/(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]/

 /[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

 /abc/IP

     abc

     *** Failers

 /^abc|def/IP

     abcdef

     abcdef\B

 /.*((abc)$|(def))/IP

     defabc

     \Zdefabc

 /the quick brown fox/IP

     the quick brown fox

     *** Failers

     The Quick Brown Fox

 /the quick brown fox/IPi

     the quick brown fox

     The Quick Brown Fox

 /abc.def/IP

     *** Failers

     abc\ndef

 /abc$/IP

     abc

     abc\n

 /(abc)\2/IP

 /(abc\1)/IP

     abc

 /)/

 /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 I think Perl 5.005_02 gets the setting of $1 wrong/I

 /^(a\1?){4}$/I

     aaaaaa

 /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/\P

 /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

 /\Biss\B/I+P

     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

 /a*(b+)(z)(z)/IP

     aaaabbbbzzzz

     aaaabbbbzzzz\O0

     aaaabbbbzzzz\O1

     aaaabbbbzzzz\O2

     aaaabbbbzzzz\O3

     aaaabbbbzzzz\O4

     aaaabbbbzzzz\O5

 /^.?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

     \