Starting chars: a b
/^From +([^ ]+) +[a-zA-Z][a-zA-Z][a-zA-Z] +[a-zA-Z][a-zA-Z][a-zA-Z] +[0-9]?[0-9] +[0-9][0-9]:[0-9][0-9]/SI
Capturing subpattern count = 1
Options: anchored
No first char
Need char = ':'
Subject length lower bound = 22
No starting char list
/<tr([\w\W\s\d][^<>]{0,})><TD([\w\W\s\d][^<>]{0,})>([\d]{0,}\.)(.*)((<BR>([\w\W\s\d][^<>]{0,})|[\s]{0,}))<\/a><\/TD><TD([\w\W\s\d][^<>]{0,})>([\w\W\s\d][^<>]{0,})<\/TD><TD([\w\W\s\d][^<>]{0,})>([\w\W\s\d][^<>]{0,})<\/TD><\/TR>/isIS
Capturing subpattern count = 11
Options: caseless dotall
First char = '<'
Need char = '>'
Subject length lower bound = 47
No starting char list
"(?>.*/)foo"SI
Capturing subpattern count = 0
No options
No first char
Need char = 'o'
Subject length lower bound = 4
No starting char list
/(?(?=[^a-z]+[a-z]) \d{2}-[a-z]{3}-\d{2} | \d{2}-\d{2}-\d{2} ) /xSI
Capturing subpattern count = 0
Options: extended
No first char
Need char = '-'
Subject length lower bound = 8
No starting char list
/(?:(?:(?:(?:(?:(?:(?:(?:(?:(a|b|c))))))))))/iSI
Capturing subpattern count = 1
Options: caseless
No first char
No need char
Subject length lower bound = 1
Starting chars: A B C a b c
/(?:c|d)(?:)(?:aaaaaaaa(?:)(?:bbbbbbbb)(?:bbbbbbbb(?:))(?:bbbbbbbb(?:)(?:bbbbbbbb)))/SI
Capturing subpattern count = 0
No options
No first char
Need char = 'b'
Subject length lower bound = 41
Starting chars: c d
/<a[\s]+href[\s]*=[\s]* # find <a href=
([\"\'])? # find single or double quote
(?(1) (.*?)\1 | ([^\s]+)) # if quote found, match up to next matching
# quote, otherwise match up to next space
/isxSI
Capturing subpattern count = 3
Max back reference = 1
Options: caseless extended dotall
First char = '<'
Need char = '='
Subject length lower bound = 9
No starting char list
/^(?!:) # colon disallowed at start
(?: # start of item
(?: [0-9a-f]{1,4} | # 1-4 hex digits or
(?(1)0 | () ) ) # if null previously matched, fail; else null
: # followed by colon
){1,7} # end item; 1-7 of them required
[0-9a-f]{1,4} $ # final hex number at end of string
(?(1)|.) # check that there was an empty component
/xiIS
Capturing subpattern count = 1
Max back reference = 1
Options: anchored caseless extended
No first char
Need char = ':'
Subject length lower bound = 2
No starting char list
/(?|(?<a>A)|(?<a>B))/I
Capturing subpattern count = 1
Named capturing subpatterns:
a 1
No options
No first char
No need char
AB\Ca
0: A
1: A
C A (1) a
BA\Ca
0: B
1: B
C B (1) a
/(?|(?<a>A)|(?<b>B))/
Failed: different names for subpatterns of the same number are not allowed at offset 15
/(?:a(?<quote> (?<apostrophe>')|(?<realquote>")) |
b(?<quote> (?<apostrophe>')|(?<realquote>")) )
(?('quote')[a-z]+|[0-9]+)/JIx
Capturing subpattern count = 6
Max back reference = 1
Named capturing subpatterns:
apostrophe 2
apostrophe 5
quote 1
quote 4
realquote 3
realquote 6
Options: extended dupnames
No first char
No need char
a"aaaaa
0: a"aaaaa
1: "
2: <unset>
3: "
b"aaaaa
0: b"aaaaa
1: <unset>
2: <unset>
3: <unset>
4: "
5: <unset>
6: "
** Failers
No match
b"11111
No match
a"11111
No match
/^(?|(a)(b)(c)(?<D>d)|(?<D>e)) (?('D')X|Y)/JDZx
------------------------------------------------------------------
Bra
^
Bra
CBra 1
a
Ket
CBra 2
b
Ket
CBra 3
c
Ket
CBra 4
d
Ket
Alt
CBra 1
e
Ket
Ket
Cond
Cond ref <D>2
X
Alt
Y
Ket
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 4
Max back reference = 4
Named capturing subpatterns:
D 4
D 1
Options: anchored extended dupnames
No first char
No need char
abcdX
0: abcdX
1: a
2: b
3: c
4: d
eX
0: eX
1: e
** Failers
No match
abcdY
No match
ey
No match
/(?<A>a) (b)(c) (?<A>d (?(R&A)$ | (?4)) )/JDZx
------------------------------------------------------------------
Bra
CBra 1
a
Ket
CBra 2
b
Ket
CBra 3
c
Ket
CBra 4
d
Cond
Cond recurse <A>2
$
Alt
Recurse
Ket
Ket
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 4
Max back reference = 1
Named capturing subpatterns:
A 1
A 4
Options: extended dupnames
First char = 'a'
Need char = 'd'
abcdd
0: abcdd
1: a
2: b
3: c
4: dd
** Failers
No match
abcdde
No match
/abcd*/
xxxxabcd\P
0: abcd
xxxxabcd\P\P
Partial match: abcd
/abcd*/i
xxxxabcd\P
0: abcd
xxxxabcd\P\P
Partial match: abcd
XXXXABCD\P
0: ABCD
XXXXABCD\P\P
Partial match: ABCD
/abc\d*/
xxxxabc1\P
0: abc1
xxxxabc1\P\P
Partial match: abc1
/(a)bc\1*/
xxxxabca\P
0: abca
1: a
xxxxabca\P\P
Partial match: abca
/abc[de]*/
xxxxabcde\P
0: abcde
xxxxabcde\P\P
Partial match: abcde
/-- This is not in the Perl-compatible test because Perl seems currently to be
broken and not behaving as specified in that it *does* bumpalong after
hitting (*COMMIT). --/
/(?1)(A(*COMMIT)|B)D/
ABD
0: ABD
1: B
XABD
0: ABD
1: B
BAD
0: BAD
1: A
ABXABD
0: ABD
1: B
** Failers
No match
ABX
No match
BAXBAD
No match
/(\3)(\1)(a)/<JS>
cat
0: a
1:
2:
3: a
/(\3)(\1)(a)/SI<JS>
Capturing subpattern count = 3
Max back reference = 3
Options:
No first char
Need char = 'a'
Subject length lower bound = 1
No starting char list
cat
0: a
1:
2:
3: a
/(\3)(\1)(a)/SI
Capturing subpattern count = 3
Max back reference = 3
No options
No first char
Need char = 'a'
Subject length lower bound = 3
No starting char list
cat
No match
/i(?(DEFINE)(?<s>a))/SI
Capturing subpattern count = 1
Named capturing subpatterns:
s 1
No options
First char = 'i'
No need char
Subject length lower bound = 1
No starting char list
i
0: i
/()i(?(1)a)/SI
Capturing subpattern count = 1
Max back reference = 1
No options
No first char
Need char = 'i'
Subject length lower bound = 1
Starting chars: i
ia
0: ia
1:
/(?i)a(?-i)b|c/BZ
------------------------------------------------------------------
Bra
/i a
b
Alt
c
Ket
End
------------------------------------------------------------------
XabX
0: ab
XAbX
0: Ab
CcC
0: c
** Failers
No match
XABX
No match
/(?i)a(?s)b|c/BZ
------------------------------------------------------------------
Bra
/i ab
Alt
/i c
Ket
End
------------------------------------------------------------------
/(?i)a(?s-i)b|c/BZ
------------------------------------------------------------------
Bra
/i a
b
Alt
c
Ket
End
------------------------------------------------------------------
/^(ab(c\1)d|x){2}$/BZ
------------------------------------------------------------------
Bra
^
Once
CBra 1
ab
CBra 2
c
\1
Ket
d
Alt
x
Ket
Ket
Once
CBra 1
ab
CBra 2
c
\1
Ket
d
Alt
x
Ket
Ket
$
Ket
End
------------------------------------------------------------------
xabcxd
0: xabcxd
1: abcxd
2: cx
/^(?&t)*+(?(DEFINE)(?<t>.))$/BZ
------------------------------------------------------------------
Bra
^
Braposzero
SBraPos
Recurse
KetRpos
Cond
Cond def
CBra 1
Any
Ket
Ket
$
Ket
End
------------------------------------------------------------------
/^(?&t)*(?(DEFINE)(?<t>.))$/BZ
------------------------------------------------------------------
Bra
^
Brazero
Once
Recurse
KetRmax
Cond
Cond def
CBra 1
Any
Ket
Ket
$
Ket
End
------------------------------------------------------------------
/ -- This one is here because Perl gives the match as "b" rather than "ab". I
believe this to be a Perl bug. --/
/(?>a\Kb)z|(ab)/
ab
0: ab
1: ab
/(?P<L1>(?P<L2>0|)|(?P>L2)(?P>L1))/
Failed: recursive call could loop indefinitely at offset 31
/abc(*MARK:)pqr/
Failed: (*MARK) must have an argument at offset 10
/abc(*:)pqr/
Failed: (*MARK) must have an argument at offset 6
/abc(*FAIL:123)xyz/
Failed: an argument is not allowed for (*ACCEPT), (*FAIL), or (*COMMIT) at offset 13
/--- This should, and does, fail. In Perl, it does not, which I think is a
bug because replacing the B in the pattern by (B|D) does make it fail. ---/
/A(*COMMIT)B/+K
ACABX
No match
/--- These should be different, but in Perl they are not, which I think
is a bug in Perl. ---/
