# This set of tests is not Perl-compatible. It checks on special features
# of PCRE2's API, error diagnostics, and the compiled code of some patterns.
# It also checks the non-Perl syntax that PCRE2 supports (Python, .NET,
# Oniguruma). There are also some tests where PCRE2 and Perl differ,
# either because PCRE2 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.

#forbid_utf
#newline_default lf any anycrlf

# Test binary zeroes in the pattern

# /a\0B/ where 0 is a binary zero
/61 5c 00 62/B,hex
    a\x{0}b

# /a0b/ where 0 is a binary zero
/61 00 62/B,hex
    a\x{0}b

# /(?#B0C)DE/ where 0 is a binary zero
/28 3f 23 42 00 43 29 44 45/B,hex
    DE

/(a)b|/I

/abc/I
    abc
    defabc
    abc\=anchored
\= Expect no match
    defabc\=anchored
    ABC

/^abc/I
    abc
    abc\=anchored
\= Expect no match
    defabc
    defabc\=anchored

/a+bc/I

/a*bc/I

/a{3}bc/I

/(abc|a+z)/I

/^abc$/I
    abc
\= Expect no match
    def\nabc

/ab\idef/

/(?X)ab\idef/

/x{5,4}/

/z{65536}/

/[abcd/

/[\B]/B

/[\R]/B

/[\X]/B

/[z-a]/

/^*/

/(abc/

/(?# abc/

/(?z)abc/

/.*b/I

/.*?b/I

/cat|dog|elephant/I
    this sentence eventually mentions a cat
    this sentences rambles on and on for a while and then reaches elephant

/cat|dog|elephant/I
    this sentence eventually mentions a cat
    this sentences rambles on and on for a while and then reaches elephant

/cat|dog|elephant/Ii
    this sentence eventually mentions a CAT cat
    this sentences rambles on and on for a while to elephant ElePhant

/a|[bcd]/I

/(a|[^\dZ])/I

/(a|b)*[\s]/I

/(ab\2)/

/{4,5}abc/

/(a)(b)(c)\2/I
    abcb
    abcb\=ovector=0
    abcb\=ovector=1
    abcb\=ovector=2
    abcb\=ovector=3
    abcb\=ovector=4

/(a)bc|(a)(b)\2/I
    abc
    abc\=ovector=0
    abc\=ovector=1
    abc\=ovector=2
    aba
    aba\=ovector=0
    aba\=ovector=1
    aba\=ovector=2
    aba\=ovector=3
    aba\=ovector=4

/abc$/I,dollar_endonly
    abc
\= Expect no match
    abc\n
    abc\ndef

/(a)(b)(c)(d)(e)\6/

/the quick brown fox/I
    the quick brown fox
    this is a line with the quick brown fox

/the quick brown fox/I,anchored
    the quick brown fox
\= Expect no match
    this is a line with the quick brown fox

/ab(?z)cd/

/^abc|def/I
    abcdef
    abcdef\=notbol

/.*((abc)$|(def))/I
    defabc
    defabc\=noteol

/)/

/a[]b/

/[^aeiou ]{3,}/I
    co-processors, and for

/<.*>/I
    abc<def>ghi<klm>nop

/<.*?>/I
    abc<def>ghi<klm>nop

/<.*>/I,ungreedy
    abc<def>ghi<klm>nop

/(?U)<.*>/I
    abc<def>ghi<klm>nop

/<.*?>/I,ungreedy
    abc<def>ghi<klm>nop

/={3,}/I,ungreedy
    abc========def

/(?U)={3,}?/I
    abc========def

/(?<!bar|cattle)foo/I
    foo
    catfoo
\= Expect no match
    the barfoo
    and cattlefoo

/abc(?<=a+)b/

/12345(?<=aaa|b{0,3})b/

/(?<!(foo)a\1)bar/

/(?i)abc/I

/(a|(?m)a)/I

/(?i)^1234/I

/(^b|(?i)^d)/I

/(?s).*/I

/[abcd]/I

/(?i)[abcd]/I

/(?m)[xy]|(b|c)/I

/(^a|^b)/Im

/(?i)(^a|^b)/Im

/(a)(?(1)a|b|c)/

/(?(?=a)a|b|c)/

/(?(1a)/

/(?(1a))/

/(?(?i))/

/(?(abc))/

/(?(?<ab))/

/((?s)blah)\s+\1/I

/((?i)blah)\s+\1/I

/((?i)b)/IB

/(a*b|(?i:c*(?-i)d))/I

/a$/I
    a
    a\n
\= Expect no match
    a\=noteol
    a\n\=noteol

/a$/Im
    a
    a\n
    a\n\=noteol
\= Expect no match
    a\=noteol

/\Aabc/Im

/^abc/Im

/^((a+)(?U)([ab]+)(?-U)([bc]+)(\w*))/I
  aaaaabbbbbcccccdef

/(?<=foo)[ab]/I

/(?<!foo)(alpha|omega)/I

/(?!alphabet)[ab]/I

/(?<=foo\n)^bar/Im
    foo\nbarbar
\= Expect no match
    rhubarb
    barbell
    abc\nbarton

/^(?<=foo\n)bar/Im
    foo\nbarbar
\= Expect no match
    rhubarb
    barbell
    abc\nbarton

/(?>^abc)/Im
    abc
    def\nabc
\= Expect no match
    defabc

/(?<=ab(c+)d)ef/

/(?<=ab(?<=c+)d)ef/

/(?<=ab(c|de)f)g/

/The next three are in testinput2 because they have variable length branches/

/(?<=bullock|donkey)-cart/I
    the bullock-cart
    a donkey-cart race
\= Expect no match
    cart
    horse-and-cart

/(?<=ab(?i)x|y|z)/I

/(?>.*)(?<=(abcd)|(xyz))/I
    alphabetabcd
    endingxyz

/(?<=ab(?i)x(?-i)y|(?i)z|b)ZZ/I
    abxyZZ
    abXyZZ
    ZZZ
    zZZ
    bZZ
    BZZ
\= Expect no match
    ZZ
    abXYZZ
    zzz
    bzz

/(?<!(foo)a)bar/I
    bar
    foobbar
\= Expect no match
    fooabar

# This one is here because Perl behaves differently; see also the following.

/^(a\1?){4}$/I
\= Expect no match
    aaaa
    aaaaaa

# 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
# a recursive reference to itself. PCRE has now made these into atomic patterns.

/^(xa|=?\1a){2}$/
    xa=xaa
\= Expect no match
    xa=xaaa

/^(xa|=?\1a)+$/
    xa=xaa
\= Expect no match
    xa=xaaa

# These are syntax tests from Perl 5.005

/a[b-a]/

/a[]b/

/a[/

/*a/

/(*)b/

/abc)/

/(abc/

/a**/

/)(/

/\1/

/\2/

/(a)|\2/

/a[b-a]/Ii

/a[]b/Ii

/a[/Ii

/*a/Ii

/(*)b/Ii

/abc)/Ii

/(abc/Ii

/a**/Ii

/)(/Ii

/:(?:/

/(?<%)b/

/a(?{)b/

/a(?{{})b/

/a(?{}})b/

/a(?{"{"})b/

/a(?{"{"}})b/

/(?(1?)a|b)/

/[a[:xyz:/

/(?<=x+)y/

/a{37,17}/

/abc/\

/abc/\i

/(a)bc(d)/I
    abcd
    abcd\=copy=2
    abcd\=copy=5

/(.{20})/I
    abcdefghijklmnopqrstuvwxyz
    abcdefghijklmnopqrstuvwxyz\=copy=1
    abcdefghijklmnopqrstuvwxyz\=get=1

/(.{15})/I
    abcdefghijklmnopqrstuvwxyz
    abcdefghijklmnopqrstuvwxyz\=copy=1,get=1

/(.{16})/I
    abcdefghijklmnopqrstuvwxyz
    abcdefghijklmnopqrstuvwxyz\=copy=1,get=1,getall

/^(a|(bc))de(f)/I
    adef\=get=1,get=2,get=3,get=4,getall
    bcdef\=get=1,get=2,get=3,get=4,getall
    adefghijk\=copy=0

/^abc\00def/I
    abc\00def\=copy=0,getall

/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

/.*X/IB

/.*X/IBs

/(.*X|^B)/IB

/(.*X|^B)/IBs

/(?s)(.*X|^B)/IB

/(?s:.*X|^B)/IB

/\Biss\B/I,aftertext
    Mississippi

/iss/I,aftertext,altglobal
    Mississippi

/\Biss\B/I,aftertext,altglobal
    Mississippi

/\Biss\B/Ig,aftertext
    Mississippi
\= Expect no match
    Mississippi\=anchored

/(?<=[Ms])iss/Ig,aftertext
    Mississippi

/(?<=[Ms])iss/I,aftertext,altglobal
    Mississippi

/^iss/Ig,aftertext
    ississippi

/.*iss/Ig,aftertext
    abciss\nxyzisspqr

/.i./Ig,aftertext
    Mississippi
    Mississippi\=anchored
    Missouri river
    Missouri river\=anchored

/^.is/Ig,aftertext
    Mississippi

/^ab\n/Ig,aftertext
    ab\nab\ncd

/^ab\n/Igm,aftertext
    ab\nab\ncd

/^/gm,newline=any
    a\rb\nc\r\nxyz\=aftertext

/abc/I

/abc|bac/I

/(abc|bac)/I

/(abc|(c|dc))/I

/(abc|(d|de)c)/I

/a*/I

/a+/I

/(baa|a+)/I

/a{0,3}/I

/baa{3,}/I

/"([^\\"]+|\\.)*"/I

/(abc|ab[cd])/I

/(a|.)/I

/a|ba|\w/I

/abc(?=pqr)/I

/...(?<=abc)/I

/abc(?!pqr)/I

/ab./I

/ab[xyz]/I

/abc*/I

/ab.c*/I

/a.c*/I

/.c*/I

/ac*/I

/(a.c*|b.c*)/I

/a.c*|aba/I

/.+a/I

/(?=abcda)a.*/I

/(?=a)a.*/I

/a(b)*/I

/a\d*/I

/ab\d*/I

/a(\d)*/I

/abcde{0,0}/I

/ab\d+/I

/a(?(1)b)(.)/I

/a(?(1)bag|big)(.)/I

/a(?(1)bag|big)*(.)/I

/a(?(1)bag|big)+(.)/I

/a(?(1)b..|b..)(.)/I

/ab\d{0}e/I

/a?b?/I
    a
    b
    ab
    \
\= Expect no match
    \=notempty

/|-/I
    abcd
    -abc
    ab-c\=notempty
\= Expect no match
    abc\=notempty

/^.?abcd/I

/\(             # ( at start
  (?:           # Non-capturing bracket
  (?>[^()]+)    # Either a sequence of non-brackets (no backtracking)
  |             # Or
  (?R)          # Recurse - i.e. nested bracketed string
  )*            # Zero or more contents
  \)            # Closing )
  /Ix
    (abcd)
    (abcd)xyz
    xyz(abcd)
    (ab(xy)cd)pqr
    (ab(xycd)pqr
    () abc ()
    12(abcde(fsh)xyz(foo(bar))lmno)89
\= Expect no match
    abcd
    abcd)
    (abcd

/\(  ( (?>[^()]+) | (?R) )* \) /Igx
    (ab(xy)cd)pqr
    1(abcd)(x(y)z)pqr

/\(  (?: (?>[^()]+) | (?R) ) \) /Ix
    (abcd)
    (ab(xy)cd)
    (a(b(c)d)e)
    ((ab))
\= Expect no match
    ()

/\(  (?: (?>[^()]+) | (?R) )? \) /Ix
    ()
    12(abcde(fsh)xyz(foo(bar))lmno)89

/\(  ( (?>[^()]+) | (?R) )* \) /Ix
    (ab(xy)cd)

/\( ( ( (?>[^()]+) | (?R) )* ) \) /Ix
    (ab(xy)cd)

/\( (123)? ( ( (?>[^()]+) | (?R) )* ) \) /Ix
    (ab(xy)cd)
    (123ab(xy)cd)

/\( ( (123)? ( (?>[^()]+) | (?R) )* ) \) /Ix
    (ab(xy)cd)
    (123ab(xy)cd)

/\( (((((((((( ( (?>[^()]+) | (?R) )* )))))))))) \) /Ix
    (ab(xy)cd)

/\( ( ( (?>[^()<>]+) | ((?>[^()]+)) | (?R) )* ) \) /Ix
    (abcd(xyz<p>qrs)123)

/\( ( ( (?>[^()]+) | ((?R)) )* ) \) /Ix
    (ab(cd)ef)
    (ab(cd(ef)gh)ij)

/^[[:alnum:]]/IB

/^[[:^alnum:]]/IB

/^[[:alpha:]]/IB

/^[[:^alpha:]]/IB

/[_[:alpha:]]/I

/^[[:ascii:]]/IB

/^[[:^ascii:]]/IB

/^[[:blank:]]/IB

/^[[:^blank:]]/IB

/[\n\x0b\x0c\x0d[:blank:]]/I

/^[[:cntrl:]]/IB

/^[[:digit:]]/IB

/^[[:graph:]]/IB

/^[[:lower:]]/IB

/^[[:print:]]/IB

/^[[:punct:]]/IB

/^[[:space:]]/IB

/^[[:upper:]]/IB

/^[[:xdigit:]]/IB

/^[[:word:]]/IB

/^[[:^cntrl:]]/IB

/^[12[:^digit:]]/IB

/^[[:^blank:]]/IB

/[01[:alpha:]%]/IB

/[[.ch.]]/I

/[[=ch=]]/I

/[[:rhubarb:]]/I

/[[:upper:]]/Ii
    A
    a

/[[:lower:]]/Ii
    A
    a

/((?-i)[[:lower:]])[[:lower:]]/Ii
    ab
    aB
\= Expect no match
    Ab
    AB

/[\200-\110]/I

/^(?(0)f|b)oo/I

# This one's here because of the large output vector needed

/(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\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
     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\=ovector=300

# This one's here because Perl does this differently and PCRE2 can't at present

/(main(O)?)+/I
    mainmain
    mainOmain

# These are all cases where Perl does it differently (nested captures)

/^(a(b)?)+$/I
    aba

/^(aa(bb)?)+$/I
    aabbaa

/^(aa|aa(bb))+$/I
    aabbaa

/^(aa(bb)??)+$/I
    aabbaa

/^(?:aa(bb)?)+$/I
    aabbaa

/^(aa(b(b))?)+$/I
    aabbaa

/^(?:aa(b(b))?)+$/I
    aabbaa

/^(?:aa(b(?:b))?)+$/I
    aabbaa

/^(?:aa(bb(?:b))?)+$/I
    aabbbaa

/^(?:aa(b(?:bb))?)+$/I
    aabbbaa

/^(?:aa(?:b(b))?)+$/I
    aabbaa

/^(?:aa(?:b(bb))?)+$/I
    aabbbaa

/^(aa(b(bb))?)+$/I
    aabbbaa

/^(aa(bb(bb))?)+$/I
    aabbbbaa

# ----------------

/#/IBx

/a#/IBx

/[\s]/IB

/[\S]/IB

/a(?i)b/IB
    ab
    aB
\= Expect no match
    AB

/(a(?i)b)/IB
    ab
    aB
\= Expect no match
    AB

/   (?i)abc/IBx

/#this is a comment
  (?i)abc/IBx

/123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890/IB

/\Q123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890/IB

/\Q\E/IB
    \

/\Q\Ex/IB

/ \Q\E/IB

/a\Q\E/IB
  abc
  bca
  bac

/a\Q\Eb/IB
  abc

/\Q\Eabc/IB

/x*+\w/IB
\= Expect no match
    xxxxx

/x?+/IB

/x++/IB

/x{1,3}+/B,no_auto_possess

/x{1,3}+/Bi,no_auto_possess

/[^x]{1,3}+/B,no_auto_possess

/[^x]{1,3}+/Bi,no_auto_possess

/(x)*+/IB

/^(\w++|\s++)*$/I
    now is the time for all good men to come to the aid of the party
\= Expect no match
    this is not a line with only words and spaces!

