# 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

/(a)b|/I

/abc/I
    abc
    defabc
    abc\=anchored
    *** Failers
    defabc\=anchored
    ABC

/^abc/I
    abc
    abc\=anchored
    *** Failers
    defabc
    defabc\=anchored

/a+bc/I

/a*bc/I

/a{3}bc/I

/(abc|a+z)/I

/^abc$/I
    abc
    *** Failers
    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
    *** Failers
    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
    *** Failers
    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
    *** Failers
    the barfoo
    and cattlefoo

/(?<=a+)b/

/(?<=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
    *** Failers
    a\=noteol
    a\n\=noteol

/a$/Im
    a
    a\n
    a\n\=noteol
    *** Failers
    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
    ***Failers
    rhubarb
    barbell
    abc\nbarton

/^(?<=foo\n)bar/Im
    foo\nbarbar
    ***Failers
    rhubarb
    barbell
    abc\nbarton

/(?>^abc)/Im
    abc
    def\nabc
    *** Failers
    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
    *** Failers
    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
    *** Failers
    ZZ
    abXYZZ
    zzz
    bzz

/(?<!(foo)a)bar/I
    bar
    foobbar
    *** Failers
    fooabar

/This one is here because Perl behaves differently; see also the following/I

/^(a\1?){4}$/I
    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
    ** Failers
    xa=xaaa

/^(xa|=?\1a)+$/
    xa=xaa
    ** Failers
    xa=xaaa

/These are syntax tests from Perl 5.005/I

/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
    *** Failers
    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

/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
    \
    *** Failers
    \=notempty

/|-/I
    abcd
    -abc
    ab-c\=notempty
    *** Failers
    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
    *** Failers
    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))
    *** Failers
    ()

/\(  (?: (?>[^()]+) | (?R) )? \) /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
    *** Failers
    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
    *** Failers
    AB

/(a(?i)b)/IB
    ab
    aB
    *** Failers
    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
    *** Failers
    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
    *** Failers
    this is not a line with only words and spaces!

/(\d++)(\w)/I
    12345a
    *** Failers
    12345+

/a++b/I
    aaab

/(a++b)/I
    aaab

/(a++)b/I
    aaab

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

/\(([^()]++|\([^()]+\))+\)/I
    (abc)
    (abc(def)xyz)
    *** Failers
    ((()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<>
    *** Failers
    <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

/(?(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
  *** Failers
  xyabc

/c|abc/I

/(?i)[ab]/I

/[ab](?i)cd/I

/abc(?C)def/I
    abcdef
    1234abcdef
    *** Failers
    abcxyz
    abcxyzf

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

/(?C1)\dabc(?C2)def/I
    1234abcdef
    *** Failers
    abcdef

/(?C1)\dabc(?C2)def/I
    1234abcdef
    *** Failers
    abcdef

/(?C255)ab/I

/(?C256)ab/I

/(?Cab)xx/I

/(?C12vr)x/I

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

/(abc)(?C)de(?C1)f/I
    123abcdef
    123abcdef\=callout_capture
    123abcdefC-\=callout_none
    *** Failers
    123abcdef\=callout_fail=1

/(?C0)(abc(?C1))*/I
    abcabcabc
    abcabc\=callout_fail=1:3
    *** Failers
    abcabcabc\=callout_fail=1:3

/(\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
    abbbbbccc\=callout_data=1

/a(b+?)(c*?)(?C1)/I
    abbbbbccc\=callout_data=1

/(?C)abc/I

/(?C)^abc/I

/(?C)a|b/I

/(?R)/I

/(a|(?R))/I

/(ab|(bc|(de|(?R))))/I

/x(ab|(bc|(de|(?R))))/I
    xab
    xbc
    xde
    xxab
    xxxab
    *** Failers
    xyab

/(ab|(bc|(de|(?1))))/I

/x(ab|(bc|(de|(?1)x)x)x)/I

/^([^()]|\((?1)*\))*$/I
    abc
    a(b)c
    a(b(c))d
    *** Failers)
    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
    *** Failers
    ((2+2)*-3)-7)

/^(x(y|(?1){2})z)/I
    xyz
    xxyzxyzz
    *** Failers
    xxyzz
    xxyzxyzxyzz

/((< (?: (?(R) \d++  | [^<>]*+) | (?2)) * >))/Ix
    <>
    <abcd>
    <abc <123> hij>
    <abc <def> hij>
    <abc<>def>
    <abc<>
    *** Failers
    <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.
    *** Failers
    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

/(a+)*zz/I
  aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaazzbbbbbb\=find_limits
  aaaaaaaaaaaaaz\=find_limits