/A(*THEN)B|A(*THEN)C/K
AC
0: AC
/A(*PRUNE)B|A(*PRUNE)C/K
AC
No match
/--- Mark names can be duplicated. Perl doesn't give a mark for this one,
though PCRE does. ---/
/^A(*:A)B|^X(*:A)Y/K
** Failers
No match
XAQQ
No match, mark = A
/--- COMMIT at the start of a pattern should be the same as an anchor. Perl
optimizations defeat this. So does the PCRE optimization unless we disable it
with \Y. ---/
/(*COMMIT)ABC/
ABCDEFG
0: ABC
** Failers
No match
DEFGABC\Y
No match
/^(ab (c+(*THEN)cd) | xyz)/x
abcccd
No match
/^(ab (c+(*PRUNE)cd) | xyz)/x
abcccd
No match
/^(ab (c+(*FAIL)cd) | xyz)/x
abcccd
No match
/--- Perl gets some of these wrong ---/
/(?>.(*ACCEPT))*?5/
abcde
0: a
/(.(*ACCEPT))*?5/
abcde
0: a
1: a
/(.(*ACCEPT))5/
abcde
0: a
1: a
/(.(*ACCEPT))*5/
abcde
0: a
1: a
/A\NB./BZ
------------------------------------------------------------------
Bra
A
Any
B
Any
Ket
End
------------------------------------------------------------------
ACBD
0: ACBD
*** Failers
No match
A\nB
No match
ACB\n
No match
/A\NB./sBZ
------------------------------------------------------------------
Bra
A
Any
B
AllAny
Ket
End
------------------------------------------------------------------
ACBD
0: ACBD
ACB\n
0: ACB\x0a
*** Failers
No match
A\nB
No match
/A\NB/<crlf>
A\nB
0: A\x0aB
A\rB
0: A\x0dB
** Failers
No match
A\r\nB
No match
/\R+b/BZ
------------------------------------------------------------------
Bra
\R++
b
Ket
End
------------------------------------------------------------------
/\R+\n/BZ
------------------------------------------------------------------
Bra
\R+
\x0a
Ket
End
------------------------------------------------------------------
/\R+\d/BZ
------------------------------------------------------------------
Bra
\R++
\d
Ket
End
------------------------------------------------------------------
/\d*\R/BZ
------------------------------------------------------------------
Bra
\d*+
\R
Ket
End
------------------------------------------------------------------
/\s*\R/BZ
------------------------------------------------------------------
Bra
\s*
\R
Ket
End
------------------------------------------------------------------
\x20\x0a
0: \x0a
\x20\x0d
0: \x0d
\x20\x0d\x0a
0: \x0d\x0a
/\S*\R/BZ
------------------------------------------------------------------
Bra
\S*+
\R
Ket
End
------------------------------------------------------------------
a\x0a
0: a\x0a
/X\h*\R/BZ
------------------------------------------------------------------
Bra
X
\h*+
\R
Ket
End
------------------------------------------------------------------
X\x20\x0a
0: X \x0a
/X\H*\R/BZ
------------------------------------------------------------------
Bra
X
\H*
\R
Ket
End
------------------------------------------------------------------
X\x0d\x0a
0: X\x0d\x0a
/X\H+\R/BZ
------------------------------------------------------------------
Bra
X
\H+
\R
Ket
End
------------------------------------------------------------------
X\x0d\x0a
0: X\x0d\x0a
/X\H++\R/BZ
------------------------------------------------------------------
Bra
X
\H++
\R
Ket
End
------------------------------------------------------------------
X\x0d\x0a
No match
/(?<=abc)def/
abc\P\P
Partial match at offset 3: abc
/abc$/
abc
0: abc
abc\P
0: abc
abc\P\P
Partial match: abc
/abc$/m
abc
0: abc
abc\n
0: abc
abc\P\P
Partial match: abc
abc\n\P\P
0: abc
abc\P
0: abc
abc\n\P
0: abc
/abc\z/
abc
0: abc
abc\P
0: abc
abc\P\P
Partial match: abc
/abc\Z/
abc
0: abc
abc\P
0: abc
abc\P\P
Partial match: abc
/abc\b/
abc
0: abc
abc\P
0: abc
abc\P\P
Partial match: abc
/abc\B/
abc
No match
abc\P
Partial match: abc
abc\P\P
Partial match: abc
/.+/
abc\>0
0: abc
abc\>1
0: bc
abc\>2
0: c
abc\>3
No match
abc\>4
Error -24 (bad offset value)
abc\>-4
Error -24 (bad offset value)
/^\cģ/
Failed: \c must be followed by an ASCII character at offset 3
/(?P<abn>(?P=abn)xxx)/BZ
------------------------------------------------------------------
Bra
Once
CBra 1
\1
xxx
Ket
Ket
Ket
End
------------------------------------------------------------------
/(a\1z)/BZ
------------------------------------------------------------------
Bra
Once
CBra 1
a
\1
z
Ket
Ket
Ket
End
------------------------------------------------------------------
/(?P<abn>(?P=abn)(?<badstufxxx)/BZ
Failed: syntax error in subpattern name (missing terminator) at offset 29
/(?P<abn>(?P=axn)xxx)/BZ
Failed: reference to non-existent subpattern at offset 15
/(?P<abn>(?P=axn)xxx)(?<axn>yy)/BZ
------------------------------------------------------------------
Bra
CBra 1
\2
xxx
Ket
CBra 2
yy
Ket
Ket
End
------------------------------------------------------------------
/-- These tests are here because Perl gets the first one wrong. --/
/(\R*)(.)/s
\r\n
0: \x0d
1:
2: \x0d
\r\r\n\n\r
0: \x0d\x0d\x0a\x0a\x0d
1: \x0d\x0d\x0a\x0a
2: \x0d
\r\r\n\n\r\n
0: \x0d\x0d\x0a\x0a\x0d
1: \x0d\x0d\x0a\x0a
2: \x0d
/(\R)*(.)/s
\r\n
0: \x0d
1: <unset>
2: \x0d
\r\r\n\n\r
0: \x0d\x0d\x0a\x0a\x0d
1: \x0a
2: \x0d
\r\r\n\n\r\n
0: \x0d\x0d\x0a\x0a\x0d
1: \x0a
2: \x0d
/((?>\r\n|\n|\x0b|\f|\r|\x85)*)(.)/s
\r\n
0: \x0d
1:
2: \x0d
\r\r\n\n\r
0: \x0d\x0d\x0a\x0a\x0d
1: \x0d\x0d\x0a\x0a
2: \x0d
\r\r\n\n\r\n
0: \x0d\x0d\x0a\x0a\x0d
1: \x0d\x0d\x0a\x0a
2: \x0d
/-- --/
/^abc$/BZ
------------------------------------------------------------------
Bra
^
abc
$
Ket
End
------------------------------------------------------------------
/^abc$/BZm
------------------------------------------------------------------
Bra
/m ^
abc
/m $
Ket
End
------------------------------------------------------------------
/^(a)*+(\w)/S
aaaaX
0: aaaaX
1: a
2: X
** Failers
No match
aaaa
No match
/^(?:a)*+(\w)/S
aaaaX
0: aaaaX
1: X
** Failers
No match
aaaa
No match
/(a)++1234/SDZ
------------------------------------------------------------------
Bra
CBraPos 1
a
KetRpos
1234
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 1
No options
First char = 'a'
Need char = '4'
Subject length lower bound = 5
No starting char list
/([abc])++1234/SI
Capturing subpattern count = 1
No options
No first char
Need char = '4'
Subject length lower bound = 5
Starting chars: a b c
/(?<=(abc)+)X/
Failed: lookbehind assertion is not fixed length at offset 10
/(^ab)/I
Capturing subpattern count = 1
Options: anchored
No first char
No need char
/(^ab)++/I
Capturing subpattern count = 1
Options: anchored
No first char
No need char
/(^ab|^)+/I
Capturing subpattern count = 1
May match empty string
Options: anchored
No first char
No need char
/(^ab|^)++/I
Capturing subpattern count = 1
May match empty string
Options: anchored
No first char
No need char
/(?:^ab)/I
Capturing subpattern count = 0
Options: anchored
No first char
No need char
/(?:^ab)++/I
Capturing subpattern count = 0
Options: anchored
No first char
No need char
/(?:^ab|^)+/I
Capturing subpattern count = 0
May match empty string
Options: anchored
No first char
No need char
/(?:^ab|^)++/I
Capturing subpattern count = 0
May match empty string
Options: anchored
No first char
No need char
/(.*ab)/I
Capturing subpattern count = 1
No options
First char at start or follows newline
Need char = 'b'
/(.*ab)++/I
Capturing subpattern count = 1
No options
First char at start or follows newline
Need char = 'b'
/(.*ab|.*)+/I
Capturing subpattern count = 1
May match empty string
No options
First char at start or follows newline
No need char
/(.*ab|.*)++/I
Capturing subpattern count = 1
May match empty string
No options
First char at start or follows newline
No need char
/(?:.*ab)/I
Capturing subpattern count = 0
No options
First char at start or follows newline
Need char = 'b'
/(?:.*ab)++/I
Capturing subpattern count = 0
No options
First char at start or follows newline
