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testinput2
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/-- This set of tests is not Perl-compatible. It checks on special features
of PCRE's API, error diagnostics, and the compiled code of some patterns.
It also checks the non-Perl syntax the PCRE supports (Python, .NET,
Oniguruma). Finally, there are some tests where PCRE and Perl differ,
either because PCRE can't be compatible, or there is a possible Perl
bug.
NOTE: This is a non-UTF set of tests. When UTF support is needed, use
test 5, and if Unicode Property Support is needed, use test 7. --/
/(a)b|/I
/abc/I
abc
defabc
\Aabc
*** Failers
\Adefabc
ABC
/^abc/I
abc
\Aabc
*** Failers
defabc
\Adefabc
/a+bc/I
/a*bc/I
/a{3}bc/I
/(abc|a+z)/I
/^abc$/I
abc
*** Failers
def\nabc
/ab\idef/X
/(?X)ab\idef/X
/x{5,4}/
/z{65536}/
/[abcd/
/(?X)[\B]/
/(?X)[\R]/
/(?X)[\X]/
/[\B]/BZ
/[\R]/BZ
/[\X]/BZ
/[z-a]/
/^*/
/(abc/
/(?# abc/
/(?z)abc/
/.*b/I
/.*?b/I
/cat|dog|elephant/I
this sentence eventually mentions a cat
this sentences rambles on and on for a while and then reaches elephant
/cat|dog|elephant/IS
this sentence eventually mentions a cat
this sentences rambles on and on for a while and then reaches elephant
/cat|dog|elephant/IiS
this sentence eventually mentions a CAT cat
this sentences rambles on and on for a while to elephant ElePhant
/a|[bcd]/IS
/(a|[^\dZ])/IS
/(a|b)*[\s]/IS
/(ab\2)/
/{4,5}abc/
/(a)(b)(c)\2/I
abcb
\O0abcb
\O3abcb
\O6abcb
\O9abcb
\O12abcb
/(a)bc|(a)(b)\2/I
abc
\O0abc
\O3abc
\O6abc
aba
\O0aba
\O3aba
\O6aba
\O9aba
\O12aba
/abc$/IE
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/IA
the quick brown fox
*** Failers
this is a line with the quick brown fox
/ab(?z)cd/
/^abc|def/I
abcdef
abcdef\B
/.*((abc)$|(def))/I
defabc
\Zdefabc
/)/
/a[]b/
/[^aeiou ]{3,}/I
co-processors, and for
/<.*>/I
abc<def>ghi<klm>nop
/<.*?>/I
abc<def>ghi<klm>nop
/<.*>/IU
abc<def>ghi<klm>nop
/(?U)<.*>/I
abc<def>ghi<klm>nop
/<.*?>/IU
abc<def>ghi<klm>nop
/={3,}/IU
abc========def
/(?U)={3,}?/I
abc========def
/(?<!bar|cattle)foo/I
foo
catfoo
*** Failers
the barfoo
and cattlefoo
/(?<=a+)b/
/(?<=aaa|b{0,3})b/
/(?<!(foo)a\1)bar/
/(?i)abc/I
/(a|(?m)a)/I
/(?i)^1234/I
/(^b|(?i)^d)/I
/(?s).*/I
/[abcd]/IS
/(?i)[abcd]/IS
/(?m)[xy]|(b|c)/IS
/(^a|^b)/Im
/(?i)(^a|^b)/Im
/(a)(?(1)a|b|c)/
/(?(?=a)a|b|c)/
/(?(1a)/
/(?(1a))/
/(?(?i))/
/(?(abc))/
/(?(?<ab))/
/((?s)blah)\s+\1/I
/((?i)blah)\s+\1/I
/((?i)b)/IDZS