/(\d++)(\w)/I
    12345a
\= Expect no match
    12345+

/a++b/I
    aaab

/(a++b)/I
    aaab

/(a++)b/I
    aaab

/([^()]++|\([^()]*\))+/I
    ((abc(ade)ufh()()x

/\(([^()]++|\([^()]+\))+\)/I
    (abc)
    (abc(def)xyz)
\= Expect no match
    ((()aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa

/(abc){1,3}+/IB

/a+?+/I

/a{2,3}?+b/I

/(?U)a+?+/I

/a{2,3}?+b/I,ungreedy

/x(?U)a++b/IB
    xaaaab

/(?U)xa++b/IB
    xaaaab

/^((a+)(?U)([ab]+)(?-U)([bc]+)(\w*))/IB

/^x(?U)a+b/IB

/^x(?U)(a+)b/IB

/[.x.]/I

/[=x=]/I

/[:x:]/I

/\l/I

/\L/I

/\N{name}/I

/\u/I

/\U/I

/a{1,3}b/ungreedy
    ab

/[/I

/[a-/I

/[[:space:]/I

/[\s]/IB

/[[:space:]]/IB

/[[:space:]abcde]/IB

/< (?: (?(R) \d++  | [^<>]*+) | (?R)) * >/Ix
    <>
    <abcd>
    <abc <123> hij>
    <abc <def> hij>
    <abc<>def>
    <abc<>
\= Expect no match
    <abc

/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/IB

/\$\<\.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/IB

/(.*)\d+\1/I

/(.*)\d+/I

/(.*)\d+\1/Is

/(.*)\d+/Is

/(.*(xyz))\d+\2/I

/((.*))\d+\1/I
    abc123bc

/a[b]/I

/(?=a).*/I

/(?=abc).xyz/Ii

/(?=abc)(?i).xyz/I

/(?=a)(?=b)/I

/(?=.)a/I

/((?=abcda)a)/I

/((?=abcda)ab)/I

/()a/I

/(?:(?=.)|(?<!x))a/I

/(?(1)ab|ac)(.)/I

/(?(1)abz|acz)(.)/I

/(?(1)abz)(.)/I

/(?(1)abz)(1)23/I

/(a)+/I

/(a){2,3}/I

/(a)*/I

/[a]/I

/[ab]/I

/[ab]/I

/[^a]/I

/\d456/I

/\d456/I

/a^b/I

/^a/Im
  abcde
  xy\nabc
\= Expect no match
  xyabc

/c|abc/I

/(?i)[ab]/I

/[ab](?i)cd/I

/abc(?C)def/I
    abcdef
    1234abcdef
\= Expect no match
    abcxyz
    abcxyzf

/abc(?C)de(?C1)f/I
    123abcdef

/(?C1)\dabc(?C2)def/I
    1234abcdef
\= Expect no match
    abcdef

/(?C1)\dabc(?C2)def/I
    1234abcdef
\= Expect no match
    abcdef

/(?C255)ab/I

/(?C256)ab/I

/(?Cab)xx/I

/(?C12vr)x/I

/abc(?C)def/I
    \x83\x0\x61bcdef

/(abc)(?C)de(?C1)f/I
    123abcdef
    123abcdef\=callout_capture
    123abcdefC-\=callout_none
\= Expect no match
    123abcdef\=callout_fail=1

/(?C0)(abc(?C1))*/I
    abcabcabc
    abcabc\=callout_fail=1:4
    abcabcabc\=callout_fail=1:4

/(\d{3}(?C))*/I
    123\=callout_capture
    123456\=callout_capture
    123456789\=callout_capture

/((xyz)(?C)p|(?C1)xyzabc)/I
    xyzabc\=callout_capture

/(X)((xyz)(?C)p|(?C1)xyzabc)/I
    Xxyzabc\=callout_capture

/(?=(abc))(?C)abcdef/I
    abcdef\=callout_capture

/(?!(abc)(?C1)d)(?C2)abcxyz/I
    abcxyz\=callout_capture

/(?<=(abc)(?C))xyz/I
   abcxyz\=callout_capture

/a(b+)(c*)(?C1)/I
\= Expect no match
    abbbbbccc\=callout_data=1

/a(b+?)(c*?)(?C1)/I
\= Expect no match
    abbbbbccc\=callout_data=1

/(?C)abc/I

/(?C)^abc/I

/(?C)a|b/I

/a|(b)(?C)/I
    b

/x(ab|(bc|(de|(?R))))/I
    xab
    xbc
    xde
    xxab
    xxxab
\= Expect no match
    xyab

/^([^()]|\((?1)*\))*$/I
    abc
    a(b)c
    a(b(c))d
\= Expect no match)
    a(b(c)d

/^>abc>([^()]|\((?1)*\))*<xyz<$/I
   >abc>123<xyz<
   >abc>1(2)3<xyz<
   >abc>(1(2)3)<xyz<

/(a(?1)b)/IB

/(a(?1)+b)/IB

/^(\d+|\((?1)([+*-])(?1)\)|-(?1))$/I
    12
    (((2+2)*-3)-7)
    -12
\= Expect no match
    ((2+2)*-3)-7)

/^(x(y|(?1){2})z)/I
    xyz
    xxyzxyzz
\= Expect no match
    xxyzz
    xxyzxyzxyzz

/((< (?: (?(R) \d++  | [^<>]*+) | (?2)) * >))/Ix
    <>
    <abcd>
    <abc <123> hij>
    <abc <def> hij>
    <abc<>def>
    <abc<>
\= Expect no match
    <abc

/(?1)/I

/((?2)(abc)/I

/^(abc)def(?1)/I
    abcdefabc

/^(a|b|c)=(?1)+/I
    a=a
    a=b
    a=bc

/^(a|b|c)=((?1))+/I
    a=a
    a=b
    a=bc

/a(?P<name1>b|c)d(?P<longername2>e)/IB
    abde
    acde

/(?:a(?P<c>c(?P<d>d)))(?P<a>a)/IB

/(?P<a>a)...(?P=a)bbb(?P>a)d/IB

/^\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
    1221
    Satan, oscillate my metallic sonatas!
    A man, a plan, a canal: Panama!
    Able was I ere I saw Elba.
\= Expect no match
    The quick brown fox

/((?(R)a|b))\1(?1)?/I
  bb
  bbaa

/(.*)a/Is

/(.*)a\1/Is

/(.*)a(b)\2/Is

/((.*)a|(.*)b)z/Is

/((.*)a|(.*)b)z\1/Is

/((.*)a|(.*)b)z\2/Is

/((.*)a|(.*)b)z\3/Is

/((.*)a|^(.*)b)z\3/Is

/(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)a/Is

/(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)a\31/Is

/(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)a\32/Is

/(a)(bc)/IB,no_auto_capture
  abc

/(?P<one>a)(bc)/IB,no_auto_capture
  abc

/(a)(?P<named>bc)/IB,no_auto_capture

/(aaa(?C1)bbb|ab)/I
   aaabbb
   aaabbb\=callout_data=0
   aaabbb\=callout_data=1
\= Expect no match
   aaabbb\=callout_data=-1

/ab(?P<one>cd)ef(?P<two>gh)/I
    abcdefgh
    abcdefgh\=copy=1,get=two
    abcdefgh\=copy=one,copy=two
    abcdefgh\=copy=three

/(?P<Tes>)(?P<Test>)/IB

/(?P<Test>)(?P<Tes>)/IB

/(?P<Z>zz)(?P<A>aa)/I
    zzaa\=copy=Z
    zzaa\=copy=A

/(?P<x>eks)(?P<x>eccs)/I

/(?P<abc>abc(?P<def>def)(?P<abc>xyz))/I

"\[((?P<elem>\d+)(,(?P>elem))*)\]"I
    [10,20,30,5,5,4,4,2,43,23,4234]
\= Expect no match
    []

"\[((?P<elem>\d+)(,(?P>elem))*)?\]"I
    [10,20,30,5,5,4,4,2,43,23,4234]
    []

/(a(b(?2)c))?/IB

/(a(b(?2)c))*/IB

/(a(b(?2)c)){0,2}/IB

/[ab]{1}+/B

/()(?1){1}/B

/()(?1)/B

/((w\/|-|with)*(free|immediate)*.*?shipping\s*[!.-]*)/Ii
     Baby Bjorn Active Carrier - With free SHIPPING!!

/((w\/|-|with)*(free|immediate)*.*?shipping\s*[!.-]*)/Ii
     Baby Bjorn Active Carrier - With free SHIPPING!!

/a*.*b/IB

/(a|b)*.?c/IB

/abc(?C255)de(?C)f/IB

/abcde/IB,auto_callout
  abcde
\= Expect no match
  abcdfe

/a*b/IB,auto_callout
  ab
  aaaab
  aaaacb

/a*b/IB,auto_callout
  ab
  aaaab
  aaaacb

/a+b/IB,auto_callout
  ab
  aaaab
\= Expect no match
  aaaacb

/(abc|def)x/IB,auto_callout
  abcx
  defx
\= Expect no match
  abcdefzx

/(abc|def)x/IB,auto_callout
  abcx
  defx
\= Expect no match
  abcdefzx

/(ab|cd){3,4}/I,auto_callout
  ababab
  abcdabcd
  abcdcdcdcdcd

/([ab]{,4}c|xy)/IB,auto_callout
\= Expect no match
    Note: that { does NOT introduce a quantifier

/([ab]{,4}c|xy)/IB,auto_callout
\= Expect no match
    Note: that { does NOT introduce a quantifier

/([ab]{1,4}c|xy){4,5}?123/IB,auto_callout
    aacaacaacaacaac123

/\b.*/I
  ab cd\=offset=1

/\b.*/Is
  ab cd\=startoffset=1

/(?!.bcd).*/I
  Xbcd12345

/abcde/I
    ab\=ps
    abc\=ps
    abcd\=ps
    abcde\=ps
    the quick brown abc\=ps
\= Expect no match\=ps
    the quick brown abxyz fox\=ps

"^(0?[1-9]|[12][0-9]|3[01])/(0?[1-9]|1[012])/(20)?\d\d$"I
    13/05/04\=ps
    13/5/2004\=ps
    02/05/09\=ps
    1\=ps
    1/2\=ps
    1/2/0\=ps
    1/2/04\=ps
    0\=ps
    02/\=ps
    02/0\=ps
    02/1\=ps
\= Expect no match\=ps
    \=ps
    123\=ps
    33/4/04\=ps
    3/13/04\=ps
    0/1/2003\=ps
    0/\=ps
    02/0/\=ps
    02/13\=ps

/0{0,2}ABC/I

/\d{3,}ABC/I

/\d*ABC/I

/[abc]+DE/I

/[abc]?123/I
    123\=ps
    a\=ps
    b\=ps
    c\=ps
    c12\=ps
    c123\=ps

/^(?:\d){3,5}X/I
    1\=ps
    123\=ps
    123X
    1234\=ps
    1234X
    12345\=ps
    12345X
\= Expect no match
    1X
    123456\=ps

"<(\w+)/?>(.)*</(\1)>"Igms
    <!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>\=jitstack=1024

/line\nbreak/I
    this is a line\nbreak
    line one\nthis is a line\nbreak in the second line

/line\nbreak/I,firstline
    this is a line\nbreak
\= Expect no match
    line one\nthis is a line\nbreak in the second line

/line\nbreak/Im,firstline
    this is a line\nbreak
\= Expect no match
    line one\nthis is a line\nbreak in the second line

/(?i)(?-i)AbCd/I
    AbCd
\= Expect no match
    abcd

/a{11111111111111111111}/I

/(){64294967295}/I

/(){2,4294967295}/I

"(?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
    abcdefghijklAkB

"(?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
    abcdefghijklAkB

"(a)(b)(c)(d)(e)(f)(g)(h)(i)(j)(k)(l)A\11B"I
    abcdefghijklAkB

"(?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
    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa

"(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
    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa

/[^()]*(?:\((?R)\)[^()]*)*/I
    (this(and)that
    (this(and)that)
    (this(and)that)stuff

/[^()]*(?:\((?>(?R))\)[^()]*)*/I
    (this(and)that
    (this(and)that)

/[^()]*(?:\((?R)\))*[^()]*/I
    (this(and)that
    (this(and)that)

/(?:\((?R)\))*[^()]*/I
    (this(and)that
    (this(and)that)
    ((this))

/(?:\((?R)\))|[^()]*/I
    (this(and)that
    (this(and)that)
    (this)
    ((this))

/\x{0000ff}/I

/^((?P<A>a1)|(?P<A>a2)b)/I

/^((?P<A>a1)|(?P<A>a2)b)/I,dupnames
    a1b\=copy=A
    a2b\=copy=A
    a1b\=copy=Z,copy=A

/(?|(?<a>)(?<b>)(?<a>)|(?<a>)(?<b>)(?<a>))/I,dupnames

/^(?P<A>a)(?P<A>b)/I,dupnames
    ab\=copy=A

/^(?P<A>a)(?P<A>b)|cd/I,dupnames
    ab\=copy=A
    cd\=copy=A

/^(?P<A>a)(?P<A>b)|cd(?P<A>ef)(?P<A>gh)/I,dupnames
    cdefgh\=copy=A

/^((?P<A>a1)|(?P<A>a2)b)/I,dupnames
    a1b\=get=A
    a2b\=get=A
    a1b\=get=Z,get=A

/^(?P<A>a)(?P<A>b)/I,dupnames
    ab\=get=A

/^(?P<A>a)(?P<A>b)|cd/I,dupnames
    ab\=get=A
    cd\=get=A

/^(?P<A>a)(?P<A>b)|cd(?P<A>ef)(?P<A>gh)/I,dupnames
    cdefgh\=get=A

/(?J)^((?P<A>a1)|(?P<A>a2)b)/I
    a1b\=copy=A
    a2b\=copy=A

/^(?P<A>a) (?J:(?P<B>b)(?P<B>c)) (?P<A>d)/I

# In this next test, J is not set at the outer level; consequently it isn't set
# in the pattern's options; consequently pcre2_substring_get_byname() produces
# a random value.