Need char = 'b'
/(?:.*ab|.*)+/I
Capturing subpattern count = 0
May match empty string
No options
First char at start or follows newline
No need char
/(?:.*ab|.*)++/I
Capturing subpattern count = 0
May match empty string
No options
First char at start or follows newline
No need char
/(?=a)[bcd]/I
Capturing subpattern count = 0
No options
First char = 'a'
No need char
/((?=a))[bcd]/I
Capturing subpattern count = 1
No options
First char = 'a'
No need char
/((?=a))+[bcd]/I
Capturing subpattern count = 1
No options
First char = 'a'
No need char
/((?=a))++[bcd]/I
Capturing subpattern count = 1
No options
First char = 'a'
No need char
/(?=a+)[bcd]/iI
Capturing subpattern count = 0
Options: caseless
First char = 'a' (caseless)
No need char
/(?=a+?)[bcd]/iI
Capturing subpattern count = 0
Options: caseless
First char = 'a' (caseless)
No need char
/(?=a++)[bcd]/iI
Capturing subpattern count = 0
Options: caseless
First char = 'a' (caseless)
No need char
/(?=a{3})[bcd]/iI
Capturing subpattern count = 0
Options: caseless
First char = 'a' (caseless)
Need char = 'a' (caseless)
/(abc)\1+/S
/-- Perl doesn't get these right IMO (the 3rd is PCRE-specific) --/
/(?1)(?:(b(*ACCEPT))){0}/
b
0: b
/(?1)(?:(b(*ACCEPT))){0}c/
bc
0: bc
** Failers
No match
b
No match
/(?1)(?:((*ACCEPT))){0}c/
c
0: c
c\N
0: c
/^.*?(?(?=a)a|b(*THEN)c)/
ba
No match
/^.*?(?(?=a)a|bc)/
ba
0: ba
/^.*?(?(?=a)a(*THEN)b|c)/
ac
No match
/^.*?(?(?=a)a(*THEN)b)c/
ac
No match
/^.*?(a(*THEN)b)c/
aabc
No match
/^.*? (?1) c (?(DEFINE)(a(*THEN)b))/x
aabc
0: aabc
/^.*?(a(*THEN)b|z)c/
aabc
0: aabc
1: ab
/^.*?(z|a(*THEN)b)c/
aabc
0: aabc
1: ab
/-- --/
/-- These studied versions are here because they are not Perl-compatible; the
studying means the mark is not seen. --/
/(*MARK:A)(*SKIP:B)(C|X)/KS
C
0: C
1: C
MK: A
D
No match, mark = A
/(*:A)A+(*SKIP:A)(B|Z)/KS
AAAC
No match, mark = A
/-- --/
"(?=a*(*ACCEPT)b)c"
c
0: c
c\N
0: c
/(?1)c(?(DEFINE)((*ACCEPT)b))/
c
0: c
c\N
0: c
/(?>(*ACCEPT)b)c/
c
0:
c\N
No match
/(?:(?>(a)))+a%/++
%aa%
0: aa%
0+
1: a
1+ a%
/(a)b|ac/++SS
ac\O3
0: ac
0+
/(a)(b)x|abc/++
abc\O6
0: abc
0+
/(a)bc|(a)(b)\2/
\O3abc
Matched, but too many substrings
0: abc
\O4abc
Matched, but too many substrings
0: abc
/(?(DEFINE)(a(?2)|b)(b(?1)|a))(?:(?1)|(?2))/SI
Capturing subpattern count = 2
No options
No first char
No need char
Subject length lower bound = 1
No starting char list
/(a(?2)|b)(b(?1)|a)(?:(?1)|(?2))/SI
Capturing subpattern count = 2
No options
No first char
No need char
Subject length lower bound = 3
Starting chars: a b
/(a(?2)|b)(b(?1)|a)(?1)(?2)/SI
Capturing subpattern count = 2
No options
No first char
No need char
Subject length lower bound = 4
Starting chars: a b
/(abc)(?1)/SI
Capturing subpattern count = 1
No options
First char = 'a'
Need char = 'c'
Subject length lower bound = 6
No starting char list
/^(?>a)++/
aa\M
Minimum match() limit = 5
Minimum match() recursion limit = 2
0: aa
aaaaaaaaa\M
Minimum match() limit = 12
Minimum match() recursion limit = 2
0: aaaaaaaaa
/(a)(?1)++/
aa\M
Minimum match() limit = 7
Minimum match() recursion limit = 4
0: aa
1: a
aaaaaaaaa\M
Minimum match() limit = 21
Minimum match() recursion limit = 4
0: aaaaaaaaa
1: a
/(?:(foo)|(bar)|(baz))X/SS=
bazfooX
0: fooX
1: foo
2: <unset>
3: <unset>
foobazbarX
0: barX
1: <unset>
2: bar
3: <unset>
barfooX
0: fooX
1: foo
2: <unset>
3: <unset>
bazX
0: bazX
1: <unset>
2: <unset>
3: baz
foobarbazX
0: bazX
1: <unset>
2: <unset>
3: baz
bazfooX\O0
Matched, but too many substrings
bazfooX\O2
Matched, but too many substrings
0: fooX
bazfooX\O4
Matched, but too many substrings
0: fooX
1: <unset>
bazfooX\O6
Matched, but too many substrings
0: fooX
1: foo
2: <unset>
bazfooX\O8
Matched, but too many substrings
0: fooX
1: foo
2: <unset>
3: <unset>
bazfooX\O10
0: fooX
1: foo
2: <unset>
3: <unset>
/(?=abc){3}abc/BZ
------------------------------------------------------------------
Bra
Assert
abc
Ket
abc
Ket
End
------------------------------------------------------------------
/(?=abc)+abc/BZ
------------------------------------------------------------------
Bra
Assert
abc
Ket
abc
Ket
End
------------------------------------------------------------------
/(?=abc)++abc/BZ
------------------------------------------------------------------
Bra
Assert
abc
Ket
abc
Ket
End
------------------------------------------------------------------
/(?=abc){0}xyz/BZ
------------------------------------------------------------------
Bra
Skip zero
Assert
abc
Ket
xyz
Ket
End
------------------------------------------------------------------
/(?=(a))?./BZ
------------------------------------------------------------------
Bra
Brazero
Assert
CBra 1
a
Ket
Ket
Any
Ket
End
------------------------------------------------------------------
/(?=(a))??./BZ
------------------------------------------------------------------
Bra
Braminzero
Assert
CBra 1
a
Ket
Ket
Any
Ket
End
------------------------------------------------------------------
/^(?=(a)){0}b(?1)/BZ
------------------------------------------------------------------
Bra
^
Skip zero
Assert
CBra 1
a
Ket
Ket
b
Recurse
Ket
End
------------------------------------------------------------------
/(?(DEFINE)(a))?b(?1)/BZ
------------------------------------------------------------------
Bra
Cond
Cond def
CBra 1
a
Ket
Ket
b
Recurse
Ket
End
------------------------------------------------------------------
/^(?=(?1))?[az]([abc])d/BZ
------------------------------------------------------------------
Bra
^
Brazero
Assert
Recurse
Ket
[az]
CBra 1
[a-c]
Ket
d
Ket
End
------------------------------------------------------------------
/^(?!a){0}\w+/BZ
------------------------------------------------------------------
Bra
^
Skip zero
Assert not
a
Ket
\w++
Ket
End
------------------------------------------------------------------
/(?<=(abc))?xyz/BZ
------------------------------------------------------------------
Bra
Brazero
AssertB
Reverse
CBra 1
abc
Ket
Ket
xyz
Ket
End
------------------------------------------------------------------
/[:a[:abc]b:]/BZ
------------------------------------------------------------------
Bra
[:[a-c]
b:]
Ket
End
------------------------------------------------------------------
/((?2))((?1))/SS
abc
Error -26 (nested recursion at the same subject position)
/((?(R2)a+|(?1)b))/SS
aaaabcde
Error -26 (nested recursion at the same subject position)
/(?(R)a*(?1)|((?R))b)/SS
aaaabcde
Error -26 (nested recursion at the same subject position)
/(a+|(?R)b)/
Failed: recursive call could loop indefinitely at offset 7
/^(a(*:A)(d|e(*:B))z|aeq)/C
adz
--->adz
+0 ^ ^
+1 ^ (a(*:A)(d|e(*:B))z|aeq)
+2 ^ a
+3 ^^ (*:A)
+8 ^^ (d|e(*:B))
Latest Mark: A
+9 ^^ d
+10 ^ ^ |
+18 ^ ^ z
+19 ^ ^ |
+24 ^ ^
0: adz
1: adz
2: d
aez
--->aez
+0 ^ ^
+1 ^ (a(*:A)(d|e(*:B))z|aeq)
+2 ^ a
+3 ^^ (*:A)
+8 ^^ (d|e(*:B))
Latest Mark: A
+9 ^^ d
+11 ^^ e
+12 ^ ^ (*:B)
+17 ^ ^ )
Latest Mark: B
+18 ^ ^ z
+19 ^ ^ |
+24 ^ ^
0: aez
1: aez
2: e
aeqwerty
--->aeqwerty
+0 ^ ^
+1 ^ (a(*:A)(d|e(*:B))z|aeq)
+2 ^ a
+3 ^^ (*:A)
+8 ^^ (d|e(*:B))
Latest Mark: A
+9 ^^ d
+11 ^^ e
+12 ^ ^ (*:B)
+17 ^ ^ )
Latest Mark: B
+18 ^ ^ z
+20 ^ a
+21 ^^ e
+22 ^ ^ q
+23 ^ ^ )
+24 ^ ^
0: aeq
1: aeq
/.(*F)/
\P\Pabc
No match
/\btype\b\W*?\btext\b\W*?\bjavascript\b/IS
Capturing subpattern count = 0
Max lookbehind = 1
No options
First char = 't'
Need char = 't'
Subject length lower bound = 18
No starting char list
/\btype\b\W*?\btext\b\W*?\bjavascript\b|\burl\b\W*?\bshell:|<input\b.*?\btype\b\W*?\bimage\b|\bonkeyup\b\W*?\=/IS
Capturing subpattern count = 0
Max lookbehind = 1
No options
No first char
No need char
Subject length lower bound = 8
Starting chars: < o t u