/(aaa(?C1)bbb|ab)/I
   aaabbb
   aaabbb\=callout_data=0
   aaabbb\=callout_data=1
   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]
    *** Failers
    []

"\[((?P<elem>\d+)(,(?P>elem))*)?\]"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}+/IB

/((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
  abcdfe

/a*b/IB,auto_callout
  ab
  aaaab
  aaaacb

/a*b/IB,auto_callout
  ab
  aaaab
  aaaacb

/a+b/IB,auto_callout
  ab
  aaaab
  aaaacb

/(abc|def)x/IB,auto_callout
  abcx
  defx
  ** Failers 
  abcdefzx

/(abc|def)x/IB,auto_callout
  abcx
  defx
  ** Failers 
  abcdefzx

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

/([ab]{,4}c|xy)/IB,auto_callout
    Note: that { does NOT introduce a quantifier

/([ab]{,4}c|xy)/IB,auto_callout
    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\=offset=1

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

/abcde/I
    ab\=ps
    abc\=ps
    abcd\=ps
    abcde\=ps
    the quick brown abc\=ps
    ** Failers\=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
    ** Failers\=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
    *** Failers
    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

/^a/I,flipbytes

/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
    ** Failers
    line one\nthis is a line\nbreak in the second line

/line\nbreak/Im,firstline
    this is a line\nbreak
    ** Failers
    line one\nthis is a line\nbreak in the second line

/(?i)(?-i)AbCd/I
    AbCd
    ** Failers
    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
    ** Failers
    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
    ** Failers
    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 pcre_get_named_substring() produces
a random value. /Ix

/^(?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
    ** Failers
    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
    xyz\nabc
    xyz\nabc>\=newline=lf
    xyz\r\nabc>\=newline=lf
    xyz\rabc>\=newline=cr
    xyz\r\nabclf>\=newline=crlf
    ** Failers
    xyz\nabc>\=newline=cr
    xyz\r\nabc>\=newline=cr
    xyz\nabclf>\=newline=crlf
    xyz\rabclf>\=newline=crlf
    xyz\rabc>\=newline=lf

/abc$/Im,newline=lf
    xyzabc
    xyzabc\n
    xyzabc\npqr
    xyzabc\r>\=newline=cr
    xyzabc\rpqr>\=newline=cr
    xyzabc\r\nlf>\=newline=crlf
    xyzabc\r\npqrlf>\=newline=crlf
    ** Failers
    xyzabc\r
    xyzabc\rpqr
    xyzabc\r\n
    xyzabc\r\npqr

/^abc/Im,newline=cr
    xyz\rabcdef
    xyz\nabcdef>\=newline=lf
    ** Failers
    xyz\nabcdef

/^abc/Im,newline=lf
    xyz\nabcdef
    xyz\rabcdef>\=newline=cr
    ** Failers
    xyz\rabcdef

/^abc/Im,newline=crlf
    xyz\r\nabcdef
    xyz\rabcdef>\=newline=cr
    ** Failers
    xyz\rabcdef

/^abc/Im,newline=bad

/abc/I
    xyz\rabc\=newline=bad
    abc

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

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

!((?:\s|//.*\\n|/[*](?:\\n|.)*?[*]/)*)!I
   /* this is a C style comment */\=find_limits

/(?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
    ** Failers
    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
    ** Failers
    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
    ** Failers
    axby

/^(((?P=abc)|X)(?<abc>x|y))+/
    XxXxxx
    XxXyyx
    XxXyxx
    ** Failers
    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.
    *** Failers
    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
    ** Failers
    addd
    adbb

/(?'abc'a|b)(?<abc>d|e)(?&abc){2}/dupnames
    bdaa
    bdab
    ** Failers
    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/
  aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\=ovector=0
  aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa4\=ovector=0

/^a.b/newline=lf
    a\rb
    a\nb>\=newline=cr
    a\x85b>\=newline=anycrlf
    ** Failers
    a\nb
    a\nb\=newline=any
    a\rb>\=newline=cr
    a\rb\=newline=any
    a\x85b\=newline=any
    a\rb>\=newline=anycrlf

/^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
    ** Failers
    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
    ** Failers
    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
    ** Failers
    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
   DEFabcABCXYZ