/^(?P<A>a) (?J:(?P<B>b)(?P<B>c)) (?P<C>d)/I
    a bc d\=copy=A,copy=B,copy=C

/^(?P<A>a)?(?(A)a|b)/I
    aabc
    bc
\= Expect no match
    abc

/(?:(?(ZZ)a|b)(?P<ZZ>X))+/I
    bXaX

/(?:(?(2y)a|b)(X))+/I

/(?:(?(ZA)a|b)(?P<ZZ>X))+/I

/(?:(?(ZZ)a|b)(?(ZZ)a|b)(?P<ZZ>X))+/I
    bbXaaX

/(?:(?(ZZ)a|\(b\))\\(?P<ZZ>X))+/I
    (b)\\Xa\\X

/(?P<ABC/I

/(?:(?(A)(?P=A)a|b)(?P<A>X|Y))+/I
    bXXaYYaY
    bXYaXXaX

/()()()()()()()()()(?:(?(A)(?P=A)a|b)(?P<A>X|Y))+/I
    bXXaYYaY

/\s*,\s*/I
    \x0b,\x0b
    \x0c,\x0d

/^abc/Im,newline=lf
    xyz\nabc
    xyz\r\nabc
\= Expect no match
    xyz\rabc
    xyzabc\r
    xyzabc\rpqr
    xyzabc\r\n
    xyzabc\r\npqr

/^abc/Im,newline=crlf
    xyz\r\nabclf>
\= Expect no match
    xyz\nabclf
    xyz\rabclf

/^abc/Im,newline=cr
    xyz\rabc
\= Expect no match
    xyz\nabc
    xyz\r\nabc

/^abc/Im,newline=bad

/.*/I,newline=lf
    abc\ndef
    abc\rdef
    abc\r\ndef

/.*/I,newline=cr
    abc\ndef
    abc\rdef
    abc\r\ndef

/.*/I,newline=crlf
    abc\ndef
    abc\rdef
    abc\r\ndef

/\w+(.)(.)?def/Is
    abc\ndef
    abc\rdef
    abc\r\ndef

/(?P<B>25[0-5]|2[0-4]\d|[01]?\d?\d)(?:\.(?P>B)){3}/I

/()()()()()()()()()()()()()()()()()()()()
 ()()()()()()()()()()()()()()()()()()()()
 ()()()()()()()()()()()()()()()()()()()()
 ()()()()()()()()()()()()()()()()()()()()
 ()()()()()()()()()()()()()()()()()()()()
 (.(.))/Ix
    XY\=ovector=133

/(a*b|(?i:c*(?-i)d))/I

/()[ab]xyz/I

/(|)[ab]xyz/I

/(|c)[ab]xyz/I

/(|c?)[ab]xyz/I

/(d?|c?)[ab]xyz/I

/(d?|c)[ab]xyz/I

/^a*b\d/IB

/^a*+b\d/IB

/^a*?b\d/IB

/^a+A\d/IB
    aaaA5
\= Expect no match
    aaaa5

/^a*A\d/IBi
    aaaA5
    aaaa5

/(a*|b*)[cd]/I

/(a+|b*)[cd]/I

/(a*|b+)[cd]/I

/(a+|b+)[cd]/I

/((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((
 ((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((
 (((
 a
 ))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))
 ))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))
 )))
/Ix
  large nest

/a*\d/B

/a*\D/B

/0*\d/B

/0*\D/B

/a*\s/B

/a*\S/B

/ *\s/B

/ *\S/B

/a*\w/B

/a*\W/B

/=*\w/B

/=*\W/B

/\d*a/B

/\d*2/B

/\d*\d/B

/\d*\D/B

/\d*\s/B

/\d*\S/B

/\d*\w/B

/\d*\W/B

/\D*a/B

/\D*2/B

/\D*\d/B

/\D*\D/B

/\D*\s/B

/\D*\S/B

/\D*\w/B

/\D*\W/B

/\s*a/B

/\s*2/B

/\s*\d/B

/\s*\D/B

/\s*\s/B

/\s*\S/B

/\s*\w/B

/\s*\W/B

/\S*a/B

/\S*2/B

/\S*\d/B

/\S*\D/B

/\S*\s/B

/\S*\S/B

/\S*\w/B

/\S*\W/B

/\w*a/B

/\w*2/B

/\w*\d/B

/\w*\D/B

/\w*\s/B

/\w*\S/B

/\w*\w/B

/\w*\W/B

/\W*a/B

/\W*2/B

/\W*\d/B

/\W*\D/B

/\W*\s/B

/\W*\S/B

/\W*\w/B

/\W*\W/B

/[^a]+a/B

/[^a]+a/Bi

/[^a]+A/Bi

/[^a]+b/B

/[^a]+\d/B

/a*[^a]/B

/(?P<abc>x)(?P<xyz>y)/I
    xy\=copy=abc,copy=xyz

/(?<abc>x)(?'xyz'y)/I
    xy\=copy=abc,copy=xyz

/(?<abc'x)(?'xyz'y)/I

/(?<abc>x)(?'xyz>y)/I

/(?P'abc'x)(?P<xyz>y)/I

/^(?:(?(ZZ)a|b)(?<ZZ>X))+/
    bXaX
    bXbX
\= Expect no match
    aXaX
    aXbX

/^(?P>abc)(?<abcd>xxx)/

/^(?P>abc)(?<abc>x|y)/
    xx
    xy
    yy
    yx

/^(?P>abc)(?P<abc>x|y)/
    xx
    xy
    yy
    yx

/^((?(abc)a|b)(?<abc>x|y))+/
    bxay
    bxby
\= Expect no match
    axby

/^(((?P=abc)|X)(?<abc>x|y))+/
    XxXxxx
    XxXyyx
    XxXyxx
\= Expect no match
    x

/^(?1)(abc)/
    abcabc

/^(?:(?:\1|X)(a|b))+/
    Xaaa
    Xaba

/^[\E\Qa\E-\Qz\E]+/B

/^[a\Q]bc\E]/B

/^[a-\Q\E]/B

/^(?P>abc)[()](?<abc>)/B

/^((?(abc)y)[()](?P<abc>x))+/B
    (xy)x

/^(?P>abc)\Q()\E(?<abc>)/B

/^(?P>abc)[a\Q(]\E(](?<abc>)/B

/^(?P>abc) # this is (a comment)
  (?<abc>)/Bx

/^\W*(?:(?<one>(?<two>.)\W*(?&one)\W*\k<two>|)|(?<three>(?<four>.)\W*(?&three)\W*\k'four'|\W*.\W*))\W*$/Ii
    1221
    Satan, oscillate my metallic sonatas!
    A man, a plan, a canal: Panama!
    Able was I ere I saw Elba.
\= Expect no match
    The quick brown fox

/(?=(\w+))\1:/I
    abcd:

/(?=(?'abc'\w+))\k<abc>:/I
    abcd:

/(?'abc'a|b)(?<abc>d|e)\k<abc>{2}/dupnames
    adaa
\= Expect no match
    addd
    adbb

/(?'abc'a|b)(?<abc>d|e)(?&abc){2}/dupnames
    bdaa
    bdab
\= Expect no match
    bddd

/(?(<bc))/

/(?(''))/

/(?('R')stuff)/

/((abc (?(R) (?(R1)1) (?(R2)2) X  |  (?1)  (?2)   (?R) ))) /x
    abcabc1Xabc2XabcXabcabc

/(?<A> (?'B' abc (?(R) (?(R&A)1) (?(R&B)2) X  |  (?1)  (?2)   (?R) ))) /x
    abcabc1Xabc2XabcXabcabc

/(?<A> (?'B' abc (?(R) (?(R&C)1) (?(R&B)2) X  |  (?1)  (?2)   (?R) ))) /x

/^(?(DEFINE) abc | xyz ) /x

/(?(DEFINE) abc) xyz/Ix

/(a|)*\d/
  aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa4\=ovector=0
\= Expect no match
  aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\=ovector=0

/^a.b/newline=lf
    a\rb
\= Expect no match
    a\nb

/^a.b/newline=cr
    a\nb
\= Expect no match
    a\rb

/^a.b/newline=anycrlf
    a\x85b
\= Expect no match
    a\rb

/^a.b/newline=any
\= Expect no match
    a\nb
    a\rb
    a\x85b

/^abc./gmx,newline=any
    abc1 \x0aabc2 \x0babc3xx \x0cabc4 \x0dabc5xx \x0d\x0aabc6 \x85abc7 JUNK

/abc.$/gmx,newline=any
    abc1\x0a abc2\x0b abc3\x0c abc4\x0d abc5\x0d\x0a abc6\x85 abc7 abc9

/^a\Rb/bsr=unicode
    a\nb
    a\rb
    a\r\nb
    a\x0bb
    a\x0cb
    a\x85b
\= Expect no match
    a\n\rb

/^a\R*b/bsr=unicode
    ab
    a\nb
    a\rb
    a\r\nb
    a\x0bb
    a\x0cb
    a\x85b
    a\n\rb
    a\n\r\x85\x0cb

/^a\R+b/bsr=unicode
    a\nb
    a\rb
    a\r\nb
    a\x0bb
    a\x0cb
    a\x85b
    a\n\rb
    a\n\r\x85\x0cb
\= Expect no match
    ab

/^a\R{1,3}b/bsr=unicode
    a\nb
    a\n\rb
    a\n\r\x85b
    a\r\n\r\nb
    a\r\n\r\n\r\nb
    a\n\r\n\rb
    a\n\n\r\nb
\= Expect no match
    a\n\n\n\rb
    a\r

/(?&abc)X(?<abc>P)/I
    abcPXP123

/(?1)X(?<abc>P)/I
    abcPXP123

/(?:a(?&abc)b)*(?<abc>x)/
    123axbaxbaxbx456
    123axbaxbaxb456

/(?:a(?&abc)b){1,5}(?<abc>x)/
    123axbaxbaxbx456

/(?:a(?&abc)b){2,5}(?<abc>x)/
    123axbaxbaxbx456

/(?:a(?&abc)b){2,}(?<abc>x)/
    123axbaxbaxbx456

/(abc)(?i:(?1))/
    defabcabcxyz
\= Expect no match
    DEFabcABCXYZ

/(abc)(?:(?i)(?1))/
    defabcabcxyz
\= Expect no match
    DEFabcABCXYZ

/^(a)\g-2/

/^(a)\g/

/^(a)\g{0}/

/^(a)\g{3/

/^(a)\g{aa}/

/^a.b/newline=lf
    a\rb
\= Expect no match
    a\nb

/.+foo/
    afoo
\= Expect no match
    \r\nfoo
    \nfoo

/.+foo/newline=crlf
    afoo
    \nfoo
\= Expect no match
    \r\nfoo

/.+foo/newline=any
    afoo
\= Expect no match
    \nfoo
    \r\nfoo

/.+foo/s
    afoo
    \r\nfoo
    \nfoo

/^$/gm,newline=any
    abc\r\rxyz
    abc\n\rxyz
\= Expect no match
    abc\r\nxyz

/(?m)^$/g,newline=any,aftertext
    abc\r\n\r\n

/(?m)^$|^\r\n/g,newline=any,aftertext
    abc\r\n\r\n

/(?m)$/g,newline=any,aftertext
    abc\r\n\r\n

/abc.$/gmx,newline=anycrlf
    abc1\x0a abc2\x0b abc3\x0c abc4\x0d abc5\x0d\x0a abc6\x85 abc9

/^X/m
    XABC
\= Expect no match
    XABC\=notbol

/(ab|c)(?-1)/B
    abc

/xy(?+1)(abc)/B
    xyabcabc
\= Expect no match
    xyabc

/x(?-0)y/

/x(?-1)y/

/x(?+0)y/

/x(?+1)y/

/^(abc)?(?(-1)X|Y)/B
    abcX
    Y
\= Expect no match
    abcY

/^((?(+1)X|Y)(abc))+/B
    YabcXabc
    YabcXabcXabc
\= Expect no match
    XabcXabc

/(?(-1)a)/B

/((?(-1)a))/B

/((?(-2)a))/B

/^(?(+1)X|Y)(.)/B
    Y!

/(?<A>tom|bon)-\k{A}/
    tom-tom
    bon-bon
\= Expect no match
    tom-bon

/\g{A/

/(?|(abc)|(xyz))/B
   >abc<
   >xyz<

/(x)(?|(abc)|(xyz))(x)/B
    xabcx
    xxyzx

/(x)(?|(abc)(pqr)|(xyz))(x)/B
    xabcpqrx
    xxyzx

/\H++X/B
\= Expect no match
    XXXX

/\H+\hY/B
    XXXX Y

/\H+ Y/B

/\h+A/B

/\v*B/B

/\V+\x0a/B

/A+\h/B

/ *\H/B

/A*\v/B

/\x0b*\V/B

/\d+\h/B

/\d*\v/B

/S+\h\S+\v/B

/\w{3,}\h\w+\v/B

/\h+\d\h+\w\h+\S\h+\H/B

/\v+\d\v+\w\v+\S\v+\V/B

/\H+\h\H+\d/B

/\V+\v\V+\w/B

/\( (?: [^()]* | (?R) )* \)/x
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/[\E]AAA/

/[\Q\E]AAA/

/[^\E]AAA/

/[^\Q\E]AAA/

/[\E^]AAA/

/[\Q\E^]AAA/

/A(*PRUNE)B(*SKIP)C(*THEN)D(*COMMIT)E(*F)F(*FAIL)G(?!)H(*ACCEPT)I/B

/^a+(*FAIL)/auto_callout
\= Expect no match
    aaaaaa

/a+b?c+(*FAIL)/auto_callout
\= Expect no match
    aaabccc

/a+b?(*PRUNE)c+(*FAIL)/auto_callout
\= Expect no match
    aaabccc

/a+b?(*COMMIT)c+(*FAIL)/auto_callout
\= Expect no match
    aaabccc

/a+b?(*SKIP)c+(*FAIL)/auto_callout
\= Expect no match
    aaabcccaaabccc

/a+b?(*THEN)c+(*FAIL)/auto_callout
\= Expect no match
    aaabccc

/a(*MARK)b/

/(?i:A{1,}\6666666666)/

/\g6666666666/

/[\g6666666666]/B

/(?1)\c[/

/.+A/newline=crlf
\= Expect no match
    \r\nA

/\nA/newline=crlf
    \r\nA

/[\r\n]A/newline=crlf
    \r\nA

/(\r|\n)A/newline=crlf
    \r\nA

/a(*CR)b/

/(*CR)a.b/
    a\nb
\= Expect no match
    a\rb

/(*CR)a.b/newline=lf
    a\nb
\= Expect no match
    a\rb

/(*LF)a.b/newline=CRLF
    a\rb
\= Expect no match
    a\nb

/(*CRLF)a.b/
    a\rb
    a\nb
\= Expect no match
    a\r\nb

/(*ANYCRLF)a.b/newline=CR
\= Expect no match
    a\rb
    a\nb
    a\r\nb

/(*ANY)a.b/newline=cr
\= Expect no match
    a\rb
    a\nb
    a\r\nb
    a\x85b

/(*ANY).*/g
    abc\r\ndef

/(*ANYCRLF).*/g
    abc\r\ndef

/(*CRLF).*/g
    abc\r\ndef

/(*NUL)^.*/
    a\nb\x00ccc

/(*NUL)^.*/s
    a\nb\x00ccc

/^x/m,newline=NUL
    ab\x00xy

/'#comment' 0d 0a 00 '^x\' 0a 'y'/x,newline=nul,hex
    x\nyz

/(*NUL)^X\NY/
    X\nY
    X\rY
\= Expect no match
    X\x00Y

/a\Rb/I,bsr=anycrlf
    a\rb
    a\nb
    a\r\nb
\= Expect no match
    a\x85b
    a\x0bb

/a\Rb/I,bsr=unicode
    a\rb
    a\nb
    a\r\nb
    a\x85b
    a\x0bb

/a\R?b/I,bsr=anycrlf
    a\rb
    a\nb
    a\r\nb
\= Expect no match
    a\x85b
    a\x0bb

/a\R?b/I,bsr=unicode
    a\rb
    a\nb
    a\r\nb
    a\x85b
    a\x0bb

/a\R{2,4}b/I,bsr=anycrlf
    a\r\n\nb
    a\n\r\rb
    a\r\n\r\n\r\n\r\nb
\= Expect no match
    a\x85\x85b
    a\x0b\x0bb