/a(*SKIP)c|b(*ACCEPT)|/+S!I
Capturing subpattern count = 0
May match empty string
No options
No first char
No need char
Subject length lower bound = -1
No starting char list
a
0:
0+
/a(*SKIP)c|b(*ACCEPT)cd(*ACCEPT)|x/SI
Capturing subpattern count = 0
No options
No first char
No need char
Subject length lower bound = -1
Starting chars: a b x
ax
0: x
'a*(*ACCEPT)b'+
\N\N
No match
abc\N\N
0: a
0+ bc
bbb\N\N
0:
0+ bb
/(*ACCEPT)a/+I
Capturing subpattern count = 0
No options
No first char
No need char
bax
0:
0+ bax
/z(*ACCEPT)a/+I
Capturing subpattern count = 0
No options
First char = 'z'
No need char
baxzbx
0: z
0+ bx
/a(?:.)*?a/ims
\Mabbbbbbbbbbbbbbbbbbbbba
Minimum match() limit = 65
Minimum match() recursion limit = 2
0: abbbbbbbbbbbbbbbbbbbbba
/a(?:.(*THEN))*?a/ims
\Mabbbbbbbbbbbbbbbbbbbbba
Minimum match() limit = 86
Minimum match() recursion limit = 45
0: abbbbbbbbbbbbbbbbbbbbba
/a(?:.(*THEN:ABC))*?a/ims
\Mabbbbbbbbbbbbbbbbbbbbba
Minimum match() limit = 86
Minimum match() recursion limit = 45
0: abbbbbbbbbbbbbbbbbbbbba
/^(?>a+)(?>(z+))\w/BZ
------------------------------------------------------------------
Bra
^
Once_NC
a++
Ket
Once
CBra 1
z++
Ket
Ket
\w
Ket
End
------------------------------------------------------------------
aaaazzzzb
0: aaaazzzzb
1: zzzz
** Failers
No match
aazz
No match
/(.)(\1|a(?2))/
bab
0: bab
1: b
2: ab
/\1|(.)(?R)\1/
cbbbc
0: cbbbc
1: c
/(.)((?(1)c|a)|a(?2))/
baa
No match
/(?P<abn>(?P=abn)xxx)/BZ
------------------------------------------------------------------
Bra
Once
CBra 1
\1
xxx
Ket
Ket
Ket
End
------------------------------------------------------------------
/(a\1z)/BZ
------------------------------------------------------------------
Bra
Once
CBra 1
a
\1
z
Ket
Ket
Ket
End
------------------------------------------------------------------
/^(?>a+)(?>b+)(?>c+)(?>d+)(?>e+)/
\Maabbccddee
Minimum match() limit = 7
Minimum match() recursion limit = 2
0: aabbccddee
/^(?>(a+))(?>(b+))(?>(c+))(?>(d+))(?>(e+))/
\Maabbccddee
Minimum match() limit = 17
Minimum match() recursion limit = 16
0: aabbccddee
1: aa
2: bb
3: cc
4: dd
5: ee
/^(?>(a+))(?>b+)(?>(c+))(?>d+)(?>(e+))/
\Maabbccddee
Minimum match() limit = 13
Minimum match() recursion limit = 10
0: aabbccddee
1: aa
2: cc
3: ee
/^a\x41z/<JS>
aAz
0: aAz
*** Failers
No match
ax41z
No match
/^a[m\x41]z/<JS>
aAz
0: aAz
/^a\x1z/<JS>
ax1z
0: ax1z
/^a\u0041z/<JS>
aAz
0: aAz
*** Failers
No match
au0041z
No match
/^a[m\u0041]z/<JS>
aAz
0: aAz
/^a\u041z/<JS>
au041z
0: au041z
*** Failers
No match
aAz
No match
/^a\U0041z/<JS>
aU0041z
0: aU0041z
*** Failers
No match
aAz
No match
/(?(?=c)c|d)++Y/BZ
------------------------------------------------------------------
Bra
BraPos
Cond
Assert
c
Ket
c
Alt
d
Ket
KetRpos
Y
Ket
End
------------------------------------------------------------------
/(?(?=c)c|d)*+Y/BZ
------------------------------------------------------------------
Bra
Braposzero
BraPos
Cond
Assert
c
Ket
c
Alt
d
Ket
KetRpos
Y
Ket
End
------------------------------------------------------------------
/a[\NB]c/
Failed: \N is not supported in a class at offset 3
/a[B-\Nc]/
Failed: invalid range in character class at offset 5
/a[B\Nc]/
Failed: \N is not supported in a class at offset 4
/(a)(?2){0,1999}?(b)/
/(a)(?(DEFINE)(b))(?2){0,1999}?(?2)/
/--- This test, with something more complicated than individual letters, causes
different behaviour in Perl. Perhaps it disables some optimization; no tag is
passed back for the failures, whereas in PCRE there is a tag. ---/
/(A|P)(*:A)(B|P) | (X|P)(X|P)(*:B)(Y|P)/xK
AABC
0: AB
1: A
2: B
MK: A
XXYZ
0: XXY
1: <unset>
2: <unset>
3: X
4: X
5: Y
MK: B
** Failers
No match
XAQQ
No match, mark = A
XAQQXZZ
No match, mark = A
AXQQQ
No match, mark = A
AXXQQQ
No match, mark = B
/-- Perl doesn't give marks for these, though it does if the alternatives are
replaced by single letters. --/
/(b|q)(*:m)f|a(*:n)w/K
aw
0: aw
MK: n
** Failers
No match, mark = n
abc
No match, mark = m
/(q|b)(*:m)f|a(*:n)w/K
aw
0: aw
MK: n
** Failers
No match, mark = n
abc
No match, mark = m
/-- After a partial match, the behaviour is as for a failure. --/
/^a(*:X)bcde/K
abc\P
Partial match, mark=X: abc
/-- These are here because Perl doesn't return a mark, except for the first --/
/(?=(*:x))(q|)/K+
abc
0:
0+ abc
1:
MK: x
/(?=(*:x))((*:y)q|)/K+
abc
0:
0+ abc
1:
MK: x
/(?=(*:x))(?:(*:y)q|)/K+
abc
0:
0+ abc
MK: x
/(?=(*:x))(?>(*:y)q|)/K+
abc
0:
0+ abc
MK: x
/(?=a(*:x))(?!a(*:y)c)/K+
ab
0:
0+ ab
MK: x
/(?=a(*:x))(?=a(*:y)c|)/K+
ab
0:
0+ ab
MK: x
/(..)\1/
ab\P
Partial match: ab
aba\P
Partial match: aba
abab\P
0: abab
1: ab
/(..)\1/i
ab\P
Partial match: ab
abA\P
Partial match: abA
aBAb\P
0: aBAb
1: aB
/(..)\1{2,}/
ab\P
Partial match: ab
aba\P
Partial match: aba
abab\P
Partial match: abab
ababa\P
Partial match: ababa
ababab\P
0: ababab
1: ab
ababab\P\P
Partial match: ababab
abababa\P
0: ababab
1: ab
abababa\P\P
Partial match: abababa
/(..)\1{2,}/i
ab\P
Partial match: ab
aBa\P
Partial match: aBa
aBAb\P
Partial match: aBAb
AbaBA\P
Partial match: AbaBA
abABAb\P
0: abABAb
1: ab
aBAbaB\P\P
Partial match: aBAbaB
abABabA\P
0: abABab
1: ab
abaBABa\P\P
Partial match: abaBABa
/(..)\1{2,}?x/i
ab\P
Partial match: ab
abA\P
Partial match: abA
aBAb\P
Partial match: aBAb
abaBA\P
Partial match: abaBA
abAbaB\P
Partial match: abAbaB
abaBabA\P
Partial match: abaBabA
abAbABaBx\P
0: abAbABaBx
1: ab
/^(..)\1/
aba\P
Partial match: aba
/^(..)\1{2,3}x/
aba\P
Partial match: aba
ababa\P
Partial match: ababa
ababa\P\P
Partial match: ababa
abababx
0: abababx
1: ab
ababababx
0: ababababx
1: ab
/^(..)\1{2,3}?x/
aba\P
Partial match: aba
ababa\P
Partial match: ababa
ababa\P\P
Partial match: ababa
abababx
0: abababx
1: ab
ababababx
0: ababababx
1: ab
/^(..)(\1{2,3})ab/
abababab
0: abababab
1: ab
2: abab
/^\R/
\r\P
0: \x0d
\r\P\P
Partial match: \x0d
/^\R{2,3}x/
\r\P
Partial match: \x0d
\r\P\P
Partial match: \x0d
\r\r\P
Partial match: \x0d\x0d
\r\r\P\P
Partial match: \x0d\x0d
\r\r\r\P
Partial match: \x0d\x0d\x0d
\r\r\r\P\P
Partial match: \x0d\x0d\x0d
\r\rx
0: \x0d\x0dx
\r\r\rx
0: \x0d\x0d\x0dx
/^\R{2,3}?x/
\r\P
Partial match: \x0d
\r\P\P
Partial match: \x0d
\r\r\P
Partial match: \x0d\x0d
\r\r\P\P
Partial match: \x0d\x0d
\r\r\r\P
Partial match: \x0d\x0d\x0d
\r\r\r\P\P
Partial match: \x0d\x0d\x0d
\r\rx
0: \x0d\x0dx
\r\r\rx
0: \x0d\x0d\x0dx
/^\R?x/
\r\P
Partial match: \x0d
\r\P\P
Partial match: \x0d
x
0: x
\rx
0: \x0dx
/^\R+x/
\r\P
Partial match: \x0d
\r\P\P
Partial match: \x0d
\r\n\P
Partial match: \x0d\x0a
\r\n\P\P
Partial match: \x0d\x0a
\rx
0: \x0dx
/^a$/<CRLF>
a\r\P
Partial match: a\x0d
a\r\P\P
Partial match: a\x0d
/^a$/m<CRLF>
a\r\P
Partial match: a\x0d
a\r\P\P
Partial match: a\x0d
/^(a$|a\r)/<CRLF>
a\r\P
0: a\x0d
1: a\x0d
a\r\P\P
Partial match: a\x0d
/^(a$|a\r)/m<CRLF>
a\r\P
0: a\x0d
1: a\x0d
a\r\P\P
Partial match: a\x0d
/./<CRLF>
\r\P
0: \x0d
\r\P\P
Partial match: \x0d
/.{2,3}/<CRLF>
\r\P
Partial match: \x0d
\r\P\P
Partial match: \x0d
\r\r\P
0: \x0d\x0d
\r\r\P\P
Partial match: \x0d\x0d
\r\r\r\P
0: \x0d\x0d\x0d
\r\r\r\P\P
Partial match: \x0d\x0d\x0d
/.{2,3}?/<CRLF>
\r\P
Partial match: \x0d
\r\P\P
Partial match: \x0d
\r\r\P
0: \x0d\x0d
\r\r\P\P
Partial match: \x0d\x0d
\r\r\r\P
0: \x0d\x0d
\r\r\r\P\P
0: \x0d\x0d
"AB(C(D))(E(F))?(?(?=\2)(?=\4))"
ABCDGHI\O03
Matched, but too many substrings
0: ABCD
/-- These are all run as real matches in test 1; here we are just checking the
settings of the anchored and startline bits. --/
/(?>.*?a)(?<=ba)/I
Capturing subpattern count = 0
Max lookbehind = 2
No options
No first char
Need char = 'a'
/(?:.*?a)(?<=ba)/I
Capturing subpattern count = 0
Max lookbehind = 2
No options
