/[pcre]/code/trunk/testdata/testoutput2
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Revision 73 - (hide annotations) (download)
Sat Feb 24 21:40:30 2007 UTC (6 years, 2 months ago) by nigel
File size: 86022 byte(s) 
Load pcre-4.5 into code/trunk.
1 nigel 73 PCRE version 4.5 01-December-2003
2 nigel 41
3     /(a)b|/
4 nigel 43 Capturing subpattern count = 1
5 nigel 41 No options
6     No first char
7 nigel 43 No need char
8 nigel 41
9     /abc/
10 nigel 43 Capturing subpattern count = 0
11 nigel 41 No options
12     First char = 'a'
13 nigel 43 Need char = 'c'
14 nigel 41 abc
15     0: abc
16     defabc
17     0: abc
18     \Aabc
19     0: abc
20     *** Failers
21     No match
22     \Adefabc
23     No match
24     ABC
25     No match
26    
27     /^abc/
28 nigel 43 Capturing subpattern count = 0
29 nigel 41 Options: anchored
30     No first char
31 nigel 65 No need char
32 nigel 41 abc
33     0: abc
34     \Aabc
35     0: abc
36     *** Failers
37     No match
38     defabc
39     No match
40     \Adefabc
41     No match
42    
43     /a+bc/
44 nigel 43 Capturing subpattern count = 0
45 nigel 41 No options
46     First char = 'a'
47 nigel 43 Need char = 'c'
48 nigel 41
49     /a*bc/
50 nigel 43 Capturing subpattern count = 0
51 nigel 41 No options
52     No first char
53 nigel 43 Need char = 'c'
54 nigel 41
55     /a{3}bc/
56 nigel 43 Capturing subpattern count = 0
57 nigel 41 No options
58     First char = 'a'
59 nigel 43 Need char = 'c'
60 nigel 41
61     /(abc|a+z)/
62 nigel 43 Capturing subpattern count = 1
63 nigel 41 No options
64     First char = 'a'
65 nigel 43 No need char
66 nigel 41
67     /^abc$/
68 nigel 43 Capturing subpattern count = 0
69 nigel 41 Options: anchored
70     No first char
71 nigel 65 No need char
72 nigel 41 abc
73     0: abc
74     *** Failers
75     No match
76     def\nabc
77     No match
78    
79     /ab\gdef/X
80     Failed: unrecognized character follows \ at offset 3
81    
82     /(?X)ab\gdef/X
83     Failed: unrecognized character follows \ at offset 7
84    
85     /x{5,4}/
86     Failed: numbers out of order in {} quantifier at offset 5
87    
88     /z{65536}/
89     Failed: number too big in {} quantifier at offset 7
90    
91     /[abcd/
92     Failed: missing terminating ] for character class at offset 5
93    
94 nigel 63 /(?X)[\B]/
95     Failed: invalid escape sequence in character class at offset 6
96 nigel 41
97     /[z-a]/
98     Failed: range out of order in character class at offset 3
99    
100     /^*/
101     Failed: nothing to repeat at offset 1
102    
103     /(abc/
104     Failed: missing ) at offset 4
105    
106     /(?# abc/
107     Failed: missing ) after comment at offset 7
108    
109     /(?z)abc/
110     Failed: unrecognized character after (? at offset 2
111    
112     /.*b/
113 nigel 43 Capturing subpattern count = 0
114 nigel 41 No options
115     First char at start or follows \n
116 nigel 43 Need char = 'b'
117 nigel 41
118     /.*?b/
119 nigel 43 Capturing subpattern count = 0
120 nigel 41 No options
121     First char at start or follows \n
122 nigel 43 Need char = 'b'
123 nigel 41
124     /cat|dog|elephant/
125 nigel 43 Capturing subpattern count = 0
126 nigel 41 No options
127     No first char
128 nigel 43 No need char
129 nigel 41 this sentence eventually mentions a cat
130     0: cat
131     this sentences rambles on and on for a while and then reaches elephant
132     0: elephant
133    
134     /cat|dog|elephant/S
135 nigel 43 Capturing subpattern count = 0
136 nigel 41 No options
137     No first char
138 nigel 43 No need char
139 nigel 41 Starting character set: c d e
140     this sentence eventually mentions a cat
141     0: cat
142     this sentences rambles on and on for a while and then reaches elephant
143     0: elephant
144    
145     /cat|dog|elephant/iS
146 nigel 43 Capturing subpattern count = 0
147 nigel 41 Options: caseless
148     No first char
149 nigel 43 No need char
150 nigel 41 Starting character set: C D E c d e
151     this sentence eventually mentions a CAT cat
152     0: CAT
153     this sentences rambles on and on for a while to elephant ElePhant
154     0: elephant
155    