/a\R{2,4}b/I,bsr=unicode
    a\r\rb
    a\n\n\nb
    a\r\n\n\r\rb
    a\x85\x85b
    a\x0b\x0bb
\= Expect no match
    a\r\r\r\r\rb

/(*BSR_ANYCRLF)a\Rb/I
    a\nb
    a\rb

/(*BSR_UNICODE)a\Rb/I
    a\x85b

/(*BSR_ANYCRLF)(*CRLF)a\Rb/I
    a\nb
    a\rb

/(*CRLF)(*BSR_UNICODE)a\Rb/I
    a\x85b

/(*CRLF)(*BSR_ANYCRLF)(*CR)ab/I

/(?<a>)(?&)/

/(?<abc>)(?&a)/

/(?<a>)(?&aaaaaaaaaaaaaaaaaaaaaaa)/

/(?+-a)/

/(?-+a)/

/(?(-1))/

/(?(+10))/

/(?(10))/

/(?(+2))()()/

/(?(2))()()/

/\k''/

/\k<>/

/\k{}/

/\k/

/\kabc/

/(?P=)/

/(?P>)/

/[[:foo:]]/

/[[:1234:]]/

/[[:f\oo:]]/

/[[: :]]/

/[[:...:]]/

/[[:l\ower:]]/

/[[:abc\:]]/

/[abc[:x\]pqr:]]/

/[[:a\dz:]]/

/(^(a|b\g<-1'c))/

/^(?+1)(?<a>x|y){0}z/
    xzxx
    yzyy
\= Expect no match
    xxz

/(\3)(\1)(a)/
\= Expect no match
    cat

/(\3)(\1)(a)/alt_bsux,allow_empty_class,match_unset_backref,dupnames
    cat

/TA]/
    The ACTA] comes

/TA]/alt_bsux,allow_empty_class,match_unset_backref,dupnames
    The ACTA] comes

/(?2)[]a()b](abc)/
    abcbabc

/(?2)[^]a()b](abc)/
    abcbabc

/(?1)[]a()b](abc)/
    abcbabc
\= Expect no match
    abcXabc

/(?1)[^]a()b](abc)/
    abcXabc
\= Expect no match
    abcbabc

/(?2)[]a()b](abc)(xyz)/
    xyzbabcxyz

/(?&N)[]a(?<N>)](?<M>abc)/
   abc<abc

/(?&N)[]a(?<N>)](abc)/
   abc<abc

/a[]b/

/a[^]b/

/a[]b/alt_bsux,allow_empty_class,match_unset_backref,dupnames
\= Expect no match
    ab

/a[]+b/alt_bsux,allow_empty_class,match_unset_backref,dupnames
\= Expect no match
    ab

/a[]*+b/alt_bsux,allow_empty_class,match_unset_backref,dupnames
\= Expect no match
    ab

/a[^]b/alt_bsux,allow_empty_class,match_unset_backref,dupnames
    aXb
    a\nb
\= Expect no match
    ab

/a[^]+b/alt_bsux,allow_empty_class,match_unset_backref,dupnames
    aXb
    a\nX\nXb
\= Expect no match
    ab

/a(?!)b/B

/(?!)?a/B
    ab

/a(*FAIL)+b/

/(abc|pqr|123){0}[xyz]/I

/(?(?=.*b)b|^)/I,auto_callout
   adc
   abc

/(?(?=b).*b|^d)/I

/(?(?=.*b).*b|^d)/I

/xyz/auto_callout
  xyz
  abcxyz
\= Expect no match
  abc
  abcxypqr

/xyz/auto_callout,no_start_optimize
  abcxyz
\= Expect no match
  abc
  abcxypqr

/(*NO_START_OPT)xyz/auto_callout
  abcxyz

/(*NO_AUTO_POSSESS)a+b/B

/xyz/auto_callout,no_start_optimize
  abcxyz

/^"((?(?=[a])[^"])|b)*"$/auto_callout
    "ab"

/^"((?(?=[a])[^"])|b)*"$/
    "ab"

/^X(?5)(a)(?|(b)|(q))(c)(d)Y/
    XYabcdY

/^X(?&N)(a)(?|(b)|(q))(c)(d)(?<N>Y)/
    XYabcdY

/Xa{2,4}b/
    X\=ps
    Xa\=ps
    Xaa\=ps
    Xaaa\=ps
    Xaaaa\=ps

/Xa{2,4}?b/
    X\=ps
    Xa\=ps
    Xaa\=ps
    Xaaa\=ps
    Xaaaa\=ps

/Xa{2,4}+b/
    X\=ps
    Xa\=ps
    Xaa\=ps
    Xaaa\=ps
    Xaaaa\=ps

/X\d{2,4}b/
    X\=ps
    X3\=ps
    X33\=ps
    X333\=ps
    X3333\=ps

/X\d{2,4}?b/
    X\=ps
    X3\=ps
    X33\=ps
    X333\=ps
    X3333\=ps

/X\d{2,4}+b/
    X\=ps
    X3\=ps
    X33\=ps
    X333\=ps
    X3333\=ps

/X\D{2,4}b/
    X\=ps
    Xa\=ps
    Xaa\=ps
    Xaaa\=ps
    Xaaaa\=ps

/X\D{2,4}?b/
    X\=ps
    Xa\=ps
    Xaa\=ps
    Xaaa\=ps
    Xaaaa\=ps

/X\D{2,4}+b/
    X\=ps
    Xa\=ps
    Xaa\=ps
    Xaaa\=ps
    Xaaaa\=ps

/X[abc]{2,4}b/
    X\=ps
    Xa\=ps
    Xaa\=ps
    Xaaa\=ps
    Xaaaa\=ps

/X[abc]{2,4}?b/
    X\=ps
    Xa\=ps
    Xaa\=ps
    Xaaa\=ps
    Xaaaa\=ps

/X[abc]{2,4}+b/
    X\=ps
    Xa\=ps
    Xaa\=ps
    Xaaa\=ps
    Xaaaa\=ps

/X[^a]{2,4}b/
    X\=ps
    Xz\=ps
    Xzz\=ps
    Xzzz\=ps
    Xzzzz\=ps

/X[^a]{2,4}?b/
    X\=ps
    Xz\=ps
    Xzz\=ps
    Xzzz\=ps
    Xzzzz\=ps

/X[^a]{2,4}+b/
    X\=ps
    Xz\=ps
    Xzz\=ps
    Xzzz\=ps
    Xzzzz\=ps

/(Y)X\1{2,4}b/
    YX\=ps
    YXY\=ps
    YXYY\=ps
    YXYYY\=ps
    YXYYYY\=ps

/(Y)X\1{2,4}?b/
    YX\=ps
    YXY\=ps
    YXYY\=ps
    YXYYY\=ps
    YXYYYY\=ps

/(Y)X\1{2,4}+b/
    YX\=ps
    YXY\=ps
    YXYY\=ps
    YXYYY\=ps
    YXYYYY\=ps

/\++\KZ|\d+X|9+Y/startchar
    ++++123999\=ps
    ++++123999Y\=ps
    ++++Z1234\=ps

/Z(*F)/
\= Expect no match
    Z\=ps
    ZA\=ps

/Z(?!)/
\= Expect no match
    Z\=ps
    ZA\=ps

/dog(sbody)?/
    dogs\=ps
    dogs\=ph

/dog(sbody)??/
    dogs\=ps
    dogs\=ph

/dog|dogsbody/
    dogs\=ps
    dogs\=ph

/dogsbody|dog/
    dogs\=ps
    dogs\=ph

/\bthe cat\b/
    the cat\=ps
    the cat\=ph

/abc/
   abc\=ps
   abc\=ph

/abc\K123/startchar
    xyzabc123pqr
    xyzabc12\=ps
    xyzabc12\=ph

/(?<=abc)123/
    xyzabc123pqr
    xyzabc12\=ps
    xyzabc12\=ph

/\babc\b/
    +++abc+++
    +++ab\=ps
    +++ab\=ph

/(?&word)(?&element)(?(DEFINE)(?<element><[^m][^>]>[^<])(?<word>\w*+))/B

/(?&word)(?&element)(?(DEFINE)(?<element><[^\d][^>]>[^<])(?<word>\w*+))/B

/(ab)(x(y)z(cd(*ACCEPT)))pq/B

/abc\K/aftertext,startchar
    abcdef
    abcdef\=notempty_atstart
    xyzabcdef\=notempty_atstart
\= Expect no match
    abcdef\=notempty
    xyzabcdef\=notempty

/^(?:(?=abc)|abc\K)/aftertext,startchar
    abcdef
    abcdef\=notempty_atstart
\= Expect no match
    abcdef\=notempty

/a?b?/aftertext
    xyz
    xyzabc
    xyzabc\=notempty
    xyzabc\=notempty_atstart
    xyz\=notempty_atstart
\= Expect no match
    xyz\=notempty

/^a?b?/aftertext
    xyz
    xyzabc
\= Expect no match
    xyzabc\=notempty
    xyzabc\=notempty_atstart
    xyz\=notempty_atstart
    xyz\=notempty

/^(?<name>a|b\g<name>c)/
    aaaa
    bacxxx
    bbaccxxx
    bbbacccxx

/^(?<name>a|b\g'name'c)/
    aaaa
    bacxxx
    bbaccxxx
    bbbacccxx

/^(a|b\g<1>c)/
    aaaa
    bacxxx
    bbaccxxx
    bbbacccxx

/^(a|b\g'1'c)/
    aaaa
    bacxxx
    bbaccxxx
    bbbacccxx

/^(a|b\g'-1'c)/
    aaaa
    bacxxx
    bbaccxxx
    bbbacccxx

/(^(a|b\g<-1>c))/
    aaaa
    bacxxx
    bbaccxxx
    bbbacccxx

/(?-i:\g<name>)(?i:(?<name>a))/
    XaaX
    XAAX

/(?i:\g<name>)(?-i:(?<name>a))/
    XaaX
\= Expect no match
    XAAX

/(?-i:\g<+1>)(?i:(a))/
    XaaX
    XAAX

/(?=(?<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
   accccbbb

/^X(?7)(a)(?|(b)|(q)(r)(s))(c)(d)(Y)/
    XYabcdY

/(?<=b(?1)|zzz)(a)/
    xbaax
    xzzzax

/(a)(?<=b\1)/

/(a)(?<=b+(?1))/

/(a+)(?<=b(?1))/

/(a(?<=b(?1)))/

/(?<=b(?1))xyz/

/(?<=b(?1))xyz(b+)pqrstuvew/

/(a|bc)\1/I

/(a|bc)\1{2,3}/I

/(a|bc)(?1)/I

/(a|b\1)(a|b\1)/I

/(a|b\1){2}/I

/(a|bbbb\1)(a|bbbb\1)/I

/(a|bbbb\1){2}/I

/^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]/I

/<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>/Iis

"(?>.*/)foo"I

/(?(?=[^a-z]+[a-z])  \d{2}-[a-z]{3}-\d{2}  |  \d{2}-\d{2}-\d{2} ) /Ix

/(?:(?:(?:(?:(?:(?:(?:(?:(?:(a|b|c))))))))))/Ii

/(?:c|d)(?:)(?:aaaaaaaa(?:)(?:bbbbbbbb)(?:bbbbbbbb(?:))(?:bbbbbbbb(?:)(?:bbbbbbbb)))/I

/<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
/Iisx

/^(?!:)                       # 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
  /Iix

/(?|(?<a>A)|(?<a>B))/I
    AB\=copy=a
    BA\=copy=a

/(?|(?<a>A)|(?<b>B))/

/(?:a(?<quote> (?<apostrophe>')|(?<realquote>")) |
    b(?<quote> (?<apostrophe>')|(?<realquote>")) )
    (?('quote')[a-z]+|[0-9]+)/Ix,dupnames
    a"aaaaa
    b"aaaaa
\= Expect no match
    b"11111
    a"11111

/^(?|(a)(b)(c)(?<D>d)|(?<D>e)) (?('D')X|Y)/IBx,dupnames
    abcdX
    eX
\= Expect no match
    abcdY
    ey

/(?<A>a) (b)(c)  (?<A>d  (?(R&A)$ | (?4)) )/IBx,dupnames
    abcdd
\= Expect no match
    abcdde

/abcd*/
    xxxxabcd\=ps
    xxxxabcd\=ph

/abcd*/i
    xxxxabcd\=ps
    xxxxabcd\=ph
    XXXXABCD\=ps
    XXXXABCD\=ph

/abc\d*/
    xxxxabc1\=ps
    xxxxabc1\=ph

/(a)bc\1*/
    xxxxabca\=ps
    xxxxabca\=ph

/abc[de]*/
    xxxxabcde\=ps
    xxxxabcde\=ph

/(\3)(\1)(a)/alt_bsux,allow_empty_class,match_unset_backref,dupnames
    cat

/(\3)(\1)(a)/I,alt_bsux,allow_empty_class,match_unset_backref,dupnames
    cat

/(\3)(\1)(a)/I
\= Expect no match
    cat

/i(?(DEFINE)(?<s>a))/I
    i

/()i(?(1)a)/I
    ia

/(?i)a(?-i)b|c/B
    XabX
    XAbX
    CcC
\= Expect no match
    XABX

/(?i)a(?s)b|c/B

/(?i)a(?s-i)b|c/B

/^(ab(c\1)d|x){2}$/B
    xabcxd

/^(?&t)*+(?(DEFINE)(?<t>.))$/B

/^(?&t)*(?(DEFINE)(?<t>.))$/B

# 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\=startchar

/(?P<L1>(?P<L2>0|)|(?P>L2)(?P>L1))/
    abcd
    0abc

/abc(*MARK:)pqr/

/abc(*:)pqr/

/abc(*FAIL:123)xyz/

# 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/aftertext,mark
\= Expect no match
    ACABX

# These should be different, but in Perl they are not, which I think
# is a bug in Perl.

/A(*THEN)B|A(*THEN)C/mark
    AC

/A(*PRUNE)B|A(*PRUNE)C/mark
\= Expect no match
    AC

# Mark names can be duplicated. Perl doesn't give a mark for this one,
# though PCRE2 does.

/^A(*:A)B|^X(*:A)Y/mark
\= Expect no match
    XAQQ

# COMMIT at the start of a pattern should be the same as an anchor. Perl
# optimizations defeat this. So does the PCRE2 optimization unless we disable
# it.