First char at start or follows newline
Need char = 'a'
/.*?a(*PRUNE)b/I
Capturing subpattern count = 0
No options
No first char
Need char = 'b'
/.*?a(*PRUNE)b/sI
Capturing subpattern count = 0
Options: dotall
No first char
Need char = 'b'
/^a(*PRUNE)b/sI
Capturing subpattern count = 0
Options: anchored dotall
No first char
No need char
/.*?a(*SKIP)b/I
Capturing subpattern count = 0
No options
No first char
Need char = 'b'
/(?>.*?a)b/sI
Capturing subpattern count = 0
Options: dotall
No first char
Need char = 'b'
/(?>.*?a)b/I
Capturing subpattern count = 0
No options
No first char
Need char = 'b'
/(?>^a)b/sI
Capturing subpattern count = 0
Options: anchored dotall
No first char
No need char
/(?>.*?)(?<=(abcd)|(wxyz))/I
Capturing subpattern count = 2
Max lookbehind = 4
May match empty string
No options
No first char
No need char
/(?>.*)(?<=(abcd)|(wxyz))/I
Capturing subpattern count = 2
Max lookbehind = 4
May match empty string
No options
No first char
No need char
"(?>.*)foo"I
Capturing subpattern count = 0
No options
No first char
Need char = 'o'
"(?>.*?)foo"I
Capturing subpattern count = 0
No options
No first char
Need char = 'o'
/(?>^abc)/mI
Capturing subpattern count = 0
Options: multiline
First char at start or follows newline
Need char = 'c'
/(?>.*abc)/mI
Capturing subpattern count = 0
Options: multiline
No first char
Need char = 'c'
/(?:.*abc)/mI
Capturing subpattern count = 0
Options: multiline
First char at start or follows newline
Need char = 'c'
/-- Check PCRE_STUDY_EXTRA_NEEDED --/
/.?/S-I
Capturing subpattern count = 0
May match empty string
No options
No first char
No need char
Study returned NULL
/.?/S!I
Capturing subpattern count = 0
May match empty string
No options
No first char
No need char
Subject length lower bound = -1
No starting char list
/(?:(a)+(?C1)bb|aa(?C2)b)/
aab\C+
Callout 1: last capture = 1
0: <unset>
1: a
--->aab
^ ^ b
Callout 1: last capture = 1
0: <unset>
1: a
--->aab
^^ b
Callout 2: last capture = -1
0: <unset>
--->aab
^ ^ b
0: aab
/(?:(a)++(?C1)bb|aa(?C2)b)/
aab\C+
Callout 1: last capture = 1
0: <unset>
1: a
--->aab
^ ^ b
Callout 2: last capture = -1
0: <unset>
--->aab
^ ^ b
0: aab
/(?:(?>(a))(?C1)bb|aa(?C2)b)/
aab\C+
Callout 1: last capture = 1
0: <unset>
1: a
--->aab
^^ b
Callout 2: last capture = -1
0: <unset>
--->aab
^ ^ b
0: aab
/(?:(?1)(?C1)x|ab(?C2))((a)){0}/
aab\C+
Callout 1: last capture = -1
0: <unset>
--->aab
^^ x
Callout 1: last capture = -1
0: <unset>
--->aab
^^ x
Callout 2: last capture = -1
0: <unset>
--->aab
^ ^ )
0: ab
/(?1)(?C1)((a)(?C2)){0}/
aab\C+
Callout 2: last capture = 2
0: <unset>
1: <unset>
2: a
--->aab
^^ )
Callout 1: last capture = -1
0: <unset>
--->aab
^^ ((a)(?C2)){0}
0: a
/(?:(a)+(?C1)bb|aa(?C2)b)++/
aab\C+
Callout 1: last capture = 1
0: <unset>
1: a
--->aab
^ ^ b
Callout 1: last capture = 1
0: <unset>
1: a
--->aab
^^ b
Callout 2: last capture = -1
0: <unset>
--->aab
^ ^ b
0: aab
aab\C+\O2
Callout 1: last capture = 1
0: <unset>
--->aab
^ ^ b
Callout 1: last capture = 1
0: <unset>
--->aab
^^ b
Callout 2: last capture = -1
0: <unset>
--->aab
^ ^ b
0: aab
/(ab)x|ab/
ab\O3
0: ab
ab\O2
0: ab
/(ab)/
ab\O3
Matched, but too many substrings
0: ab
ab\O2
Matched, but too many substrings
0: ab
/(?<=123)(*MARK:xx)abc/K
xxxx123a\P\P
Partial match at offset 7, mark=xx: 123a
xxxx123a\P
Partial match at offset 7, mark=xx: 123a
/123\Kabc/
xxxx123a\P\P
Partial match: 123a
xxxx123a\P
Partial match: 123a
/^(?(?=a)aa|bb)/C
bb
--->bb
+0 ^ ^
+1 ^ (?(?=a)aa|bb)
+3 ^ (?=a)
+6 ^ a
+11 ^ b
+12 ^^ b
+13 ^ ^ )
+14 ^ ^
0: bb
/(?C1)^(?C2)(?(?C99)(?=(?C3)a(?C4))(?C5)a(?C6)a(?C7)|(?C8)b(?C9)b(?C10))(?C11)/
bb
--->bb
1 ^ ^
2 ^ (?(?C99)(?=(?C3)a(?C4))(?C5)a(?C6)a(?C7)|(?C8)b(?C9)b(?C10))
99 ^ (?=(?C3)a(?C4))
3 ^ a
8 ^ b
9 ^^ b
10 ^ ^ )
11 ^ ^
0: bb
/-- Perl seems to have a bug with this one --/
/aaaaa(*COMMIT)(*PRUNE)b|a+c/
aaaaaac
0: aaaac
/-- Here are some that Perl treats differently because of the way it handles
backtracking verbs. --/
/(?!a(*COMMIT)b)ac|ad/
ac
0: ac
ad
0: ad
/^(?!a(*THEN)b|ac)../
ac
No match
ad
0: ad
/^(?=a(*THEN)b|ac)/
ac
0:
/\A.*?(?:a|b(*THEN)c)/
ba
0: ba
/\A.*?(?:a|b(*THEN)c)++/
ba
0: ba
/\A.*?(?:a|b(*THEN)c|d)/
ba
0: ba
/(?:(a(*MARK:X)a+(*SKIP:X)b)){0}(?:(?1)|aac)/
aac
0: aac
/\A.*?(a|b(*THEN)c)/
ba
0: ba
1: a
/^(A(*THEN)B|A(*THEN)D)/
AD
0: AD
1: AD
/(?!b(*THEN)a)bn|bnn/
bnn
0: bn
/(?(?=b(*SKIP)a)bn|bnn)/
bnn
No match
/(?=b(*THEN)a|)bn|bnn/
bnn
0: bn
/-------------------------/
/(*LIMIT_MATCH=12bc)abc/
Failed: (*VERB) not recognized or malformed at offset 7
/(*LIMIT_MATCH=4294967290)abc/
Failed: (*VERB) not recognized or malformed at offset 7
/(*LIMIT_RECURSION=4294967280)abc/I
Capturing subpattern count = 0
Recursion limit = 4294967280
No options
First char = 'a'
Need char = 'c'
/(a+)*zz/
aaaaaaaaaaaaaz
No match
aaaaaaaaaaaaaz\q3000
Error -8 (match limit exceeded)
/(a+)*zz/S-
aaaaaaaaaaaaaz\Q10
Error -21 (recursion limit exceeded)
/(*LIMIT_MATCH=3000)(a+)*zz/I
Capturing subpattern count = 1
Match limit = 3000
No options
No first char
Need char = 'z'
aaaaaaaaaaaaaz
Error -8 (match limit exceeded)
aaaaaaaaaaaaaz\q60000
Error -8 (match limit exceeded)
/(*LIMIT_MATCH=60000)(*LIMIT_MATCH=3000)(a+)*zz/I
Capturing subpattern count = 1
Match limit = 3000
No options
No first char
Need char = 'z'
aaaaaaaaaaaaaz
Error -8 (match limit exceeded)
/(*LIMIT_MATCH=60000)(a+)*zz/I
Capturing subpattern count = 1
Match limit = 60000
No options
No first char
Need char = 'z'
aaaaaaaaaaaaaz
No match
aaaaaaaaaaaaaz\q3000
Error -8 (match limit exceeded)
/(*LIMIT_RECURSION=10)(a+)*zz/IS-
Capturing subpattern count = 1
Recursion limit = 10
No options
No first char
Need char = 'z'
Subject length lower bound = 2
Starting chars: a z
aaaaaaaaaaaaaz
Error -21 (recursion limit exceeded)
aaaaaaaaaaaaaz\Q1000
Error -21 (recursion limit exceeded)
/(*LIMIT_RECURSION=10)(*LIMIT_RECURSION=1000)(a+)*zz/IS-
Capturing subpattern count = 1
Recursion limit = 10
No options
No first char
Need char = 'z'
Subject length lower bound = 2
Starting chars: a z
aaaaaaaaaaaaaz
Error -21 (recursion limit exceeded)
/(*LIMIT_RECURSION=1000)(a+)*zz/IS-
Capturing subpattern count = 1
Recursion limit = 1000
No options
No first char
Need char = 'z'
Subject length lower bound = 2
Starting chars: a z
aaaaaaaaaaaaaz
No match
aaaaaaaaaaaaaz\Q10
Error -21 (recursion limit exceeded)
/-- This test causes a segfault with Perl 5.18.0 --/
/^(?=(a)){0}b(?1)/
backgammon
0: ba
/(?|(?<n>f)|(?<n>b))/JI
Capturing subpattern count = 1
Named capturing subpatterns:
n 1
Options: dupnames
No first char
No need char
/(?<a>abc)(?<a>z)\k<a>()/JDZS
------------------------------------------------------------------
Bra
CBra 1
abc
Ket
CBra 2
z
Ket
\k<a>2
CBra 3
Ket
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 3
Max back reference = 2
Named capturing subpatterns:
a 1
a 2
Options: dupnames
First char = 'a'
Need char = 'z'
Subject length lower bound = 5
No starting char list
/a*[bcd]/BZ
------------------------------------------------------------------
Bra
a*+
[b-d]
Ket
End
------------------------------------------------------------------
/[bcd]*a/BZ
------------------------------------------------------------------
Bra
[b-d]*+
a
Ket
End
------------------------------------------------------------------
/-- A complete set of tests for auto-possessification of character types --/
/\D+\D \D+\d \D+\S \D+\s \D+\W \D+\w \D+. \D+\C \D+\R \D+\H \D+\h \D+\V \D+\v \D+\Z \D+\z \D+$/BZx
------------------------------------------------------------------
Bra
\D+
\D
\D++
\d
\D+
\S
\D+
\s
\D+
\W
\D+
\w
\D+
Any
\D+
AllAny
\D+
\R
\D+
\H
\D+
\h
\D+
\V
\D+
\v
\D+
\Z
\D++
\z
\D+
$
Ket
End