156     /a|[bcd]/S
157 nigel 43 Capturing subpattern count = 0
158 nigel 41 No options
159     No first char
160 nigel 43 No need char
161 nigel 41 Starting character set: a b c d
162    
163     /(a|[^\dZ])/S
164 nigel 43 Capturing subpattern count = 1
165 nigel 41 No options
166     No first char
167 nigel 43 No need char
168 nigel 41 Starting character set: \x00 \x01 \x02 \x03 \x04 \x05 \x06 \x07 \x08 \x09 \x0a
169     \x0b \x0c \x0d \x0e \x0f \x10 \x11 \x12 \x13 \x14 \x15 \x16 \x17 \x18 \x19
170     \x1a \x1b \x1c \x1d \x1e \x1f \x20 ! " # $ % & ' ( ) * + , - . / : ; < = >
171     ? @ A B C D E F G H I J K L M N O P Q R S T U V W X Y [ \ ] ^ _ ` a b c d
172     e f g h i j k l m n o p q r s t u v w x y z { | } ~ \x7f \x80 \x81 \x82 \x83
173     \x84 \x85 \x86 \x87 \x88 \x89 \x8a \x8b \x8c \x8d \x8e \x8f \x90 \x91 \x92
174     \x93 \x94 \x95 \x96 \x97 \x98 \x99 \x9a \x9b \x9c \x9d \x9e \x9f \xa0 \xa1
175     \xa2 \xa3 \xa4 \xa5 \xa6 \xa7 \xa8 \xa9 \xaa \xab \xac \xad \xae \xaf \xb0
176     \xb1 \xb2 \xb3 \xb4 \xb5 \xb6 \xb7 \xb8 \xb9 \xba \xbb \xbc \xbd \xbe \xbf
177     \xc0 \xc1 \xc2 \xc3 \xc4 \xc5 \xc6 \xc7 \xc8 \xc9 \xca \xcb \xcc \xcd \xce
178     \xcf \xd0 \xd1 \xd2 \xd3 \xd4 \xd5 \xd6 \xd7 \xd8 \xd9 \xda \xdb \xdc \xdd
179     \xde \xdf \xe0 \xe1 \xe2 \xe3 \xe4 \xe5 \xe6 \xe7 \xe8 \xe9 \xea \xeb \xec
180     \xed \xee \xef \xf0 \xf1 \xf2 \xf3 \xf4 \xf5 \xf6 \xf7 \xf8 \xf9 \xfa \xfb
181     \xfc \xfd \xfe \xff
182    
183     /(a|b)*[\s]/S
184 nigel 43 Capturing subpattern count = 1
185 nigel 41 No options
186     No first char
187 nigel 43 No need char
188 nigel 63 Starting character set: \x09 \x0a \x0c \x0d \x20 a b
189 nigel 41
190     /(ab\2)/
191 nigel 63 Failed: reference to non-existent subpattern at offset 6
192 nigel 41
193     /{4,5}abc/
194     Failed: nothing to repeat at offset 4
195    
196     /(a)(b)(c)\2/
197 nigel 43 Capturing subpattern count = 3
198     Max back reference = 2
199 nigel 41 No options
200     First char = 'a'
201 nigel 43 Need char = 'c'
202 nigel 41 abcb
203     0: abcb
204     1: a
205     2: b
206     3: c
207     \O0abcb
208     Matched, but too many substrings
209     \O3abcb
210     Matched, but too many substrings
211     0: abcb
212     \O6abcb
213     Matched, but too many substrings
214     0: abcb
215     1: a
216     \O9abcb
217     Matched, but too many substrings
218     0: abcb
219     1: a
220     2: b
221     \O12abcb
222     0: abcb
223     1: a
224     2: b
225     3: c
226    
227     /(a)bc|(a)(b)\2/
228 nigel 43 Capturing subpattern count = 3
229     Max back reference = 2
230 nigel 41 No options
231     First char = 'a'
232 nigel 43 No need char
233 nigel 41 abc
234     0: abc
235     1: a
236     \O0abc
237     Matched, but too many substrings
238     \O3abc
239     Matched, but too many substrings
240     0: abc
241     \O6abc
242     0: abc
243     1: a
244     aba
245     0: aba
246     1: <unset>
247     2: a
248     3: b
249     \O0aba
250     Matched, but too many substrings
251     \O3aba
252     Matched, but too many substrings
253     0: aba
254     \O6aba
255     Matched, but too many substrings
256     0: aba
257     1: <unset>
258     \O9aba
259     Matched, but too many substrings
260     0: aba
261     1: <unset>
262     2: a
263     \O12aba
264     0: aba
265     1: <unset>
266     2: a
267     3: b
268    
269     /abc$/E
270 nigel 43 Capturing subpattern count = 0
271 nigel 41 Options: dollar_endonly
272     First char = 'a'
273 nigel 43 Need char = 'c'
274 nigel 41 abc
275     0: abc
276     *** Failers
277     No match
278     abc\n
279     No match
280     abc\ndef
281     No match
282    
283     /(a)(b)(c)(d)(e)\6/
284 nigel 63 Failed: reference to non-existent subpattern at offset 17
285 nigel 41
286     /the quick brown fox/
287 nigel 43 Capturing subpattern count = 0
288 nigel 41 No options
289     First char = 't'
290 nigel 43 Need char = 'x'
291 nigel 41 the quick brown fox
292     0: the quick brown fox
293     this is a line with the quick brown fox
294     0: the quick brown fox
295    
296     /the quick brown fox/A
297 nigel 43 Capturing subpattern count = 0
298 nigel 41 Options: anchored