/(*COMMIT)ABC/
    ABCDEFG

/(*COMMIT)ABC/no_start_optimize
\= Expect no match
    DEFGABC

/^(ab (c+(*THEN)cd) | xyz)/x
\= Expect no match
    abcccd

/^(ab (c+(*PRUNE)cd) | xyz)/x
\= Expect no match
    abcccd

/^(ab (c+(*FAIL)cd) | xyz)/x
\= Expect no match
    abcccd

# Perl gets some of these wrong

/(?>.(*ACCEPT))*?5/
    abcde

/(.(*ACCEPT))*?5/
    abcde

/(.(*ACCEPT))5/
    abcde

/(.(*ACCEPT))*5/
    abcde

/A\NB./B
    ACBD
\= Expect no match
    A\nB
    ACB\n

/A\NB./Bs
    ACBD
    ACB\n
\= Expect no match
    A\nB

/A\NB/newline=crlf
    A\nB
    A\rB
\= Expect no match
    A\r\nB

/\R+b/B

/\R+\n/B

/\R+\d/B

/\d*\R/B

/\s*\R/B
    \x20\x0a
    \x20\x0d
    \x20\x0d\x0a

/\S*\R/B
    a\x0a

/X\h*\R/B
    X\x20\x0a

/X\H*\R/B
    X\x0d\x0a

/X\H+\R/B
    X\x0d\x0a

/X\H++\R/B
\= Expect no match
    X\x0d\x0a

/(?<=abc)def/
    abc\=ph

/abc$/
    abc
    abc\=ps
    abc\=ph

/abc$/m
    abc
    abc\n
    abc\=ph
    abc\n\=ph
    abc\=ps
    abc\n\=ps

/abc\z/
    abc
    abc\=ps
    abc\=ph

/abc\Z/
    abc
    abc\=ps
    abc\=ph

/abc\b/
    abc
    abc\=ps
    abc\=ph

/abc\B/
    abc\=ps
    abc\=ph
\= Expect no match
    abc

/.+/
\= Bad offsets
    abc\=offset=4
    abc\=offset=-4
\= Valid data
    abc\=offset=0
    abc\=offset=1
    abc\=offset=2
\= Expect no match
    abc\=offset=3

/^\cģ/

/(?P<abn>(?P=abn)xxx)/B

/(a\1z)/B

/(?P<abn>(?P=abn)(?<badstufxxx)/B

/(?P<abn>(?P=axn)xxx)/B

/(?P<abn>(?P=axn)xxx)(?<axn>yy)/B

# These tests are here because Perl gets the first one wrong.

/(\R*)(.)/s
    \r\n
    \r\r\n\n\r
    \r\r\n\n\r\n

/(\R)*(.)/s
    \r\n
    \r\r\n\n\r
    \r\r\n\n\r\n

/((?>\r\n|\n|\x0b|\f|\r|\x85)*)(.)/s
    \r\n
    \r\r\n\n\r
    \r\r\n\n\r\n

# -------------

/^abc$/B

/^abc$/Bm

/^(a)*+(\w)/
    aaaaX
\= Expect no match
    aaaa

/^(?:a)*+(\w)/
    aaaaX
\= Expect no match
    aaaa

/(a)++1234/IB

/([abc])++1234/I

/(?<=(abc)+)X/

/(^ab)/I

/(^ab)++/I

/(^ab|^)+/I

/(^ab|^)++/I

/(?:^ab)/I

/(?:^ab)++/I

/(?:^ab|^)+/I

/(?:^ab|^)++/I

/(.*ab)/I

/(.*ab)++/I

/(.*ab|.*)+/I

/(.*ab|.*)++/I

/(?:.*ab)/I

/(?:.*ab)++/I

/(?:.*ab|.*)+/I

/(?:.*ab|.*)++/I

/(?=a)[bcd]/I

/((?=a))[bcd]/I

/((?=a))+[bcd]/I

/((?=a))++[bcd]/I

/(?=a+)[bcd]/Ii

/(?=a+?)[bcd]/Ii

/(?=a++)[bcd]/Ii

/(?=a{3})[bcd]/Ii

/(abc)\1+/

# Perl doesn't get these right IMO (the 3rd is PCRE2-specific)

/(?1)(?:(b(*ACCEPT))){0}/
    b

/(?1)(?:(b(*ACCEPT))){0}c/
    bc
\= Expect no match
    b

/(?1)(?:((*ACCEPT))){0}c/
    c
    c\=notempty

/^.*?(?(?=a)a|b(*THEN)c)/
\= Expect no match
    ba

/^.*?(?(?=a)a|bc)/
    ba

/^.*?(?(?=a)a(*THEN)b|c)/
\= Expect no match
    ac

/^.*?(?(?=a)a(*THEN)b)c/
\= Expect no match
    ac

/^.*?(a(*THEN)b)c/
\= Expect no match
    aabc

/^.*? (?1) c (?(DEFINE)(a(*THEN)b))/x
    aabc

/^.*?(a(*THEN)b|z)c/
    aabc

/^.*?(z|a(*THEN)b)c/
    aabc

# These are here because they are not Perl-compatible; the studying means the
# mark is not seen.

/(*MARK:A)(*SKIP:B)(C|X)/mark
    C
\= Expect no match
    D

/(*:A)A+(*SKIP:A)(B|Z)/mark
\= Expect no match
    AAAC

# ----------------------------

"(?=a*(*ACCEPT)b)c"
    c
    c\=notempty

/(?1)c(?(DEFINE)((*ACCEPT)b))/
    c
    c\=notempty

/(?>(*ACCEPT)b)c/
    c
\= Expect no match
    c\=notempty

/(?:(?>(a)))+a%/allaftertext
    %aa%

/(a)b|ac/allaftertext
    ac\=ovector=1

/(a)(b)x|abc/allaftertext
     abc\=ovector=2

/(a)bc|(a)(b)\2/
    abc\=ovector=1
    abc\=ovector=2
    aba\=ovector=1
    aba\=ovector=2
    aba\=ovector=3
    aba\=ovector=4

/(?(DEFINE)(a(?2)|b)(b(?1)|a))(?:(?1)|(?2))/I

/(a(?2)|b)(b(?1)|a)(?:(?1)|(?2))/I

/(a(?2)|b)(b(?1)|a)(?1)(?2)/I

/(abc)(?1)/I

/(?:(foo)|(bar)|(baz))X/allcaptures
    bazfooX
    foobazbarX
    barfooX
    bazX
    foobarbazX
    bazfooX\=ovector=0
    bazfooX\=ovector=1
    bazfooX\=ovector=2
    bazfooX\=ovector=3

/(?=abc){3}abc/B

/(?=abc)+abc/B

/(?=abc)++abc/B

/(?=abc){0}xyz/B

/(?=(a))?./B

/(?=(a))??./B

/^(?=(a)){0}b(?1)/B

/(?(DEFINE)(a))?b(?1)/B

/^(?=(?1))?[az]([abc])d/B

/^(?!a){0}\w+/B

/(?<=(abc))?xyz/B

/[:a[:abc]b:]/B

/^(a(*:A)(d|e(*:B))z|aeq)/auto_callout
    adz
    aez
    aeqwerty

/.(*F)/
\= Expect no match
    abc\=ph

/\btype\b\W*?\btext\b\W*?\bjavascript\b/I

/\btype\b\W*?\btext\b\W*?\bjavascript\b|\burl\b\W*?\bshell:|<input\b.*?\btype\b\W*?\bimage\b|\bonkeyup\b\W*?\=/I

/a(*SKIP)c|b(*ACCEPT)|/I,aftertext
    a

/a(*SKIP)c|b(*ACCEPT)cd(*ACCEPT)|x/I
    ax

'a*(*ACCEPT)b'aftertext
    abc\=notempty_atstart
    bbb\=notempty_atstart
\= Expect no match
    \=notempty_atstart

/(*ACCEPT)a/I,aftertext
    bax

/z(*ACCEPT)a/I,aftertext
    baxzbx

/^(?>a+)(?>(z+))\w/B
    aaaazzzzb
\= Expect no match
    aazz

/(.)(\1|a(?2))/
    bab

/\1|(.)(?R)\1/
    cbbbc

/(.)((?(1)c|a)|a(?2))/
\= Expect no match
    baa

/(?P<abn>(?P=abn)xxx)/B

/(a\1z)/B

/^a\x41z/alt_bsux,allow_empty_class,match_unset_backref,dupnames
    aAz
\= Expect no match
    ax41z

/^a[m\x41]z/alt_bsux,allow_empty_class,match_unset_backref,dupnames
    aAz

/^a\x1z/alt_bsux,allow_empty_class,match_unset_backref,dupnames
    ax1z

/^a\u0041z/alt_bsux,allow_empty_class,match_unset_backref,dupnames
    aAz
\= Expect no match
    au0041z

/^a[m\u0041]z/alt_bsux,allow_empty_class,match_unset_backref,dupnames
    aAz

/^a\u041z/alt_bsux,allow_empty_class,match_unset_backref,dupnames
    au041z
\= Expect no match
    aAz

/^a\U0041z/alt_bsux,allow_empty_class,match_unset_backref,dupnames
    aU0041z
\= Expect no match
    aAz

/(?(?=c)c|d)++Y/B

/(?(?=c)c|d)*+Y/B

/a[\NB]c/
    aNc

/a[B-\Nc]/

/a[B\Nc]/

/(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 PCRE2 there is a tag.

/(A|P)(*:A)(B|P) | (X|P)(X|P)(*:B)(Y|P)/x,mark
    AABC
    XXYZ
\= Expect no match
    XAQQ
    XAQQXZZ
    AXQQQ
    AXXQQQ

# 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/mark
    aw
\= Expect no match
    abc

/(q|b)(*:m)f|a(*:n)w/mark
    aw
\= Expect no match
    abc

# After a partial match, the behaviour is as for a failure.

/^a(*:X)bcde/mark
   abc\=ps

# These are here because Perl doesn't return a mark, except for the first.

/(?=(*:x))(q|)/aftertext,mark
    abc

/(?=(*:x))((*:y)q|)/aftertext,mark
    abc

/(?=(*:x))(?:(*:y)q|)/aftertext,mark
    abc

/(?=(*:x))(?>(*:y)q|)/aftertext,mark
    abc

/(?=a(*:x))(?!a(*:y)c)/aftertext,mark
    ab

/(?=a(*:x))(?=a(*:y)c|)/aftertext,mark
    ab

/(..)\1/
    ab\=ps
    aba\=ps
    abab\=ps

/(..)\1/i
    ab\=ps
    abA\=ps
    aBAb\=ps

/(..)\1{2,}/
    ab\=ps
    aba\=ps
    abab\=ps
    ababa\=ps
    ababab\=ps
    ababab\=ph
    abababa\=ps
    abababa\=ph

/(..)\1{2,}/i
    ab\=ps
    aBa\=ps
    aBAb\=ps
    AbaBA\=ps
    abABAb\=ps
    aBAbaB\=ph
    abABabA\=ps
    abaBABa\=ph

/(..)\1{2,}?x/i
    ab\=ps
    abA\=ps
    aBAb\=ps
    abaBA\=ps
    abAbaB\=ps
    abaBabA\=ps
    abAbABaBx\=ps

/^(..)\1/
    aba\=ps

/^(..)\1{2,3}x/
    aba\=ps
    ababa\=ps
    ababa\=ph
    abababx
    ababababx

/^(..)\1{2,3}?x/
    aba\=ps
    ababa\=ps
    ababa\=ph
    abababx
    ababababx

/^(..)(\1{2,3})ab/
    abababab

/^\R/
    \r\=ps
    \r\=ph

/^\R{2,3}x/
    \r\=ps
    \r\=ph
    \r\r\=ps
    \r\r\=ph
    \r\r\r\=ps
    \r\r\r\=ph
    \r\rx
    \r\r\rx

/^\R{2,3}?x/
    \r\=ps
    \r\=ph
    \r\r\=ps
    \r\r\=ph
    \r\r\r\=ps
    \r\r\r\=ph
    \r\rx
    \r\r\rx

/^\R?x/
    \r\=ps
    \r\=ph
    x
    \rx

/^\R+x/
    \r\=ps
    \r\=ph
    \r\n\=ps
    \r\n\=ph
    \rx

/^a$/newline=crlf
    a\r\=ps
    a\r\=ph

/^a$/m,newline=crlf
    a\r\=ps
    a\r\=ph

/^(a$|a\r)/newline=crlf
    a\r\=ps
    a\r\=ph

/^(a$|a\r)/m,newline=crlf
    a\r\=ps
    a\r\=ph

/./newline=crlf
    \r\=ps
    \r\=ph

/.{2,3}/newline=crlf
    \r\=ps
    \r\=ph
    \r\r\=ps
    \r\r\=ph
    \r\r\r\=ps
    \r\r\r\=ph

/.{2,3}?/newline=crlf
    \r\=ps
    \r\=ph
    \r\r\=ps
    \r\r\=ph
    \r\r\r\=ps
    \r\r\r\=ph

"AB(C(D))(E(F))?(?(?=\2)(?=\4))"
    ABCDGHI\=ovector=01

# 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

/(?:.*?a)(?<=ba)/I

/.*?a(*PRUNE)b/I

/.*?a(*PRUNE)b/Is

/^a(*PRUNE)b/Is

/.*?a(*SKIP)b/I

/(?>.*?a)b/Is

/(?>.*?a)b/I

/(?>^a)b/Is

/(?>.*?)(?<=(abcd)|(wxyz))/I

/(?>.*)(?<=(abcd)|(wxyz))/I

"(?>.*)foo"I

"(?>.*?)foo"I

/(?>^abc)/Im

/(?>.*abc)/Im

/(?:.*abc)/Im

/(?:(a)+(?C1)bb|aa(?C2)b)/
    aab\=callout_capture

/(?:(a)++(?C1)bb|aa(?C2)b)/
    aab\=callout_capture

/(?:(?>(a))(?C1)bb|aa(?C2)b)/
    aab\=callout_capture

/(?:(?1)(?C1)x|ab(?C2))((a)){0}/
    aab\=callout_capture

/(?1)(?C1)((a)(?C2)){0}/
    aab\=callout_capture

/(?:(a)+(?C1)bb|aa(?C2)b)++/
    aab\=callout_capture
    aab\=callout_capture,ovector=1

/(ab)x|ab/
    ab\=ovector=0
    ab\=ovector=1

/(?<=123)(*MARK:xx)abc/mark
    xxxx123a\=ph
    xxxx123a\=ps

/123\Kabc/startchar
    xxxx123a\=ph
    xxxx123a\=ps

/^(?(?=a)aa|bb)/auto_callout
    bb

/(?C1)^(?C2)(?(?C99)(?=(?C3)a(?C4))(?C5)a(?C6)a(?C7)|(?C8)b(?C9)b(?C10))(?C11)/
    bb

# Perl seems to have a bug with this one.

/aaaaa(*COMMIT)(*PRUNE)b|a+c/
    aaaaaac

# Here are some that Perl treats differently because of the way it handles
# backtracking verbs.

/(?!a(*COMMIT)b)ac|ad/
     ac
     ad

/^(?!a(*THEN)b|ac)../
     ad
\= Expect no match
     ac

/^(?=a(*THEN)b|ac)/
    ac

/\A.*?(?:a|b(*THEN)c)/
    ba

/\A.*?(?:a|b(*THEN)c)++/
    ba

/\A.*?(?:a|b(*THEN)c|d)/
    ba

/(?:(a(*MARK:X)a+(*SKIP:X)b)){0}(?:(?1)|aac)/
    aac

/\A.*?(a|b(*THEN)c)/
    ba

/^(A(*THEN)B|A(*THEN)D)/
    AD

/(?!b(*THEN)a)bn|bnn/
    bnn

/(?(?=b(*SKIP)a)bn|bnn)/
    bnn

/(?=b(*THEN)a|)bn|bnn/
    bnn

# This test causes a segfault with Perl 5.18.0

/^(?=(a)){0}b(?1)/
    backgammon

/(?|(?<n>f)|(?<n>b))/I,dupnames

/(?<a>abc)(?<a>z)\k<a>()/IB,dupnames

/a*[bcd]/B

/[bcd]*a/B

# A complete set of tests for auto-possessification of character types, but
# omitting \C because it might be disabled (it has its own tests).