/(abc)(?:(?i)(?1))/
   defabcabcxyz
   DEFabcABCXYZ

/^(a)\g-2/

/^(a)\g/

/^(a)\g{0}/

/^(a)\g{3/

/^(a)\g{aa}/

/^a.b/newline=lf
    a\rb
    *** Failers
    a\nb

/.+foo/
    afoo
    ** Failers
    \r\nfoo
    \nfoo

/.+foo/newline=crlf
    afoo
    \nfoo
    ** Failers
    \r\nfoo

/.+foo/newline=any
    afoo
    ** Failers
    \nfoo
    \r\nfoo

/.+foo/s
    afoo
    \r\nfoo
    \nfoo
    
/^$/gm,newline=any
    abc\r\rxyz
    abc\n\rxyz  
    ** Failers 
    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
    ** Failers 
    XABC\=notbol

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

/xy(?+1)(abc)/B
    xyabcabc
    ** Failers
    xyabc  
    
/x(?-0)y/

/x(?-1)y/

/x(?+0)y/

/x(?+1)y/

/^(abc)?(?(-1)X|Y)/B
    abcX
    Y
    ** Failers
    abcY   
    
/^((?(+1)X|Y)(abc))+/B
    YabcXabc
    YabcXabcXabc
    ** Failers
    XabcXabc  

/(?(-1)a)/B

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

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

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

/(?<A>tom|bon)-\k{A}/
    tom-tom
    bon-bon 
    ** Failers
    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
    ** Failers
    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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/(\r|\n)A/newline=crlf
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    ** Failers
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/(*CR)a.b/newline=lf
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    ** Failers
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/(*LF)a.b/newline=CRLF
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    ** Failers
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/(*CRLF)a.b/
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    ** Failers
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/(*ANYCRLF)a.b/newline=CR
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/(*ANY)a.b/newline=cr
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/a\Rb/I,bsr=unicode
    a\rb
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    a\r\nb
    a\x85b
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/a\R?b/I,bsr=anycrlf
    a\rb
    a\nb
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    ** Failers
    a\x85b
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/a\R?b/I,bsr=unicode
    a\rb
    a\nb
    a\r\nb
    a\x85b
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    ** Failers 
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/a\R{2,4}b/I,bsr=anycrlf
    a\r\n\nb
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/a\R{2,4}b/I,bsr=unicode
    a\r\rb
    a\n\n\nb
    a\r\n\n\r\rb
    a\x85\x85b
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    a\r\r\r\r\rb 
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    a\x0b\x0bb\=bsr=anycrlf
 
/(*BSR_ANYCRLF)a\Rb/I
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/(*BSR_ANYCRLF)(*CRLF)a\Rb/I
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/(Y)X\1{2,4}+b/
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    xyzabc
    xyzabc\=notempty
    xyzabc\=notempty_atstart
    xyz\=notempty_atstart
    ** Failers 
    xyz\=notempty

/^a?b?/aftertext
    xyz
    xyzabc
    ** Failers 
    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
    ** Failers 
    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 
    ** Failers 
    b"11111
    a"11111 
    
/^(?|(a)(b)(c)(?<D>d)|(?<D>e)) (?('D')X|Y)/IBx,dupnames
    abcdX
    eX
    ** Failers
    abcdY
    ey     
    
/(?<A>a) (b)(c)  (?<A>d  (?(R&A)$ | (?4)) )/IBx,dupnames
    abcdd
    ** Failers
    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

# 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
    XABD
    BAD
    ABXABD  
    ** Failers 
    ABX 
    BAXBAD  

/(\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
    cat

/i(?(DEFINE)(?<s>a))/I
    i
    
/()i(?(1)a)/I
    ia

/(?i)a(?-i)b|c/B
    XabX
    XAbX
    CcC 
    ** Failers
    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 

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

/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
    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
    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
    ** Failers
    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
    ** Failers
    DEFGABC\=no_start_optimize
    
/^(ab (c+(*THEN)cd) | xyz)/x
    abcccd  

/^(ab (c+(*PRUNE)cd) | xyz)/x
    abcccd  

/^(ab (c+(*FAIL)cd) | xyz)/x
    abcccd  
    
# Perl gets some of these wrong

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

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

/(.(*ACCEPT))5/
    abcde

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

/A\NB./B
    ACBD
    *** Failers
    A\nB
    ACB\n   

/A\NB./Bs
    ACBD
    ACB\n 
    *** Failers
    A\nB  
  
/A\NB/newline=crlf
    A\nB
    A\rB
    ** Failers
    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
    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
    abc\=ps
    abc\=ph

/.+/
    abc\=offset=0
    abc\=offset=1
    abc\=offset=2
    abc\=offset=3
    abc\=offset=4
    abc\=offset=-4 

/^\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
    ** Failers 
    aaaa

/^(?:a)*+(\w)/
    aaaaX
    ** Failers 
    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
    ** Failers 
    b 