------------------------------------------------------------------
/\d+\D \d+\d \d+\S \d+\s \d+\W \d+\w \d+. \d+\C \d+\R \d+\H \d+\h \d+\V \d+\v \d+\Z \d+\z \d+$/BZx
------------------------------------------------------------------
Bra
\d++
\D
\d+
\d
\d+
\S
\d++
\s
\d++
\W
\d+
\w
\d+
Any
\d+
AllAny
\d++
\R
\d+
\H
\d++
\h
\d+
\V
\d++
\v
\d++
\Z
\d++
\z
\d++
$
Ket
End
------------------------------------------------------------------
/\S+\D \S+\d \S+\S \S+\s \S+\W \S+\w \S+. \S+\C \S+\R \S+\H \S+\h \S+\V \S+\v \S+\Z \S+\z \S+$/BZx
------------------------------------------------------------------
Bra
\S+
\D
\S+
\d
\S+
\S
\S++
\s
\S+
\W
\S+
\w
\S+
Any
\S+
AllAny
\S++
\R
\S+
\H
\S++
\h
\S+
\V
\S++
\v
\S++
\Z
\S++
\z
\S++
$
Ket
End
------------------------------------------------------------------
/\s+\D \s+\d \s+\S \s+\s \s+\W \s+\w \s+. \s+\C \s+\R \s+\H \s+\h \s+\V \s+\v \s+\Z \s+\z \s+$/BZx
------------------------------------------------------------------
Bra
\s+
\D
\s++
\d
\s++
\S
\s+
\s
\s+
\W
\s++
\w
\s+
Any
\s+
AllAny
\s+
\R
\s+
\H
\s+
\h
\s+
\V
\s+
\v
\s+
\Z
\s++
\z
\s+
$
Ket
End
------------------------------------------------------------------
/\W+\D \W+\d \W+\S \W+\s \W+\W \W+\w \W+. \W+\C \W+\R \W+\H \W+\h \W+\V \W+\v \W+\Z \W+\z \W+$/BZx
------------------------------------------------------------------
Bra
\W+
\D
\W++
\d
\W+
\S
\W+
\s
\W+
\W
\W++
\w
\W+
Any
\W+
AllAny
\W+
\R
\W+
\H
\W+
\h
\W+
\V
\W+
\v
\W+
\Z
\W++
\z
\W+
$
Ket
End
------------------------------------------------------------------
/\w+\D \w+\d \w+\S \w+\s \w+\W \w+\w \w+. \w+\C \w+\R \w+\H \w+\h \w+\V \w+\v \w+\Z \w+\z \w+$/BZx
------------------------------------------------------------------
Bra
\w+
\D
\w+
\d
\w+
\S
\w++
\s
\w++
\W
\w+
\w
\w+
Any
\w+
AllAny
\w++
\R
\w+
\H
\w++
\h
\w+
\V
\w++
\v
\w++
\Z
\w++
\z
\w++
$
Ket
End
------------------------------------------------------------------
/\C+\D \C+\d \C+\S \C+\s \C+\W \C+\w \C+. \C+\C \C+\R \C+\H \C+\h \C+\V \C+\v \C+\Z \C+\z \C+$/BZx
------------------------------------------------------------------
Bra
AllAny+
\D
AllAny+
\d
AllAny+
\S
AllAny+
\s
AllAny+
\W
AllAny+
\w
AllAny+
Any
AllAny+
AllAny
AllAny+
\R
AllAny+
\H
AllAny+
\h
AllAny+
\V
AllAny+
\v
AllAny+
\Z
AllAny++
\z
AllAny+
$
Ket
End
------------------------------------------------------------------
/\R+\D \R+\d \R+\S \R+\s \R+\W \R+\w \R+. \R+\C \R+\R \R+\H \R+\h \R+\V \R+\v \R+\Z \R+\z \R+$/BZx
------------------------------------------------------------------
Bra
\R+
\D
\R++
\d
\R+
\S
\R++
\s
\R+
\W
\R++
\w
\R++
Any
\R+
AllAny
\R+
\R
\R+
\H
\R++
\h
\R+
\V
\R+
\v
\R+
\Z
\R++
\z
\R+
$
Ket
End
------------------------------------------------------------------
/\H+\D \H+\d \H+\S \H+\s \H+\W \H+\w \H+. \H+\C \H+\R \H+\H \H+\h \H+\V \H+\v \H+\Z \H+\z \H+$/BZx
------------------------------------------------------------------
Bra
\H+
\D
\H+
\d
\H+
\S
\H+
\s
\H+
\W
\H+
\w
\H+
Any
\H+
AllAny
\H+
\R
\H+
\H
\H++
\h
\H+
\V
\H+
\v
\H+
\Z
\H++
\z
\H+
$
Ket
End
------------------------------------------------------------------
/\h+\D \h+\d \h+\S \h+\s \h+\W \h+\w \h+. \h+\C \h+\R \h+\H \h+\h \h+\V \h+\v \h+\Z \h+\z \h+$/BZx
------------------------------------------------------------------
Bra
\h+
\D
\h++
\d
\h++
\S
\h+
\s
\h+
\W
\h++
\w
\h+
Any
\h+
AllAny
\h++
\R
\h++
\H
\h+
\h
\h+
\V
\h++
\v
\h+
\Z
\h++
\z
\h+
$
Ket
End
------------------------------------------------------------------
/\V+\D \V+\d \V+\S \V+\s \V+\W \V+\w \V+. \V+\C \V+\R \V+\H \V+\h \V+\V \V+\v \V+\Z \V+\z \V+$/BZx
------------------------------------------------------------------
Bra
\V+
\D
\V+
\d
\V+
\S
\V+
\s
\V+
\W
\V+
\w
\V+
Any
\V+
AllAny
\V++
\R
\V+
\H
\V+
\h
\V+
\V
\V++
\v
\V+
\Z
\V++
\z
\V+
$
Ket
End
------------------------------------------------------------------
/\v+\D \v+\d \v+\S \v+\s \v+\W \v+\w \v+. \v+\C \v+\R \v+\H \v+\h \v+\V \v+\v \v+\Z \v+\z \v+$/BZx
------------------------------------------------------------------
Bra
\v+
\D
\v++
\d
\v++
\S
\v+
\s
\v+
\W
\v++
\w
\v+
Any
\v+
AllAny
\v+
\R
\v+
\H
\v++
\h
\v++
\V
\v+
\v
\v+
\Z
\v++
\z
\v+
$
Ket
End
------------------------------------------------------------------
/ a+\D a+\d a+\S a+\s a+\W a+\w a+. a+\C a+\R a+\H a+\h a+\V a+\v a+\Z a+\z a+$/BZx
------------------------------------------------------------------
Bra
a+
\D
a++
\d
a+
\S
a++
\s
a++
\W
a+
\w
a+
Any
a+
AllAny
a++
\R
a+
\H
a++
\h
a+
\V
a++
\v
a++
\Z
a++
\z
a++
$
Ket
End
------------------------------------------------------------------
/\n+\D \n+\d \n+\S \n+\s \n+\W \n+\w \n+. \n+\C \n+\R \n+\H \n+\h \n+\V \n+\v \n+\Z \n+\z \n+$/BZx
------------------------------------------------------------------
Bra
\x0a+
\D
\x0a++
\d
\x0a++
\S
\x0a+
\s
\x0a+
\W
\x0a++
\w
\x0a+
Any
\x0a+
AllAny
\x0a+
\R
\x0a+
\H
\x0a++
\h
\x0a++
\V
\x0a+
\v
\x0a+
\Z
\x0a++
\z
\x0a+
$
Ket
End
------------------------------------------------------------------
/ .+\D .+\d .+\S .+\s .+\W .+\w .+. .+\C .+\R .+\H .+\h .+\V .+\v .+\Z .+\z .+$/BZx
------------------------------------------------------------------
Bra
Any+
\D
Any+
\d
Any+
\S
Any+
\s
Any+
\W
Any+
\w
Any+
Any
Any+
AllAny
Any++
\R
Any+
\H
Any+
\h
Any+
\V
Any+
\v
Any+
\Z
Any++
\z
Any+
$
Ket
End
------------------------------------------------------------------
/ .+\D .+\d .+\S .+\s .+\W .+\w .+. .+\C .+\R .+\H .+\h .+\V .+\v .+\Z .+\z .+$/BZxs
------------------------------------------------------------------
Bra
AllAny+
\D
AllAny+
\d
AllAny+
\S
AllAny+
\s
AllAny+
\W
AllAny+
\w
AllAny+
AllAny
AllAny+
AllAny
AllAny+
\R
AllAny+
\H
AllAny+
\h
AllAny+
\V
AllAny+
\v
AllAny+
\Z
AllAny++
\z
AllAny+
$
Ket
End
------------------------------------------------------------------
/\D+$ \d+$ \S+$ \s+$ \W+$ \w+$ \C+$ \R+$ \H+$ \h+$ \V+$ \v+$ a+$ \n+$ .+$ .+$/BZxm
------------------------------------------------------------------
Bra
\D+
/m $
\d++
/m $
\S++
/m $
\s+
/m $
\W+
/m $
\w++
/m $
AllAny+
/m $
\R+
/m $
\H+
/m $
\h+
/m $
\V+
/m $
\v+
/m $
a+
/m $
\x0a+
/m $
Any+
/m $
Any+
/m $
Ket
End
------------------------------------------------------------------
/(?=a+)a(a+)++a/BZ
------------------------------------------------------------------
Bra
Assert
a++
Ket
a
CBraPos 1
a++
KetRpos
a
Ket
End
------------------------------------------------------------------
/a+(bb|cc)a+(?:bb|cc)a+(?>bb|cc)a+(?:bb|cc)+a+(aa)a+(?:bb|aa)/BZ
------------------------------------------------------------------
Bra
a++
CBra 1
bb
Alt
cc
Ket
a++
Bra
bb
Alt
cc
Ket
a++
Once_NC
bb
Alt
cc
Ket
a++
Bra
bb
Alt
cc
KetRmax
a+
CBra 2
aa
Ket
a+
Bra
bb
Alt
aa
Ket
Ket
End
------------------------------------------------------------------
/a+(bb|cc)?#a+(?:bb|cc)??#a+(?:bb|cc)?+#a+(?:bb|cc)*#a+(bb|cc)?a#a+(?:aa)?/BZ
------------------------------------------------------------------
Bra
a++
Brazero
CBra 1
bb
Alt
cc
Ket
#
a++
Braminzero
Bra
bb
Alt
cc
Ket
#
a++
Once
Brazero
Bra
bb
Alt
cc
Ket
Ket
#
a++
Brazero
Bra
bb
Alt
cc
KetRmax
#
a+
Brazero
CBra 2
bb
Alt
cc
Ket
a#
a+
Brazero
Bra
aa
Ket
Ket
End
------------------------------------------------------------------
/a+(?:bb)?a#a+(?:|||)#a+(?:|b)a#a+(?:|||)?a/BZ
------------------------------------------------------------------
Bra
a+
Brazero
Bra
bb
Ket
a#
a++
Bra
Alt
Alt
Alt
Ket
#
a+
Bra
Alt
b
Ket
a#
a+
Brazero
Bra
Alt
Alt
Alt
Ket
a
Ket
End
------------------------------------------------------------------
/[ab]*/BZ
------------------------------------------------------------------
Bra
[ab]*+
Ket
End
------------------------------------------------------------------
aaaa
0: aaaa
/[ab]*?/BZ
------------------------------------------------------------------
Bra
[ab]*?