/\D+\D \D+\d \D+\S \D+\s \D+\W \D+\w \D+. \D+\R \D+\H \D+\h \D+\V \D+\v \D+\Z \D+\z \D+$/Bx

/\d+\D \d+\d \d+\S \d+\s \d+\W \d+\w \d+. \d+\R \d+\H \d+\h \d+\V \d+\v \d+\Z \d+\z \d+$/Bx

/\S+\D \S+\d \S+\S \S+\s \S+\W \S+\w \S+. \S+\R \S+\H \S+\h \S+\V \S+\v \S+\Z \S+\z \S+$/Bx

/\s+\D \s+\d \s+\S \s+\s \s+\W \s+\w \s+. \s+\R \s+\H \s+\h \s+\V \s+\v \s+\Z \s+\z \s+$/Bx

/\W+\D \W+\d \W+\S \W+\s \W+\W \W+\w \W+. \W+\R \W+\H \W+\h \W+\V \W+\v \W+\Z \W+\z \W+$/Bx

/\w+\D \w+\d \w+\S \w+\s \w+\W \w+\w \w+. \w+\R \w+\H \w+\h \w+\V \w+\v \w+\Z \w+\z \w+$/Bx

/\R+\D \R+\d \R+\S \R+\s \R+\W \R+\w \R+. \R+\R \R+\H \R+\h \R+\V \R+\v \R+\Z \R+\z \R+$/Bx

/\H+\D \H+\d \H+\S \H+\s \H+\W \H+\w \H+. \H+\R \H+\H \H+\h \H+\V \H+\v \H+\Z \H+\z \H+$/Bx

/\h+\D \h+\d \h+\S \h+\s \h+\W \h+\w \h+. \h+\R \h+\H \h+\h \h+\V \h+\v \h+\Z \h+\z \h+$/Bx

/\V+\D \V+\d \V+\S \V+\s \V+\W \V+\w \V+. \V+\R \V+\H \V+\h \V+\V \V+\v \V+\Z \V+\z \V+$/Bx

/\v+\D \v+\d \v+\S \v+\s \v+\W \v+\w \v+. \v+\R \v+\H \v+\h \v+\V \v+\v \v+\Z \v+\z \v+$/Bx

/ a+\D  a+\d  a+\S  a+\s  a+\W  a+\w  a+.  a+\R  a+\H  a+\h  a+\V  a+\v  a+\Z  a+\z  a+$/Bx

/\n+\D \n+\d \n+\S \n+\s \n+\W \n+\w \n+. \n+\R \n+\H \n+\h \n+\V \n+\v \n+\Z \n+\z \n+$/Bx

/ .+\D  .+\d  .+\S  .+\s  .+\W  .+\w  .+.  .+\R  .+\H  .+\h  .+\V  .+\v  .+\Z  .+\z  .+$/Bx

/ .+\D  .+\d  .+\S  .+\s  .+\W  .+\w  .+.  .+\R  .+\H  .+\h  .+\V  .+\v  .+\Z  .+\z  .+$/Bsx

/ \D+$  \d+$  \S+$  \s+$  \W+$  \w+$  \R+$  \H+$  \h+$  \V+$ \v+$  a+$   \n+$  .+$  .+$/Bmx

/(?=a+)a(a+)++a/B

/a+(bb|cc)a+(?:bb|cc)a+(?>bb|cc)a+(?:bb|cc)+a+(aa)a+(?:bb|aa)/B

/a+(bb|cc)?#a+(?:bb|cc)??#a+(?:bb|cc)?+#a+(?:bb|cc)*#a+(bb|cc)?a#a+(?:aa)?/B

/a+(?:bb)?a#a+(?:|||)#a+(?:|b)a#a+(?:|||)?a/B

/[ab]*/B
    aaaa

/[ab]*?/B
    aaaa

/[ab]?/B
    aaaa

/[ab]??/B
    aaaa

/[ab]+/B
    aaaa

/[ab]+?/B
    aaaa

/[ab]{2,3}/B
    aaaa

/[ab]{2,3}?/B
    aaaa

/[ab]{2,}/B
    aaaa

/[ab]{2,}?/B
    aaaa

/\d+\s{0,5}=\s*\S?=\w{0,4}\W*/B

/[a-d]{5,12}[e-z0-9]*#[^a-z]+[b-y]*a[2-7]?[^0-9a-z]+/B

/[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/B

/a+(aa|bb)*c#a*(bb|cc)*a#a?(bb|cc)*d#[a-f]*(g|hh)*f/B

/[a-f]*(g|hh|i)*i#[a-x]{4,}(y{0,6})*y#[a-k]+(ll|mm)+n/B

/[a-f]*(?>gg|hh)+#[a-f]*(?>gg|hh)?#[a-f]*(?>gg|hh)*a#[a-f]*(?>gg|hh)*h/B

/[a-c]*d/IB

/[a-c]+d/IB

/[a-c]?d/IB

/[a-c]{4,6}d/IB

/[a-c]{0,6}d/IB

# End of special auto-possessive tests

/^A\o{1239}B/
    A\123B

/^A\oB/

/^A\x{zz}B/

/^A\x{12Z/

/^A\x{/

/[ab]++/B,no_auto_possess

/[^ab]*+/B,no_auto_possess

/a{4}+/B,no_auto_possess

/a{4}+/Bi,no_auto_possess

/[a-[:digit:]]+/

/[A-[:digit:]]+/

/[a-[.xxx.]]+/

/[a-[=xxx=]]+/

/[a-[!xxx!]]+/

/[A-[!xxx!]]+/
    A]]]

/[a-\d]+/

/(?<0abc>xx)/

/(?&1abc)xx(?<1abc>y)/

/(?<ab-cd>xx)/

/(?'0abc'xx)/

/(?P<0abc>xx)/

/\k<5ghj>/

/\k'5ghj'/

/\k{2fgh}/

/(?P=8yuki)/

/\g{4df}/

/(?&1abc)xx(?<1abc>y)/

/(?P>1abc)xx(?<1abc>y)/

/\g'3gh'/

/\g<5fg>/

/(?(<4gh>)abc)/

/(?('4gh')abc)/

/(?(4gh)abc)/

/(?(R&6yh)abc)/

/(((a\2)|(a*)\g<-1>))*a?/B

# Test the ugly "start or end of word" compatibility syntax.

/[[:<:]]red[[:>:]]/B
    little red riding hood
    a /red/ thing
    red is a colour
    put it all on red
\= Expect no match
    no reduction
    Alfred Winifred

/[a[:<:]] should give error/

/(?=ab\K)/aftertext
    abcd\=startchar

/abcd/newline=lf,firstline
\= Expect no match
    xx\nxabcd

# Test stack guard external calls.

/(((a)))/stackguard=1

/(((a)))/stackguard=2

/(((a)))/stackguard=3

/(((((a)))))/

# End stack guard tests

/^\w+(?>\s*)(?<=\w)/B

/\othing/

/\o{}/

/\o{whatever}/

/\xthing/

/\x{}/

/\x{whatever}/

/A\8B/

/A\9B/

# This one is here because Perl fails to match "12" for this pattern when the $
# is present.

/^(?(?=abc)\w{3}:|\d\d)$/
    abc:
    12
\= Expect no match
    123
    xyz

# Perl gets this one wrong, giving "a" as the after text for ca and failing to
# match for cd.

/(?(?=ab)ab)/aftertext
    abxxx
    ca
    cd

# This should test both paths for processing OP_RECURSE.

/(?(R)a+|(?R)b)/
    aaaabcde
    aaaabcde\=ovector=100

/a*?b*?/
    ab

/(*NOTEMPTY)a*?b*?/
    ab
    ba
    cb

/(*NOTEMPTY_ATSTART)a*?b*?/aftertext
    ab
    cdab

/(?(VERSION>=10.0)yes|no)/I
    yesno

/(?(VERSION=8)yes){3}/BI,aftertext
    yesno

/(?(VERSION=8)yes|no){3}/I
    yesnononoyes
\= Expect no match
    yesno

/(?:(?<VERSION>abc)|xyz)(?(VERSION)yes|no)/I
    abcyes
    xyzno
\= Expect no match
    abcno
    xyzyes

/(?(VERSION<10)yes|no)/

/(?(VERSION>10)yes|no)/

/(?(VERSION>=10.0.0)yes|no)/

/(?(VERSION=10.101)yes|no)/

/abcd/I

/abcd/I,no_start_optimize

/(|ab)*?d/I
   abd
   xyd

/(|ab)*?d/I,no_start_optimize
   abd
   xyd

/\k<A>*(?<A>aa)(?<A>bb)/match_unset_backref,dupnames
    aabb

/(((((a)))))/parens_nest_limit=2

/abc/replace=XYZ
    123123
    123abc123
    123abc123abc123
    123123\=zero_terminate
    123abc123\=zero_terminate
    123abc123abc123\=zero_terminate

/abc/g,replace=XYZ
    123abc123
    123abc123abc123

/abc/replace=X$$Z
    123abc123

/abc/g,replace=X$$Z
    123abc123abc123

/a(b)c(d)e/replace=X$1Y${2}Z
    "abcde"

/a(b)c(d)e/replace=X$1Y${2}Z,global
    "abcde-abcde"

/a(?<ONE>b)c(?<TWO>d)e/replace=X$ONE+${TWO}Z
    "abcde"

/a(?<ONE>b)c(?<TWO>d)e/g,replace=X$ONE+${TWO}Z
    "abcde-abcde-"

/abc/replace=a$++
    123abc

/abc/replace=a$bad
    123abc

/abc/replace=a${A234567890123456789_123456789012}z
    123abc

/abc/replace=a${A23456789012345678901234567890123}z
    123abc

/abc/replace=a${bcd
    123abc

/abc/replace=a${b+d}z
    123abc

/abc/replace=[10]XYZ
    123abc123

/abc/replace=[9]XYZ
    123abc123

/abc/replace=xyz
    1abc2\=partial_hard

/abc/replace=xyz
    123abc456
    123abc456\=replace=pqr
    123abc456abc789
    123abc456abc789\=g

/(?<=abc)(|def)/g,replace=<$0>
    123abcxyzabcdef789abcpqr

/./replace=$0
    a

/(.)(.)/replace=$2+$1
    abc

/(?<A>.)(?<B>.)/replace=$B+$A
    abc

/(.)(.)/g,replace=$2$1
    abcdefgh

/(*:pear)apple|(*:orange)lemon|(*:strawberry)blackberry/g,replace=${*MARK}
    apple lemon blackberry
    apple strudel
    fruitless

/(*:pear)apple|(*:orange)lemon|(*:strawberry)blackberry/replace=${*MARK} sauce,
    apple lemon blackberry

/(*:pear)apple|(*:orange)lemon|(*:strawberry)blackberry/g,replace=<$*MARK>
    apple lemon blackberry
    apple strudel
    fruitless

/(*:pear)apple/g,replace=${*MARKING}
    apple lemon blackberry

/(*:pear)apple/g,replace=${*MARK-time
    apple lemon blackberry

/(*:pear)apple/g,replace=${*mark}
    apple lemon blackberry

/(*:pear)apple|(*:orange)lemon|(*:strawberry)blackberry/g,replace=<$*MARKET>
    apple lemon blackberry

/(*:pear)apple|(*:orange)lemon|(*:strawberry)blackberry/g,replace=[22]${*MARK}
    apple lemon blackberry
    apple lemon blackberry\=substitute_overflow_length

/(*:pear)apple|(*:orange)lemon|(*:strawberry)blackberry/g,replace=[23]${*MARK}
    apple lemon blackberry

/abc/
    123abc123\=replace=[9]XYZ
    123abc123\=substitute_overflow_length,replace=[9]XYZ
    123abc123\=substitute_overflow_length,replace=[6]XYZ
    123abc123\=substitute_overflow_length,replace=[1]XYZ
    123abc123\=substitute_overflow_length,replace=[0]XYZ

/a(b)c/
    123abc123\=replace=[9]x$1z
    123abc123\=substitute_overflow_length,replace=[9]x$1z
    123abc123\=substitute_overflow_length,replace=[6]x$1z
    123abc123\=substitute_overflow_length,replace=[1]x$1z
    123abc123\=substitute_overflow_length,replace=[0]x$1z

"((?=(?(?=(?(?=(?(?=()))))))))"
    a

"(?(?=)==)(((((((((?=)))))))))"
\= Expect no match
    a

/(a)(b)|(c)/
    XcX\=ovector=2,get=1,get=2,get=3,get=4,getall

/x(?=ab\K)/
    xab\=get=0
    xab\=copy=0
    xab\=getall

/(?<A>a)|(?<A>b)/dupnames
    a\=ovector=1,copy=A,get=A,get=2
    a\=ovector=2,copy=A,get=A,get=2
    b\=ovector=2,copy=A,get=A,get=2

/a(b)c(d)/
    abc\=ph,copy=0,copy=1,getall

/^abc/info

/^abc/info,no_dotstar_anchor

/.*\d/info,auto_callout
\= Expect no match
    aaa

/.*\d/info,no_dotstar_anchor,auto_callout
\= Expect no match
    aaa

/.*\d/dotall,info

/.*\d/dotall,no_dotstar_anchor,info

/(*NO_DOTSTAR_ANCHOR)(?s).*\d/info

'^(?:(a)|b)(?(1)A|B)'
    aA123\=ovector=1
    aA123\=ovector=2

'^(?:(?<AA>a)|b)(?(<AA>)A|B)'
    aA123\=ovector=1
    aA123\=ovector=2

'^(?<AA>)(?:(?<AA>a)|b)(?(<AA>)A|B)'dupnames
    aA123\=ovector=1
    aA123\=ovector=2
    aA123\=ovector=3

'^(?:(?<AA>X)|)(?:(?<AA>a)|b)\k{AA}'dupnames
    aa123\=ovector=1
    aa123\=ovector=2
    aa123\=ovector=3

/(?<N111>(?J)(?<N111>1(111111)11|)1|1|)(?(<N111>)1)/

/(?<N>(?J)(?<N>))(?-J)\k<N>/

# Quantifiers are not allowed on condition assertions, but are otherwise
# OK in conditions.

/(?(?=0)?)+/

/(?(?=0)(?=00)?00765)/
     00765

/(?(?=0)(?=00)?00765|(?!3).56)/
     00765
     456
\= Expect no match
     356

'^(a)*+(\w)'
    g
    g\=ovector=1

'^(?:a)*+(\w)'
    g
    g\=ovector=1

# These two pattern showeds up compile-time bugs

"((?2){0,1999}())?"

/((?+1)(\1))/B

# Callouts with string arguments

/a(?C"/

/a(?C"a/

/a(?C"a"/

/a(?C"a"bcde(?C"b")xyz/

/a(?C"a)b""c")/B

/ab(?C" any text with spaces ")cde/B
    abcde
    12abcde

/^a(b)c(?C1)def/
      abcdef

/^a(b)c(?C"AB")def/
      abcdef

/^a(b)c(?C1)def/
      abcdef\=callout_capture

/^a(b)c(?C{AB})def/B
      abcdef\=callout_capture

/(?C`a``b`)(?C'a''b')(?C"a""b")(?C^a^^b^)(?C%a%%b%)(?C#a##b#)(?C$a$$b$)(?C{a}}b})/B,callout_info

/(?:a(?C`code`)){3}/B

/^(?(?C25)(?=abc)abcd|xyz)/B,callout_info
    abcdefg
    xyz123

/^(?(?C$abc$)(?=abc)abcd|xyz)/B
    abcdefg
    xyz123

/^ab(?C'first')cd(?C"second")ef/
    abcdefg

/(?:a(?C`code`)){3}X/
    aaaXY

# Binary zero in callout string
#  a  (  ?  C  '  x     z  '  )  b
/ 61 28 3f 43 27 78 00 7a 27 29 62/hex,callout_info
    abcdefgh

/(?(?!)^)/

/(?(?!)a|b)/
    bbb
\= Expect no match
    aaa

# JIT gives a different error message for the infinite recursion

"(*NO_JIT)((?2)+)((?1)){"
    abcd{

# Perl fails to diagnose the absence of an assertion

"(?(?<E>.*!.*)?)"