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

/^.*?(?(?=a)a|b(*THEN)c)/
    ba

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

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

/^.*?(?(?=a)a(*THEN)b)c/
    ac

/^.*?(a(*THEN)b)c/
    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
    D
     
/(*:A)A+(*SKIP:A)(B|Z)/mark
    AAAC

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

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

/^(?>a)++/
    aa\=find_limits
    aaaaaaaaa\=find_limits
    
/(a)(?1)++/
    aa\=find_limits
    aaaaaaaaa\=find_limits

/(?:(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

/((?2))((?1))/
    abc

/((?(R2)a+|(?1)b))/
    aaaabcde

/(?(R)a*(?1)|((?R))b)/
    aaaabcde

/(a+|(?R)b)/

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

/.(*F)/
    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
    \=notempty_atstart
    abc\=notempty_atstart
    bbb\=notempty_atstart

/(*ACCEPT)a/I,aftertext
    bax

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

/a(?:.)*?a/ims
    abbbbbbbbbbbbbbbbbbbbba\=find_limits
    
/a(?:.(*THEN))*?a/ims
    abbbbbbbbbbbbbbbbbbbbba\=find_limits

/a(?:.(*THEN:ABC))*?a/ims
    abbbbbbbbbbbbbbbbbbbbba\=find_limits

/^(?>a+)(?>(z+))\w/B
    aaaazzzzb
    ** Failers
    aazz  

/(.)(\1|a(?2))/
    bab
    
/\1|(.)(?R)\1/
    cbbbc
    
/(.)((?(1)c|a)|a(?2))/
    baa  

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

/(a\1z)/B

/^(?>a+)(?>b+)(?>c+)(?>d+)(?>e+)/
     aabbccddee\=find_limits

/^(?>(a+))(?>(b+))(?>(c+))(?>(d+))(?>(e+))/
     aabbccddee\=find_limits

/^(?>(a+))(?>b+)(?>(c+))(?>d+)(?>(e+))/
     aabbccddee\=find_limits

/^a\x41z/alt_bsux,allow_empty_class,match_unset_backref,dupnames
    aAz
    *** Failers
    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
    *** Failers
    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
    *** Failers
    aAz

/^a\U0041z/alt_bsux,allow_empty_class,match_unset_backref,dupnames
    aU0041z
    *** Failers
    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 
    ** Failers
    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 
    ** Failers 
    abc

/(q|b)(*:m)f|a(*:n)w/mark
    aw 
    ** Failers 
    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/
    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)../
     ac
     ad 

/^(?=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

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

/(*LIMIT_MATCH=12bc)abc/

/(*LIMIT_MATCH=4294967290)abc/

/(*LIMIT_RECURSION=4294967280)abc/I

/(a+)*zz/
    aaaaaaaaaaaaaz
    aaaaaaaaaaaaaz\=match_limit=3000

/(a+)*zz/
    aaaaaaaaaaaaaz\=recursion_limit=10

/(*LIMIT_MATCH=3000)(a+)*zz/I
    aaaaaaaaaaaaaz
    aaaaaaaaaaaaaz\=match_limit=60000

/(*LIMIT_MATCH=60000)(*LIMIT_MATCH=3000)(a+)*zz/I
    aaaaaaaaaaaaaz

/(*LIMIT_MATCH=60000)(a+)*zz/I
    aaaaaaaaaaaaaz
    aaaaaaaaaaaaaz\=match_limit=3000

/(*LIMIT_RECURSION=10)(a+)*zz/I
    aaaaaaaaaaaaaz
    aaaaaaaaaaaaaz\=recursion_limit=1000

/(*LIMIT_RECURSION=10)(*LIMIT_RECURSION=1000)(a+)*zz/I
    aaaaaaaaaaaaaz

/(*LIMIT_RECURSION=1000)(a+)*zz/I
    aaaaaaaaaaaaaz
    aaaaaaaaaaaaaz\=recursion_limit=10

# 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.

/\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+$/Bx

/\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+$/Bx

/\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+$/Bx

/\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+$/Bx

/\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+$/Bx

/\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+$/Bx

/\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+$/Bx

/\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+$/Bx

/\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+$/Bx

/\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+$/Bx

/\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+$/Bx

/\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+$/Bx

/ 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+$/Bx

/\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+$/Bx

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

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

/\D+$  \d+$  \S+$  \s+$  \W+$  \w+$  \C+$  \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  
    ** Failers
    no reduction
    Alfred Winifred
    
/[a[:<:]] should give error/

/(?=ab\K)/aftertext
    abcd

/abcd/newline=lf,firstline
    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
    *** Failers
    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 

# End of testinput2