Ket
End
------------------------------------------------------------------
aaaa
0:
/[ab]?/BZ
------------------------------------------------------------------
Bra
[ab]?+
Ket
End
------------------------------------------------------------------
aaaa
0: a
/[ab]??/BZ
------------------------------------------------------------------
Bra
[ab]??
Ket
End
------------------------------------------------------------------
aaaa
0:
/[ab]+/BZ
------------------------------------------------------------------
Bra
[ab]++
Ket
End
------------------------------------------------------------------
aaaa
0: aaaa
/[ab]+?/BZ
------------------------------------------------------------------
Bra
[ab]+?
Ket
End
------------------------------------------------------------------
aaaa
0: a
/[ab]{2,3}/BZ
------------------------------------------------------------------
Bra
[ab]{2,3}+
Ket
End
------------------------------------------------------------------
aaaa
0: aaa
/[ab]{2,3}?/BZ
------------------------------------------------------------------
Bra
[ab]{2,3}?
Ket
End
------------------------------------------------------------------
aaaa
0: aa
/[ab]{2,}/BZ
------------------------------------------------------------------
Bra
[ab]{2,}+
Ket
End
------------------------------------------------------------------
aaaa
0: aaaa
/[ab]{2,}?/BZ
------------------------------------------------------------------
Bra
[ab]{2,}?
Ket
End
------------------------------------------------------------------
aaaa
0: aa
/\d+\s{0,5}=\s*\S?=\w{0,4}\W*/BZ
------------------------------------------------------------------
Bra
\d++
\s{0,5}+
=
\s*+
\S?
=
\w{0,4}+
\W*+
Ket
End
------------------------------------------------------------------
/[a-d]{5,12}[e-z0-9]*#[^a-z]+[b-y]*a[2-7]?[^0-9a-z]+/BZ
------------------------------------------------------------------
Bra
[a-d]{5,12}+
[0-9e-z]*+
#
[\x00-`{-\xff] (neg)++
[b-y]*+
a
[2-7]?+
[\x00-/:-`{-\xff] (neg)++
Ket
End
------------------------------------------------------------------
/[a-z]*\s#[ \t]?\S#[a-c]*\S#[C-G]+?\d#[4-8]*\D#[4-9,]*\D#[!$]{0,5}\w#[M-Xf-l]+\W#[a-c,]?\W/BZ
------------------------------------------------------------------
Bra
[a-z]*+
\s
#
[\x09 ]?+
\S
#
[a-c]*
\S
#
[C-G]++
\d
#
[4-8]*+
\D
#
[,4-9]*
\D
#
[!$]{0,5}+
\w
#
[M-Xf-l]++
\W
#
[,a-c]?
\W
Ket
End
------------------------------------------------------------------
/a+(aa|bb)*c#a*(bb|cc)*a#a?(bb|cc)*d#[a-f]*(g|hh)*f/BZ
------------------------------------------------------------------
Bra
a+
Brazero
CBra 1
aa
Alt
bb
KetRmax
c#
a*
Brazero
CBra 2
bb
Alt
cc
KetRmax
a#
a?+
Brazero
CBra 3
bb
Alt
cc
KetRmax
d#
[a-f]*
Brazero
CBra 4
g
Alt
hh
KetRmax
f
Ket
End
------------------------------------------------------------------
/[a-f]*(g|hh|i)*i#[a-x]{4,}(y{0,6})*y#[a-k]+(ll|mm)+n/BZ
------------------------------------------------------------------
Bra
[a-f]*+
Brazero
CBra 1
g
Alt
hh
Alt
i
KetRmax
i#
[a-x]{4,}
Brazero
SCBra 2
y{0,6}
KetRmax
y#
[a-k]++
CBra 3
ll
Alt
mm
KetRmax
n
Ket
End
------------------------------------------------------------------
/[a-f]*(?>gg|hh)+#[a-f]*(?>gg|hh)?#[a-f]*(?>gg|hh)*a#[a-f]*(?>gg|hh)*h/BZ
------------------------------------------------------------------
Bra
[a-f]*+
Once_NC
gg
Alt
hh
KetRmax
#
[a-f]*+
Brazero
Once_NC
gg
Alt
hh
Ket
#
[a-f]*
Brazero
Once_NC
gg
Alt
hh
KetRmax
a#
[a-f]*+
Brazero
Once_NC
gg
Alt
hh
KetRmax
h
Ket
End
------------------------------------------------------------------
/[a-c]*d/DZS
------------------------------------------------------------------
Bra
[a-c]*+
d
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
No options
No first char
Need char = 'd'
Subject length lower bound = 1
Starting chars: a b c d
/[a-c]+d/DZS
------------------------------------------------------------------
Bra
[a-c]++
d
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
No options
No first char
Need char = 'd'
Subject length lower bound = 2
Starting chars: a b c
/[a-c]?d/DZS
------------------------------------------------------------------
Bra
[a-c]?+
d
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
No options
No first char
Need char = 'd'
Subject length lower bound = 1
Starting chars: a b c d
/[a-c]{4,6}d/DZS
------------------------------------------------------------------
Bra
[a-c]{4,6}+
d
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
No options
No first char
Need char = 'd'
Subject length lower bound = 5
Starting chars: a b c
/[a-c]{0,6}d/DZS
------------------------------------------------------------------
Bra
[a-c]{0,6}+
d
Ket
End
------------------------------------------------------------------
Capturing subpattern count = 0
No options
No first char
Need char = 'd'
Subject length lower bound = 1
Starting chars: a b c d
/-- End of special auto-possessive tests --/
/^A\o{1239}B/
Failed: non-octal character in \o{} (closing brace missing?) at offset 8
/^A\oB/
Failed: missing opening brace after \o at offset 3
/^A\x{zz}B/
Failed: non-hex character in \x{} (closing brace missing?) at offset 5
/^A\x{12Z/
Failed: non-hex character in \x{} (closing brace missing?) at offset 7
/^A\x{/
Failed: non-hex character in \x{} (closing brace missing?) at offset 5
/[ab]++/BZO
------------------------------------------------------------------
Bra
[ab]++
Ket
End
------------------------------------------------------------------
/[^ab]*+/BZO
------------------------------------------------------------------
Bra
[\x00-`c-\xff] (neg)*+
Ket
End
------------------------------------------------------------------
/a{4}+/BZO
------------------------------------------------------------------
Bra
a{4}
Ket
End
------------------------------------------------------------------
/a{4}+/BZOi
------------------------------------------------------------------
Bra
/i a{4}
Ket
End
------------------------------------------------------------------
/[a-[:digit:]]+/
Failed: invalid range in character class at offset 3
/[A-[:digit:]]+/
Failed: invalid range in character class at offset 3
/[a-[.xxx.]]+/
Failed: invalid range in character class at offset 3
/[a-[=xxx=]]+/
Failed: invalid range in character class at offset 3
/[a-[!xxx!]]+/
Failed: range out of order in character class at offset 3
/[A-[!xxx!]]+/
A]]]
0: A]]]
/[a-\d]+/
Failed: invalid range in character class at offset 4
/(?<0abc>xx)/
Failed: group name must start with a non-digit at offset 3
/(?&1abc)xx(?<1abc>y)/
Failed: group name must start with a non-digit at offset 3
/(?<ab-cd>xx)/
Failed: syntax error in subpattern name (missing terminator) at offset 5
/(?'0abc'xx)/
Failed: group name must start with a non-digit at offset 3
/(?P<0abc>xx)/
Failed: group name must start with a non-digit at offset 4
/\k<5ghj>/
Failed: group name must start with a non-digit at offset 3
/\k'5ghj'/
Failed: group name must start with a non-digit at offset 3
/\k{2fgh}/
Failed: group name must start with a non-digit at offset 3
/(?P=8yuki)/
Failed: group name must start with a non-digit at offset 4
/\g{4df}/
Failed: group name must start with a non-digit at offset 3
/(?&1abc)xx(?<1abc>y)/
Failed: group name must start with a non-digit at offset 3
/(?P>1abc)xx(?<1abc>y)/
Failed: group name must start with a non-digit at offset 4
/\g'3gh'/
Failed: \g is not followed by a braced, angle-bracketed, or quoted name/number or by a plain number at offset 2
/\g<5fg>/
Failed: \g is not followed by a braced, angle-bracketed, or quoted name/number or by a plain number at offset 2
/(?(<4gh>)abc)/
Failed: group name must start with a non-digit at offset 4
/(?('4gh')abc)/
Failed: group name must start with a non-digit at offset 4
/(?(4gh)abc)/
Failed: malformed number or name after (?( at offset 4
/(?(R&6yh)abc)/
Failed: group name must start with a non-digit at offset 5
/(((a\2)|(a*)\g<-1>))*a?/BZ
------------------------------------------------------------------
Bra
Brazero
SCBra 1
Once
CBra 2
CBra 3
a
\2
Ket
Alt
CBra 4
a*
Ket
Recurse
Ket
Ket
KetRmax
a?+
Ket
End
------------------------------------------------------------------
/-- Test the ugly "start or end of word" compatibility syntax --/
/[[:<:]]red[[:>:]]/BZ
------------------------------------------------------------------
Bra
\b
Assert
\w
Ket
red
\b
AssertB
Reverse
\w
Ket
Ket
End
------------------------------------------------------------------
little red riding hood
0: red
a /red/ thing
0: red
red is a colour
0: red
put it all on red
0: red
** Failers
No match
no reduction
No match
Alfred Winifred
No match
/[a[:<:]] should give error/
Failed: unknown POSIX class name at offset 4
/(?=ab\K)/+
abcd
Start of matched string is beyond its end - displaying from end to start.