"X((?2)()*+){2}+"B

"X((?2)()*+){2}"B

/(?<=\bABQ(3(?-7)))/

/(?<=\bABQ(3(?+7)))/

";(?<=()((?3))((?2)))"

# Perl loops on this (PCRE2 used to!)

/(?<=\Ka)/g,aftertext
    aaaaa

/(?<=\Ka)/altglobal,aftertext
    aaaaa

/((?2){73}(?2))((?1))/info

/abc/
\= Expect no match
    \[9x!xxx(]{9999}

/(abc)*/
    \[abc]{5}

/^/gm
    \n\n\n

/^/gm,alt_circumflex
    \n\n\n

/((((((((x))))))))\81/
    xx1

/((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((x))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))\80/
    xx

/\80/

/A\8B\9C/
    A8B9C

/(?x:((?'a')) # comment (with parentheses) and | vertical
(?-x:#not a comment (?'b')) # this is a comment ()
(?'c')) # not a comment (?'d')/info

/(?|(?'a')(2)(?'b')|(?'a')(?'a')(3))/I,dupnames
    A23B
    B32A

# These are some patterns that used to cause buffer overflows or other errors
# while compiling.

/.((?2)(?R)|\1|$)()/B

/.((?3)(?R)()(?2)|\1|$)()/B

/(\9*+(?2);\3++()2|)++{/

/\V\x85\9*+((?2)\3++()2)*:2/

/(((?(R)){0,2}) (?'x'((?'R')((?'R')))))/dupnames

/(((?(X)){0,2}) (?'x'((?'X')((?'X')))))/dupnames

/(((?(R)){0,2}) (?'x'((?'X')((?'R')))))/

"(?J)(?'d'(?'d'\g{d}))"

"(?=!((?2)(?))({8(?<=(?1){29}8bbbb\x16\xd\xc6^($(\xa9H4){4}h}?1)B))\x15')"

/A(?'')Z/

"(?J:(?|(?'R')(\k'R')|((?'R'))))"

/(?<=|(\,\$(?73591620449005828816)\xa8.{7}){6}\x09)/

/^(?:(?(1)x|)+)+$()/B

/[[:>:]](?<)/

/((?x)(*:0))#(?'/

/(?C$[$)(?<]/

/(?C$)$)(?<]/

/(?(R))*+/B
    abcd

/((?x)(?#))#(?'/

/((?x)(?#))#(?'abc')/I

/[[:\\](?<[::]/

/[[:\\](?'abc')[a:]/I

"[[[.\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[[[:[::::::[[[:[[[[[[[[:[[::[::::[[:::::::[[:[[[[[[[:[[::[:[[:[~"

/()(?(R)0)*+/B

/(?R-:(?</

/(?R-:(?<)/

/(?(?C{\Q})(?!(?'/

/(?(?C{\Q})(?!(?'abc')))/I

/(?1){3918}(((((0(\k'R'))))(?J)(?'R'(?'R'\3){99})))/I

/(?|(aaa)|(b))\g{1}/I

/(?|(aaa)|(b))(?1)/I

/(?|(aaa)|(b))/I

/(?|(?'a'aaa)|(?'a'b))\k'a'/I

/(?|(?'a'aaa)|(?'a'b))(?'a'cccc)\k'a'/I,dupnames

/ab{3cd/
    ab{3cd

/ab{3,cd/
    ab{3,cd

/ab{3,4a}cd/
    ab{3,4a}cd

/{4,5a}bc/
    {4,5a}bc

/\x0{ab}/
    \0{ab}

/^(a(b))\1\g1\g{1}\g-1\g{-1}\g{-02}Z/
    ababababbbabZXXXX

/.*?a(*PRUNE)b/
    aab

/.*?a(*PRUNE)b/s
    aab

/^a(*PRUNE)b/s
\= Expect no match
    aab

/.*?a(*SKIP)b/
    aab

/(?(8000000000/

/((?(R8000000000)))/

/0(?0)|(1)(*THEN)(*SKIP:0)(*FAIL)/
\= Expect no match
    01

/(?(1)()\983040\2)/

/(*LIMIT_MATCH=)abc/

/(*CRLF)(*LIMIT_MATCH=)abc/

/(?:ab)?(?:ab)(?:ab)/
    abab
    ababab
\= Expect no match
    aba

/((*MARK:A))++a(*SKIP:B)b/
\= Expect no match
    aacb

/(*MARK:a\zb)z/alt_verbnames

/(*:ab\t(d\)c)xxx/

/(*:ab\t(d\)c)xxx/alt_verbnames,mark
    cxxxz

/(*:A\Qxx)x\EB)x/alt_verbnames,mark
    x

/(*:A\ExxxB)x/alt_verbnames,mark
    x

/(*: A \ and #comment
     \ B)x/x,alt_verbnames,mark
    x

/(*: A \ and #comment
     \ B)x/alt_verbnames,mark
    x

/(*: A \ and #comment
     \ B)x/x,mark
    x

/(*: A \ and #comment
     \ B)x/mark
    x

/(*:A
B)x/alt_verbnames,mark
    x

/(*:abc\Qpqr)/alt_verbnames

/abc/use_offset_limit
    1234abcde\=offset_limit=100
    1234abcde\=offset_limit=9
    1234abcde\=offset_limit=4
    1234abcde\=offset_limit=4,offset=4
\= Expect no match
    1234abcde\=offset_limit=4,offset=5
    1234abcde\=offset_limit=3

/(?<=abc)/use_offset_limit
    1234abc\=offset_limit=7
\= Expect no match
    1234abc\=offset_limit=6

/A/g,replace=-,use_offset_limit
    XAXAXAXAXA\=offset_limit=4

/abc/
\= Expect error
    1234abcde\=offset_limit=4

/^\w/m,use_offset_limit
    \n..\naa\=offset_limit=3
    \n..\naa\=offset_limit=4

/abcd/null_context
    abcd\=null_context
\= Expect error
    abcd\=null_context,find_limits
    abcd\=allusedtext,startchar

/abcd/replace=w\rx\x82y\o{333}z(\Q12\$34$$\x34\E5$$),substitute_extended
    abcd

/a(bc)(DE)/replace=a\u$1\U$1\E$1\l$2\L$2\Eab\Uab\LYZ\EDone,substitute_extended
    abcDE

/abcd/replace=xy\kz,substitute_extended
    abcd

/a(?:(b)|(c))/substitute_extended,replace=X${1:+1:-1}X${2:+2:-2}
    ab
    ac
    ab\=replace=${1:+$1\:$1:$2}
    ac\=replace=${1:+$1\:$1:$2}

/a(?:(b)|(c))/substitute_extended,replace=X${1:-1:-1}X${2:-2:-2}
    ab
    ac

/(a)/substitute_extended,replace=>${1:+\Q$1:{}$$\E+\U$1}<
    a

/X(b)Y/substitute_extended
    XbY\=replace=x${1:+$1\U$1}y
    XbY\=replace=\Ux${1:+$1$1}y

/a/substitute_extended,replace=${*MARK:+a:b}
    a

/(abcd)/replace=${1:+xy\kz},substitute_extended
    abcd

/(abcd)/
    abcd\=replace=${1:+xy\kz},substitute_extended

/abcd/substitute_extended,replace=>$1<
    abcd

/abcd/substitute_extended,replace=>xxx${xyz}<<<
    abcd

/(?J)(?:(?<A>a)|(?<A>b))/replace=<$A>
    [a]
    [b]
\= Expect error
    (a)\=ovector=1

/(a)|(b)/replace=<$1>
\= Expect error
    b

/(aa)(BB)/substitute_extended,replace=\U$1\L$2\E$1..\U$1\l$2$1
    aaBB

/^(o(\1{72}{\"{\\{00000059079}\d*){74}}){19}/I

/((p(?'K/

/((p(?'K/no_auto_capture

/abc/replace=A$3123456789Z
    abc

/(?<!a{65535}a{5})x/I

/(?<!a{65535})x/I

/(?=a\K)/replace=z
    BaCaD
    
/(?<=\K.)/g,replace=-
    ab

/(?'abcdefghijklmnopqrstuvwxyzABCDEFG'toolong)/

/(?'abcdefghijklmnopqrstuvwxyzABCDEF'justright)/

# These two use zero-termination
/abcd/max_pattern_length=3

/abc/max_pattern_length=3

# These two, being hex, pass the length
/abcdefab/hex,max_pattern_length=3

/abcdef/hex,max_pattern_length=3

# These patterns used to take a long time to compile

"(.*)
((?-2)(?-2))((?-2)(?-2))((?-2)(?-2))((?-2)(?-2))
((?-2)(?-2))((?-2)(?-2))((?-2)(?-2))((?-2)(?-2))
((?-2)(?-2))((?-2)(?-2))((?-2)(?-2))"xI

"(?<=a()
((?-2)(?-2))((?-2)(?-2))((?-2)(?-2))((?-2)(?-2))
((?-2)(?-2))((?-2)(?-2))((?-2)(?-2))((?-2)(?-2))
((?-2)(?-2))((?-2)(?-2))((?-2)(?-2))
a)"xI

"(?|()|())(.*)
((?-2)(?-2))((?-2)(?-2))((?-2)(?-2))((?-2)(?-2))
((?-2)(?-2))((?-2)(?-2))((?-2)(?-2))((?-2)(?-2))
((?-2)(?-2))((?-2)(?-2))((?-2)(?-2))"xI

"(?|()|())(?<=a()
((?-2)(?-2))((?-2)(?-2))((?-2)(?-2))((?-2)(?-2))
((?-2)(?-2))((?-2)(?-2))((?-2)(?-2))((?-2)(?-2))
((?-2)(?-2))((?-2)(?-2))((?-2)(?-2))
a)"xI

# Test the use of malloc for caching group information when there are more
# groups than fit into the on-stack workspace.

/\[()]{1024}/I,expand

# Test minlength capped at 65535

/(A{65000})\1{65000}/I

# Test group scans when numbers are not unique

/(?|()+|(a)+)/BI

/(?|(a)+|()+)/BI

/(?|()|(a))/BI

/(?|(a)|())/BI

# Test CRLF handling in empty string substitutions

/^$/gm,newline=anycrlf,replace=-
    X\r\n\r\nY

/^$/gm,newline=crlf,replace=-
    X\r\n\r\nY

/^$/gm,newline=any,replace=-
    X\r\n\r\nY

"(*ANYCRLF)(?m)^(.*[^0-9\r\n].*|)$"g,replace=NaN
    15\r\nfoo\r\n20\r\nbar\r\nbaz\r\n\r\n20

/a[[:punct:]b]/bincode

/a[b[:punct:]]/bincode

/L(?#(|++<!(2)?/B

/L(?#(|++<!(2)?/B,no_auto_possess

/L(?#(|++<!(2)?/B,auto_callout

/L(?#(|++<!(2)?/B,no_auto_possess,auto_callout

/(A*)\E+/B,auto_callout

/()\Q\E*]/B,auto_callout
    a[bc]d

/\x8a+f|;T?(*:;.'?`(\xeap ){![^()!y*''C*(?';]{1;(\x08)/B,alt_verbnames,dupnames,extended

# Tests for NULL characters in comments and verb "names" and callouts

# /A#B\x00C\x0aZ/
/41 23 42 00 43 0a 5a/Bx,hex

# /A+#B\x00C\x0a+/
/41 2b 23 42 00 43 0a 2b/Bx,hex

# /A(*:B\x00W#X\00Y\x0aC)Z/
/41 28 2a 3a 42 00 57 23 58 00 59 0a 43 29 5a/Bx,hex,alt_verbnames

# /A(*:B\x00W#X\00Y\x0aC)Z/
/41 28 2a 3a 42 00 57 23 58 00 59 0a 43 29 5a/Bx,hex

# /A(?C{X\x00Y})B/
/41 28 3f 43 7b 58 00 59 7d 29 42/B,hex

# /A(?#X\x00Y)B/
/41 28 3f 23 7b 00 7d 29 42/B,hex

# Tests for leading comment in extended patterns

/ (?-x):?/extended

/(?-x):?/extended

/0b 28 3f 2d 78 29 3a/hex,extended

/#comment
(?-x):?/extended

/(8(*:6^\x09x\xa6l\)6!|\xd0:[^:|)\x09d\Z\d{85*m(?'(?<1!)*\W[*\xff]!!h\w]*\xbe;/alt_bsux,alt_verbnames,allow_empty_class,dollar_endonly,extended,multiline,never_utf,no_dotstar_anchor,no_start_optimize

/a|(b)c/replace=>$1<,substitute_unset_empty
    cat
    xbcom

/a|(b)c/
    cat\=replace=>$1<
    cat\=replace=>$1<,substitute_unset_empty
    xbcom\=replace=>$1<,substitute_unset_empty

/a|(b)c/substitute_extended
    cat\=replace=>${2:-xx}<
    cat\=replace=>${2:-xx}<,substitute_unknown_unset
    cat\=replace=>${X:-xx}<,substitute_unknown_unset

/a|(?'X'b)c/replace=>$X<,substitute_unset_empty
    cat
    xbcom

/a|(?'X'b)c/replace=>$Y<,substitute_unset_empty
    cat
    cat\=substitute_unknown_unset
    cat\=substitute_unknown_unset,-substitute_unset_empty

/a|(b)c/replace=>$2<,substitute_unset_empty
    cat
    cat\=substitute_unknown_unset
    cat\=substitute_unknown_unset,-substitute_unset_empty

/()()()/use_offset_limit
    \=ovector=11000000000
    \=callout_fail=11000000000
    \=callout_fail=1:11000000000
    \=callout_data=11000000000
    \=callout_data=-11000000000
    \=offset_limit=1100000000000000000000
    \=copy=11000000000

/(*MARK:A\x00b)/mark
    abc

/(*MARK:A\x00b)/mark,alt_verbnames
    abc

/"(*MARK:A" 00 "b)"/mark,hex
    abc

/"(*MARK:A" 00 "b)"/mark,hex,alt_verbnames
    abc

/efg/hex

/eff/hex

/effg/hex

/(?J)(?'a'))(?'a')/

/(?<=((?C)0))/
    9010
\= Expect no match
    abc

/aaa/
\[abc]{10000000000000000000000000000}
\[a]{3}

/\[AB]{6000000000000000000000}/expand

# Hex uses pattern length, not zero-terminated. This tests for overrunning
# the given length of a pattern.

/'(*U'/hex

/'(*'/hex

/'('/hex

//hex

# These tests are here because Perl never allows a back reference in a
# lookbehind. PCRE2 supports some limited cases.

/([ab])...(?<=\1)z/
    a11az
    b11bz
\= Expect no match
    b11az

/(?|([ab]))...(?<=\1)z/

/([ab])(\1)...(?<=\2)z/
    aa11az

/(a\2)(b\1)(?<=\2)/

/(?<A>[ab])...(?<=\k'A')z/
    a11az
    b11bz
\= Expect no match
    b11az

/(?<A>[ab])...(?<=\k'A')(?<A>)z/dupnames

# Perl does not support \g+n

/((\g+1X)?([ab]))+/
    aaXbbXa

/ab(?C1)c/auto_callout
    abc

/'ab(?C1)c'/hex,auto_callout
    abc

# Perl accepts these, but gives a warning. We can't warn, so give an error.

/[a-[:digit:]]+/
    a-a9-a

/[A-[:digit:]]+/
    A-A9-A

/[a-\d]+/
    a-a9-a

/(?<RA>abc)(?(R)xyz)/B

/(?<R>abc)(?(R)xyz)/B

/(?=.*[A-Z])/I

/()(?<=(?0))/

/(?<!|!(?<!))/

/(?<!|!|!||||||(?<!)||(?<!)!|!||(?<!)!|!(?<!)!|!|!|!||||!!|<!)!|!||||!|/

/{2,2{2,2/use_length

/.>*?\g'0/use_length

/.>*?\g'0/

/{„Í„ÍÍ„Í{'{22{2{{2{'{22{{22{2{'{22{2{{2{{222{{2{'{22{2{22{2{'{22{2{{2{'{22{2{22{2{'{'{22{2{22{2{'{22{2{{2{'{22{2{22{2{'{222{2Ä„Í„ÍÍ„Í{'{22{2{{2{'{22{{11{2{'{22{2{{2{{'{22{2{{2{'{22{{22{1{'{22{2{{2{{222{{2{'{22{2{22{2{'{/auto_callout

//
\=get=i00000000000000000000000000000000
\=get=i2345678901234567890123456789012,get=i1245678901234567890123456789012

"(?(?C))"

/(?(?(?(?(?(?))))))/

/(?<=(?1))((?s))/anchored

/(*:ab)*/

%(*:(:(svvvvvvvvvv:]*[   Z!*;[]*[^[]*!^[+.+{{2,7}'      _\\\\\\\\\\\\\)?.:..    *w////\\\Q\\\\\\\\\\\\\\\T\\\\\+/?/////'+\\\EEE?/////'+/*+/[^K]?]//(w)%never_backslash_c,alt_verbnames,auto_callout

/./newline=crlf
    \=ph

/(\x0e00\000000\xc)/replace=\P,substitute_extended
    \x0e00\000000\xc

//replace=0
    \=offset=7

".+\QX\E+"B,no_auto_possess

".+\QX\E+"B,auto_callout,no_auto_possess

# This one is here because Perl gives an 'unmatched )' error which goes away
# if one of the \) sequences is removed - which is weird. PCRE finds it too
# complicated to find a minimum matching length.