/(a*b|(?i:c*(?-i)d))/IS
/a$/I
a
a\n
*** Failers
\Za
\Za\n
/a$/Im
a
a\n
\Za\n
*** Failers
\Za
/\Aabc/Im
/^abc/Im
/^((a+)(?U)([ab]+)(?-U)([bc]+)(\w*))/I
aaaaabbbbbcccccdef
/(?<=foo)[ab]/IS
/(?<!foo)(alpha|omega)/IS
/(?!alphabet)[ab]/IS
/(?<=foo\n)^bar/Im
foo\nbarbar
***Failers
rhubarb
barbell
abc\nbarton
/^(?<=foo\n)bar/Im
foo\nbarbar
***Failers
rhubarb
barbell
abc\nbarton
/(?>^abc)/Im
abc
def\nabc
*** Failers
defabc
/(?<=ab(c+)d)ef/
/(?<=ab(?<=c+)d)ef/
/(?<=ab(c|de)f)g/
/The next three are in testinput2 because they have variable length branches/
/(?<=bullock|donkey)-cart/I
the bullock-cart
a donkey-cart race
*** Failers
cart
horse-and-cart
/(?<=ab(?i)x|y|z)/I
/(?>.*)(?<=(abcd)|(xyz))/I
alphabetabcd
endingxyz
/(?<=ab(?i)x(?-i)y|(?i)z|b)ZZ/I
abxyZZ
abXyZZ
ZZZ
zZZ
bZZ
BZZ
*** Failers
ZZ
abXYZZ
zzz
bzz
/(?<!(foo)a)bar/I
bar
foobbar
*** Failers
fooabar
/This one is here because Perl 5.005_02 doesn't fail it/I
/^(a)?(?(1)a|b)+$/I
*** Failers
a
/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\C2
abcd\C5
/(.{20})/I
abcdefghijklmnopqrstuvwxyz
abcdefghijklmnopqrstuvwxyz\C1
abcdefghijklmnopqrstuvwxyz\G1
/(.{15})/I
abcdefghijklmnopqrstuvwxyz
abcdefghijklmnopqrstuvwxyz\C1\G1
/(.{16})/I
abcdefghijklmnopqrstuvwxyz
abcdefghijklmnopqrstuvwxyz\C1\G1\L
/^(a|(bc))de(f)/I
adef\G1\G2\G3\G4\L
bcdef\G1\G2\G3\G4\L
adefghijk\C0
/^abc\00def/I
abc\00def\L\C0
/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/IDZ
/.*X/IDZs
/(.*X|^B)/IDZ
/(.*X|^B)/IDZs
/(?s)(.*X|^B)/IDZ
/(?s:.*X|^B)/IDZ
/\Biss\B/I+
Mississippi
/iss/IG+
Mississippi
/\Biss\B/IG+
Mississippi
/\Biss\B/Ig+
Mississippi
*** Failers
Mississippi\A
/(?<=[Ms])iss/Ig+
Mississippi
/(?<=[Ms])iss/IG+
Mississippi
/^iss/Ig+
ississippi
/.*iss/Ig+
abciss\nxyzisspqr
/.i./I+g
Mississippi
Mississippi\A
Missouri river
Missouri river\A
/^.is/I+g
Mississippi
/^ab\n/Ig+
ab\nab\ncd
/^ab\n/Img+
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
\N
/|-/I
abcd
-abc
\Nab-c
*** Failers
\Nabc
/^.?abcd/IS
/\( # ( at start
(?: # Non-capturing bracket
(?>[^()]+) # Either a sequence of non-brackets (no backtracking)
| # Or
(?R) # Recurse - i.e. nested bracketed string
)* # Zero or more contents
\) # 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
/\( ( (?>[^()]+) | (?R) )* \) /Ixg
(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:]]/DZ
/^[[:^alnum:]]/DZ
/^[[:alpha:]]/DZ
/^[[:^alpha:]]/DZ
/[_[:alpha:]]/IS
/^[[:ascii:]]/DZ
/^[[:^ascii:]]/DZ
/^[[:blank:]]/DZ
/^[[:^blank:]]/DZ