0: ab
0+ abcd
/abcd/f<lf>
xx\nxabcd
No match
/ -- Test stack check external calls --/
/(((((a)))))/Q0
/(((((a)))))/Q1
Failed: parentheses are too deeply nested (stack check) at offset 0
/(((((a)))))/Q
** Missing 0 or 1 after /Q
/^\w+(?>\s*)(?<=\w)/BZ
------------------------------------------------------------------
Bra
^
\w+
Once_NC
\s*+
Ket
AssertB
Reverse
\w
Ket
Ket
End
------------------------------------------------------------------
/\othing/
Failed: missing opening brace after \o at offset 1
/\o{}/
Failed: digits missing in \x{} or \o{} at offset 1
/\o{whatever}/
Failed: non-octal character in \o{} (closing brace missing?) at offset 3
/\xthing/
/\x{}/
Failed: digits missing in \x{} or \o{} at offset 3
/\x{whatever}/
Failed: non-hex character in \x{} (closing brace missing?) at offset 3
"((?=(?(?=(?(?=(?(?=()))))))))"
a
0:
1:
2:
"(?(?=)==)(((((((((?=)))))))))"
a
No match
/^(?:(a)|b)(?(1)A|B)/I
Capturing subpattern count = 1
Max back reference = 1
Options: anchored
No first char
No need char
aA123\O3
Matched, but too many substrings
0: aA
aA123\O6
0: aA
1: a
'^(?:(?<AA>a)|b)(?(<AA>)A|B)'
aA123\O3
Matched, but too many substrings
0: aA
aA123\O6
0: aA
1: a
'^(?<AA>)(?:(?<AA>a)|b)(?(<AA>)A|B)'J
aA123\O3
Matched, but too many substrings
0: aA
aA123\O6
Matched, but too many substrings
0: aA
1:
'^(?:(?<AA>X)|)(?:(?<AA>a)|b)\k{AA}'J
aa123\O3
Matched, but too many substrings
0: aa
aa123\O6
Matched, but too many substrings
0: aa
1: <unset>
/(?<N111>(?J)(?<N111>1(111111)11|)1|1|)(?(<N111>)1)/
/(?(?=0)?)+/
Failed: nothing to repeat at offset 7
/(?(?=0)(?=00)?00765)/
00765
0: 00765
/(?(?=0)(?=00)?00765|(?!3).56)/
00765
0: 00765
456
0: 456
** Failers
No match
356
No match
'^(a)*+(\w)'
g
0: g
1: <unset>
2: g
g\O3
Matched, but too many substrings
0: g
'^(?:a)*+(\w)'
g
0: g
1: g
g\O3
Matched, but too many substrings
0: g
//C
\O\C+
Callout 255: last capture = -1
--->
+0 ^
Matched, but too many substrings
"((?2){0,1999}())?"
/((?+1)(\1))/BZ
------------------------------------------------------------------
Bra
Once
CBra 1
Recurse
CBra 2
\1
Ket
Ket
Ket
Ket
End
------------------------------------------------------------------
/(?(?!)a|b)/
bbb
0: b
aaa
No match
"((?2)+)((?1))"
"(?(?<E>.*!.*)?)"
Failed: assertion expected after (?( or (?(?C) at offset 3
"X((?2)()*+){2}+"BZ
------------------------------------------------------------------
Bra
X
Once
CBra 1
Recurse
Braposzero
SCBraPos 2
KetRpos
Ket
CBra 1
Recurse
Braposzero
SCBraPos 2
KetRpos
Ket
Ket
Ket
End
------------------------------------------------------------------
"X((?2)()*+){2}"BZ
------------------------------------------------------------------
Bra
X
CBra 1
Recurse
Braposzero
SCBraPos 2
KetRpos
Ket
CBra 1
Recurse
Braposzero
SCBraPos 2
KetRpos
Ket
Ket
End
------------------------------------------------------------------
"(?<=((?2))((?1)))"
Failed: lookbehind assertion is not fixed length at offset 17
/(?<=\Ka)/g+
aaaaa
0: a
0+ aaaa
0: a
0+ aaaa
0: a
0+ aaa
0: a
0+ aa
0: a
0+ a
0: a
0+
/(?<=\Ka)/G+
aaaaa
0: a
0+ aaaa
0: a
0+ aaa
0: a
0+ aa
0: a
0+ a
0: a
0+
/((?2){73}(?2))((?1))/
/.((?2)(?R)\1)()/BZ
------------------------------------------------------------------
Bra
Any
Once
CBra 1
Recurse
Recurse
\1
Ket
Ket
CBra 2
Ket
Ket
End
------------------------------------------------------------------
/(?1)()((((((\1++))\x85)+)|))/
/(\9*+(?2);\3++()2|)++{/
Failed: reference to non-existent subpattern at offset 22
/\V\x85\9*+((?2)\3++()2)*:2/
Failed: reference to non-existent subpattern at offset 26
/(((?(R)){0,2}) (?''((?'R')((?'R')))))/J
/(((?(X)){0,2}) (?''((?'X')((?'X')))))/J
/(((?(R)){0,2}) (?''((?'X')((?'R')))))/
"(?J)(?'d'(?'d'\g{d}))"
".*?\h.+.\.+\R*?\xd(?i)(?=!(?=b`b`b`\`b\xa9b!)`\a`bbbbbbbbbbbbb`bbbbbbbbbbbb*R\x85bbbbbbb\C?{((?2)(?))((
\H){8(?<=(?1){29}\xa8bbbb\x16\xd\xc6^($(?<! )(\xa9H4){4}h}1)B))\x15')"
"(?J:(?|(?'R')(\k'R')|((?'R'))))"
/(?<=|(\,\$(?73591620449005828816)\xa8.{7}){6}\x09)/
Failed: number is too big at offset 32
//
\O1
Matched, but too many substrings
/^(?:(?(1)x|)+)+$()/BZ
------------------------------------------------------------------
Bra
^
SBra
SCond
1 Cond ref
x
Alt
KetRmax
KetRmax
$
CBra 1
Ket
Ket
End
------------------------------------------------------------------
/(?=di(?<=(?1))|(?=(.))))/
Failed: unmatched parentheses at offset 23
/(?(R))*+/BZ
------------------------------------------------------------------
Bra
Braposzero
SBraPos
SCond
Cond recurse any
Ket
KetRpos
Ket
End
------------------------------------------------------------------
/[[:\\](?'abc')[a:]/
"[[[.\xe8Nq\xffq\xff\xe0\x2|||::Nq\xffq\xff\xe0\x6\x2|||::[[[:[::::::[[[[[::::::::[:[[[:[:::[[[[[[[[[[[[:::::::::::::::::[[.\xe8Nq\xffq\xff\xe0\x2|||::Nq\xffq\xff\xe0\x6\x2|||::[[[:[::::::[[[[[::::::::[:[[[:[:::[[[[[[[[[[[[[[:::E[[[:[:[[:[:::[[:::E[[[:[:[[:'[:::::E[[[:[::::::[[[:[[[[[[[::E[[[:[::::::[[[:[[[[[[[[:[[::[::::[[:::::::[[:[[[[[[[:[[::[:[[:[~"
Failed: missing terminating ] for character class at offset 353
/()(?(R)0)*+/BZ
------------------------------------------------------------------
Bra
CBra 1
Ket
Braposzero
SBraPos
SCond
Cond recurse any
0
Ket
KetRpos
Ket
End
------------------------------------------------------------------
/(?R-:(?</
Failed: (?R or (?[+-]digits must be followed by ) at offset 3
/(?1){3918}(((((0(\k'R'))))(?J)(?'R'(?'R'\3){99})))/I
Capturing subpattern count = 8
Max back reference = 8
Named capturing subpatterns:
R 7
R 8
No options
Duplicate name status changes
No first char
Need char = '0'
/(?J:(?|(:(?|(?'R')(\k'R')|((?'R')))H'Rk'Rf)|s(?'R')))/
/0(?0)|(1)(*THEN)(*SKIP:0)(*FAIL)/
01
No match
/((?(R8000000000)))/
Failed: number is too big at offset 16
/(?(8000000000/
Failed: number is too big at offset 13
/(?:ab)?(?:ab)(?:ab)/
abab
0: abab
ababab
0: ababab
aba
No match
/((*MARK:A))++a(*SKIP:B)b/
aacb
No match
/(?J:(?|(:(?|(?'R')(\z(?|(?'R')(\k'R')|((?'R')))k'R')|((?'R')))H'Ak'Rf)|s(?'R')))/
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/a[[:punct:]b]/BZ
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Bra
a
[!-/:-@[-`b{-~]
Ket
End
------------------------------------------------------------------
/L(?#(|++<!(2)?/BZ
------------------------------------------------------------------
Bra
L?+
Ket
End
------------------------------------------------------------------
/L(?#(|++<!(2)?/BOZ
------------------------------------------------------------------
Bra
L?
Ket
End
------------------------------------------------------------------
/L(?#(|++<!(2)?/BCZ
------------------------------------------------------------------
Bra
Callout 255 0 14
L?+
Callout 255 14 0
Ket
End
------------------------------------------------------------------
/L(?#(|++<!(2)?/BCOZ
------------------------------------------------------------------
Bra
Callout 255 0 14
L?
Callout 255 14 0
Ket
End
------------------------------------------------------------------
/(A*)\E+/CBZ
------------------------------------------------------------------
Bra
Callout 255 0 7
SCBra 1
Callout 255 1 2
A*
Callout 255 3 0
KetRmax
Callout 255 7 0
Ket
End
------------------------------------------------------------------
/()\Q\E*]/BCZ
------------------------------------------------------------------
Bra
Callout 255 0 7
Brazero
SCBra 1
Callout 255 1 0
KetRmax
Callout 255 7 1
]
Callout 255 8 0
Ket
End
------------------------------------------------------------------
/(?<A>)(?J:(?<B>)(?<B>))(?<C>)/
\O\CC
Matched, but too many substrings
copy substring C failed -7
/(?=a\K)/
ring bpattingbobnd $ 1,oern cou \rb\L
Start of matched string is beyond its end - displaying from end to start.
0: a
0L
/(?<=((?C)0))/
9010
--->9010
0 ^ 0
0 ^ 0
0:
1: 0
abcd
--->abcd
0 ^ 0
0 ^ 0
0 ^ 0
0 ^ 0
No match
/((?J)(?'R'(?'R'(?'R'(?'R'(?'R'(?|(\k'R'))))))))/
/\N(?(?C)0?!.)*/
Failed: assertion expected after (?( or (?(?C) at offset 4
/(?<RA>abc)(?(R)xyz)/BZ
------------------------------------------------------------------
Bra
CBra 1
abc
Ket
Cond
Cond recurse any
xyz
Ket
Ket
End
------------------------------------------------------------------
/(?<R>abc)(?(R)xyz)/BZ
------------------------------------------------------------------
Bra
CBra 1
abc
Ket
Cond
1 Cond ref
xyz
Ket
Ket
End
------------------------------------------------------------------
/(?=.*[A-Z])/I
Capturing subpattern count = 0
May match empty string
No options
No first char
No need char
"(?<=(a))\1?b"
ab
0: b
1: a
aaab
0: ab
1: a
"(?=(a))\1?b"
ab
0: ab
1: a
aaab
0: ab
1: a
/(?(?=^))b/
abc
0: b
/-- End of testinput2 --/
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