"()X|((((((((()))))))((((())))))\2())((((((\2\2)))\2)(\22((((\2\2)2))\2)))(2\ZZZ)+:)Z^|91ZiZZnter(ZZ |91Z(ZZ ZZ(\r2Z( or#(\Z2(Z\Z(\2\2)2))\2Z)Z(\22Z((\Z2(Z\Z(\2\2)2))\2Z+:)Z|91Z(ZZ ZZ(\r2Z( or#(\Z2(Z\Z((Z*(\2(Z\':))\0)i|||||||||||||||loZ\2\2)2))\2Z)Z(\22Z((\Z2(Z\Z(\2\2)2))\2Z)))int \)\0nte!rnal errpr\2\\21r(2\ZZZ)+:)Z!|91Z(ZZ ZZ(\r2Z( or#(\Z2(Z\Z(\2\2)2))\2Z)Z(\22Z((\Z2(Z\Z(\2\2)2))\2Z)))int \)\0(2\ZZZ)+:)Z^|91ZiZZnter(ZZ |91Z(ZZ ZZ(\r2Z( or#(\Z2(Z\Z(\2\2)2))\2Z)Z(\22Z((\Z2(Z\Z(\2\2)2))\2Z)))int \)\0(2\ZZZ)+:)Z^)))int \)\0(2\ZZZ)+:)Z^|91ZiZZnter(ZZernZal ZZ(\r2Z( or#(\Z2(Z\Z(\2\2)2))\2Z)Z(\22Z((\Z2(Z\Z(\2\2)2))\2Z)))int \))\ZZ(\r2Z( or#(\Z2(Z\Z(\2\2)2))\2Z)Z(\22Z((\Z2(Z\Z(\2\2)))\2))))((((((\2\2))))))"I

# This checks that new code for handling groups that may match an empty string
# works on a very large number of alternatives. This pattern used to provoke a
# complaint that it was too complicated.

/(?:\[A|B|C|D|E|F|G|H|I|J|]{200}Z)/expand

# This one used to compile rubbish instead of a compile error, and then
# behave unpredictably at match time.

/.+(?(?C'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX'))?!XXXX.=X/
    .+(?(?C'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX'))?!XXXX.=X

/[:[:alnum:]-[[a:lnum:]+/

/((?(?C'')\QX\E(?!((?(?C'')(?!X=X));=)r*X=X));=)/

/((?(?C'')\Q\E(?!((?(?C'')(?!X=X));=)r*X=X));=)/

/abcd/auto_callout
    abcd\=callout_error=255:2

/()(\g+65534)/

/()(\g+65533)/

/Á\x00\x00\x00š(\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\2*\x00k\d+\x00‎\x00\x00\x00\x00\x00\2*\x00\x00\1*.){36}int^\x00\x00ÿÿ\x00š(\1{50779}?)J\w2/I

/(a)(b)\2\1\1\1\1/I

/(?<a>a)(?<b>b)\g{b}\g{a}\g{a}\g{a}\g{a}(?<a>xx)(?<b>zz)/I,dupnames

//
    \=ovector=7777777777

# This is here because Perl matches, even though a COMMIT is encountered
# outside of the recursion.

/(?1)(A(*COMMIT)|B)D/
    BAXBAD

"(?1){2}(a)"B

"(?1){2,4}(a)"B

# This test differs from Perl for the first subject. Perl ends up with
# $1 set to 'B'; PCRE2 has it unset (which I think is right).

/^(?:
(?:A| (?:B|B(*ACCEPT)) (?<=(.)) D)
(Z)
)+$/x
    AZB
    AZBDZ

# The first of these, when run by Perl, gives the mark 'aa', which is wrong.

'(?>a(*:aa))b|ac' mark
    ac

'(?:a(*:aa))b|ac' mark
    ac

/(R?){65}/
    (R?){65}

/\[(a)]{60}/expand
    aaaa

/(?<!\1((?U)1((?U))))(*F)/never_backslash_c,alt_bsux,anchored,extended

/\g{3/

/(a(?C1)(b)(c)d)+/
  abcdabcd\=callout_capture

# Perl matches this one, but PCRE does not because (*ACCEPT) clears out any
# pending backtracks in the recursion.

/^ (?(DEFINE) (..(*ACCEPT)|...) ) (?1)$/x
\= Expect no match
    abc

# Perl gives no match for this one

/(a(*MARK:m)(*ACCEPT)){0}(?1)/mark
    abc

/abc/endanchored
    xyzabc
\= Expect no match
    xyzabcdef
\= Expect error
    xyzabc\=ph

/abc/
    xyzabc\=endanchored
\= Expect no match
    xyzabcdef\=endanchored
\= Expect error
    xyzabc\=ps,endanchored

/abc(*ACCEPT)d/endanchored
    xyzabc
\= Expect no match
    xyzabcdef

/abc|bcd/endanchored
    xyzabcd
\= Expect no match
    xyzabcdef

/a(*ACCEPT)x|aa/endanchored
    aaa

# Check auto-anchoring when there is a group that is never obeyed at
# the start of a branch.

/(?(DEFINE)(a))^bc/I

/(a){0}.*bc/sI

# This should be anchored, as the condition is always false and there is
# no alternative branch.

/(?(VERSION>=999)yes)^bc/I

# This should not be anchored.

/(?(VERSION>=999)yes|no)^bc/I

/(*LIMIT_HEAP=0)xxx/I

/\d{0,3}(*:abc)(?C1)xxx/callout_info

# ----------------------------------------------------------------------

# These are a whole pile of tests that touch lines of code that are not
# used by any other tests (at least when these were created).

/^a+?x/i,no_start_optimize,no_auto_possess
\= Expect no match
    aaa

/^[^a]{3,}?x/i,no_start_optimize,no_auto_possess
\= Expect no match
    bbb
    cc

/^X\S/no_start_optimize,no_auto_possess
\= Expect no match
    X

/^X\W/no_start_optimize,no_auto_possess
\= Expect no match
    X

/^X\H/no_start_optimize,no_auto_possess
\= Expect no match
    X

/^X\h/no_start_optimize,no_auto_possess
\= Expect no match
    X

/^X\V/no_start_optimize,no_auto_possess
\= Expect no match
    X

/^X\v/no_start_optimize,no_auto_possess
\= Expect no match
    X

/^X\h/no_start_optimize,no_auto_possess
\= Expect no match
    XY

/^X\V/no_start_optimize,no_auto_possess
\= Expect no match
    X\n

/^X\v/no_start_optimize,no_auto_possess
\= Expect no match
    XX

/^X.+?/s,no_start_optimize,no_auto_possess
\= Expect no match
    X

/^X\R+?/no_start_optimize,no_auto_possess
\= Expect no match
    XX

/^X\H+?/no_start_optimize,no_auto_possess
\= Expect no match
    X

/^X\h+?/no_start_optimize,no_auto_possess
\= Expect no match
    X

/^X\V+?/no_start_optimize,no_auto_possess
\= Expect no match
    X
    X\n

/^X\D+?/no_start_optimize,no_auto_possess
\= Expect no match
    X
    X9

/^X\S+?/no_start_optimize,no_auto_possess
\= Expect no match
    X
    X\n

/^X\W+?/no_start_optimize,no_auto_possess
\= Expect no match
    X
    XX

/^X.+?Z/no_start_optimize,no_auto_possess
\= Expect no match
    XY\n

/(*CRLF)^X.+?Z/no_start_optimize,no_auto_possess
\= Expect no match
    XY\r\=ps

/^X\R+?Z/no_start_optimize,no_auto_possess
\= Expect no match
    X\nX
    X\n\r\n
    X\n\rY
    X\n\nY
    X\n\x{0c}Y

/(*BSR_ANYCRLF)^X\R+?Z/no_start_optimize,no_auto_possess
\= Expect no match
    X\nX
    X\n\r\n
    X\n\rY
    X\n\nY
    X\n\x{0c}Y

/^X\H+?Z/no_start_optimize,no_auto_possess
\= Expect no match
    XY\t
    XYY

/^X\h+?Z/no_start_optimize,no_auto_possess
\= Expect no match
    X\t\t
    X\tY

/^X\V+?Z/no_start_optimize,no_auto_possess
\= Expect no match
    XY\n
    XYY

/^X\v+?Z/no_start_optimize,no_auto_possess
\= Expect no match
    X\n\n
    X\nY

/^X\D+?Z/no_start_optimize,no_auto_possess
\= Expect no match
    XY9
    XYY

/^X\d+?Z/no_start_optimize,no_auto_possess
\= Expect no match
    X99
    X9Y

/^X\S+?Z/no_start_optimize,no_auto_possess
\= Expect no match
    XY\n
    XYY

/^X\s+?Z/no_start_optimize,no_auto_possess
\= Expect no match
    X\n\n
    X\nY

/^X\W+?Z/no_start_optimize,no_auto_possess
\= Expect no match
    X.A
    X++

/^X\w+?Z/no_start_optimize,no_auto_possess
\= Expect no match
    Xa.
    Xaa

/^X.{1,3}Z/s,no_start_optimize,no_auto_possess
\= Expect no match
    Xa.bd

/^X\h+Z/no_start_optimize,no_auto_possess
\= Expect no match
    X\t\t
    X\tY

/^X\V+Z/no_start_optimize,no_auto_possess
\= Expect no match
    XY\n
    XYY

/^(X(*THEN)Y|AB){0}(?1)/
    ABX
\= Expect no match
    XAB

/^(?!A(?C1)B)C/
    ABC\=callout_error=1,no_jit

/^(?!A(?C1)B)C/no_start_optimize
    ABC\=callout_error=1

/^(?(?!A(?C1)B)C)/
    ABC\=callout_error=1

# ----------------------------------------------------------------------

/[a b c]/BxxI

/[a b c]/BxxxI

/[a b c]/B,extended_more

/[ a b c ]/B,extended_more

/[a b](?xx: [ 12 ] (?-xx:[ 34 ]) )y z/B

# Unsetting /x also unsets /xx

/[a b](?xx: [ 12 ] (?-x:[ 34 ]) )y z/B

/(a)(?-n:(b))(c)/nB

# ----------------------------------------------------------------------
# These test the dangerous PCRE2_EXTRA_BAD_ESCAPE_IS_LITERAL option.

/\j\x{z}\o{82}\L\uabcd\u\U\g{\g/B,\bad_escape_is_literal

/\N{\c/IB,bad_escape_is_literal

/[\j\x{z}\o\gA-\Nb-\g]/B,bad_escape_is_literal

/[Q-\N]/B,bad_escape_is_literal

# ----------------------------------------------------------------------

/a\b(c/literal
    a\\b(c

/a\b(c/literal,caseless
    a\\b(c
    a\\B(c

/a\b(c/literal,firstline
    XYYa\\b(c
\= Expect no match
    X\na\\b(c

/a\b?c/literal,use_offset_limit
    XXXXa\\b?c\=offset_limit=4
\= Expect no match
    XXXXa\\b?c\=offset_limit=3

/a\b(c/literal,anchored,endanchored
    a\\b(c
\= Expect no match
    Xa\\b(c
    a\\b(cX
    Xa\\b(cX

//literal,extended

/a\b(c/literal,auto_callout,no_start_optimize
    XXXXa\\b(c

/a\b(c/literal,auto_callout
    XXXXa\\b(c

/(*CR)abc/literal
    (*CR)abc

/cat|dog/I,match_word
    the cat sat
\= Expect no match
    caterpillar
    snowcat
    syndicate

/(cat)|dog/I,match_line,literal
    (cat)|dog
\= Expect no match
    the cat sat
    caterpillar
    snowcat
    syndicate

/a whole line/match_line,multiline
    Rhubarb \na whole line\n custard
\= Expect no match
    Not a whole line

# Perl gets this wrong, failing to capture 'b' in group 1.

/^(b+|a){1,2}?bc/
    bbc
    
# And again here, for the "babc" subject string. 

/^(b*|ba){1,2}?bc/
    babc
    bbabc
    bababc
\= Expect no match
    bababbc
    babababc

/[[:digit:]-a]/

/[[:digit:]-[:print:]]/

/[\d-a]/

/[\H-z]/

/[\d-[:print:]]/

# Perl gets the second of these wrong, giving no match.

"(?<=(a))\1?b"I
    ab
    aaab 

"(?=(a))\1?b"I
    ab
    aaab
    
# JIT does not support callout_extra  
    
/(*NO_JIT)(a+)b/auto_callout,no_start_optimize,no_auto_possess
\= Expect no match
    aac\=callout_extra 
    
/(*NO_JIT)a+(?C'XXX')b/no_start_optimize,no_auto_possess
\= Expect no match
    aac\=callout_extra 

/\n/firstline
    xyz\nabc

/\nabc/firstline
    xyz\nabc

/\x{0a}abc/firstline,newline=crlf
\= Expect no match
    xyz\r\nabc

/[abc]/firstline
\= Expect no match
    \na
    
# These tests are matched in test 1 as they are Perl compatible. Here we are
# looking at what does and does not get auto-possessified. 

/(?(DEFINE)(?<optional_a>a?))^(?&optional_a)a$/B

/(?(DEFINE)(?<optional_a>a?)X)^(?&optional_a)a$/B
    
/^(a?)b(?1)a/B

/^(a?)+b(?1)a/B

/^(a?)++b(?1)a/B

/^(a?)+b/B

/(?=a+)a(a+)++b/B

# End of testinput2