/[\n\x0b\x0c\x0d[:blank:]]/IS
/^[[:cntrl:]]/DZ
/^[[:digit:]]/DZ
/^[[:graph:]]/DZ
/^[[:lower:]]/DZ
/^[[:print:]]/DZ
/^[[:punct:]]/DZ
/^[[:space:]]/DZ
/^[[:upper:]]/DZ
/^[[:xdigit:]]/DZ
/^[[:word:]]/DZ
/^[[:^cntrl:]]/DZ
/^[12[:^digit:]]/DZ
/^[[:^blank:]]/DZ
/[01[:alpha:]%]/DZ
/[[.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/I
/(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\w+)\s+(\270)/I
\O900 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 ABC ABC
/This one's here because Perl does this differently and PCRE can't at present/I
/(main(O)?)+/I
mainmain
mainOmain
/These are all cases where Perl does it differently (nested captures)/I
/^(a(b)?)+$/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))?)+$/I
aabbbbaa
/--------------------------------------------------------------------/I
/#/IxDZ
/a#/IxDZ
/[\s]/DZ
/[\S]/DZ
/a(?i)b/DZ
ab
aB
*** Failers
AB
/(a(?i)b)/DZ
ab
aB
*** Failers
AB
/ (?i)abc/IxDZ
/#this is a comment
(?i)abc/IxDZ
/123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890/DZ
/\Q123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890/DZ
/\Q\E/DZ
\
/\Q\Ex/DZ
/ \Q\E/DZ
/a\Q\E/DZ
abc
bca
bac
/a\Q\Eb/DZ
abc
/\Q\Eabc/DZ
/x*+\w/DZ
*** Failers
xxxxx
/x?+/DZ
/x++/DZ
/x{1,3}+/DZ
/(x)*+/DZ
/^(\w++|\s++)*$/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}+/DZ
/a+?+/I
/a{2,3}?+b/I
/(?U)a+?+/I
/a{2,3}?+b/IU
/x(?U)a++b/DZ
xaaaab
/(?U)xa++b/DZ
xaaaab
/^((a+)(?U)([ab]+)(?-U)([bc]+)(\w*))/DZ
/^x(?U)a+b/DZ
/^x(?U)(a+)b/DZ
/[.x.]/I
/[=x=]/I
/[:x:]/I
/\l/I
/\L/I
/\N{name}/I
/\u/I
/\U/I
/[/I
/[a-/I
/[[:space:]/I
/[\s]/IDZ
/[[:space:]]/IDZ
/[[:space:]abcde]/IDZ
/< (?: (?(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|IDZ
|\$\<\.X\+ix\[d1b\!H\#\?vV0vrK\:ZH1\=2M\>iV\;\?aPhFB\<\*vW\@QW\@sO9\}cfZA\-i\'w\%hKd6gt1UJP\,15_\#QY\$M\^Mss_U\/\]\&LK9\[5vQub\^w\[KDD\<EjmhUZ\?\.akp2dF\>qmj\;2\}YWFdYx\.Ap\]hjCPTP\(n28k\+3\;o\&WXqs\/gOXdr\$\:r\'do0\;b4c\(f_Gr\=\"\\4\)\[01T7ajQJvL\$W\~mL_sS\/4h\:x\*\[ZN\=KLs\&L5zX\/\/\>it\,o\:aU\(\;Z\>pW\&T7oP\'2K\^E\:x9\'c\[\%z\-\,64JQ5AeH_G\#KijUKghQw\^\\vea3a\?kka_G\$8\#\`\*kynsxzBLru\'\]k_\[7FrVx\}\^\=\$blx\>s\-N\%j\;D\*aZDnsw\:YKZ\%Q\.Kne9\#hP\?\+b3\(SOvL\,\^\;\&u5\@\?5C5Bhb\=m\-vEh_L15Jl\]U\)0RP6\{q\%L\^_z5E\'Dw6X\b|IDZ
/(.*)\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/IiI
/(?=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]/IS
/[^a]/I
/\d456/I
/\d456/IS
/a^b/I
/^a/Im
abcde
xy\nabc
*** Failers
xyabc
/c|abc/I