299     No first char
300 nigel 65 No need char
301 nigel 41 the quick brown fox
302     0: the quick brown fox
303     *** Failers
304     No match
305     this is a line with the quick brown fox
306     No match
307    
308     /ab(?z)cd/
309     Failed: unrecognized character after (? at offset 4
310    
311     /^abc|def/
312 nigel 43 Capturing subpattern count = 0
313 nigel 41 No options
314     No first char
315 nigel 43 No need char
316 nigel 41 abcdef
317     0: abc
318     abcdef\B
319     0: def
320    
321     /.*((abc)$|(def))/
322 nigel 43 Capturing subpattern count = 3
323 nigel 41 No options
324     First char at start or follows \n
325 nigel 43 No need char
326 nigel 41 defabc
327     0: defabc
328     1: abc
329     2: abc
330     \Zdefabc
331     0: def
332     1: def
333     2: <unset>
334     3: def
335    
336     /abc/P
337     abc
338     0: abc
339     *** Failers
340     No match: POSIX code 17: match failed
341    
342     /^abc|def/P
343     abcdef
344     0: abc
345     abcdef\B
346     0: def
347    
348     /.*((abc)$|(def))/P
349     defabc
350     0: defabc
351     1: abc
352     2: abc
353     \Zdefabc
354     0: def
355     1: def
356     3: def
357    
358     /the quick brown fox/P
359     the quick brown fox
360     0: the quick brown fox
361     *** Failers
362     No match: POSIX code 17: match failed
363     The Quick Brown Fox
364     No match: POSIX code 17: match failed
365    
366     /the quick brown fox/Pi
367     the quick brown fox
368     0: the quick brown fox
369     The Quick Brown Fox
370     0: The Quick Brown Fox
371    
372     /abc.def/P
373     *** Failers
374     No match: POSIX code 17: match failed
375     abc\ndef
376     No match: POSIX code 17: match failed
377    
378     /abc$/P
379     abc
380     0: abc
381     abc\n
382     0: abc
383    
384     /(abc)\2/P
385     Failed: POSIX code 15: bad back reference at offset 7
386    
387     /(abc\1)/P
388     abc
389     No match: POSIX code 17: match failed
390    
391     /)/
392     Failed: unmatched parentheses at offset 0
393    
394     /a[]b/
395     Failed: missing terminating ] for character class at offset 4
396    
397     /[^aeiou ]{3,}/
398 nigel 43 Capturing subpattern count = 0
399 nigel 41 No options
400     No first char
401 nigel 43 No need char
402 nigel 41 co-processors, and for
403     0: -pr
404    
405     /<.*>/
406 nigel 43 Capturing subpattern count = 0
407 nigel 41 No options
408     First char = '<'
409 nigel 43 Need char = '>'
410 nigel 41 abc<def>ghi<klm>nop
411     0: <def>ghi<klm>
412    
413     /<.*?>/
414 nigel 43 Capturing subpattern count = 0
415 nigel 41 No options
416     First char = '<'
417 nigel 43 Need char = '>'
418 nigel 41 abc<def>ghi<klm>nop
419     0: <def>
420    
421     /<.*>/U
422 nigel 43 Capturing subpattern count = 0
423 nigel 41 Options: ungreedy
424     First char = '<'
425 nigel 43 Need char = '>'
426 nigel 41 abc<def>ghi<klm>nop
427     0: <def>
428    
429 nigel 63 /(?U)<.*>/
430 nigel 43 Capturing subpattern count = 0
431 nigel 41 Options: ungreedy
432     First char = '<'
433 nigel 43 Need char = '>'
434 nigel 41 abc<def>ghi<klm>nop
435     0: <def>
436    
437     /<.*?>/U
438 nigel 43 Capturing subpattern count = 0
439 nigel 41 Options: ungreedy
440     First char = '<'
441 nigel 43 Need char = '>'
442 nigel 41 abc<def>ghi<klm>nop
443     0: <def>ghi<klm>
444    
445     /={3,}/U
446 nigel 43 Capturing subpattern count = 0
447 nigel 41 Options: ungreedy
448     First char = '='
449 nigel 43 Need char = '='
450 nigel 41 abc========def
451     0: ===
452    
453     /(?U)={3,}?/
454 nigel 43 Capturing subpattern count = 0
455 nigel 41 Options: ungreedy
456     First char = '='
457 nigel 43 Need char = '='
458 nigel 41 abc========def
459     0: ========
460    
461     /(?<!bar|cattle)foo/
462 nigel 43 Capturing subpattern count = 0
463 nigel 41 No options
464     First char = 'f'
465 nigel 43 Need char = 'o'
466 nigel 41 foo
467     0: foo
468     catfoo
469     0: foo
470     *** Failers
471     No match
472     the barfoo
473     No match
474     and cattlefoo
475     No match
476    
477     /(?<=a+)b/
478     Failed: lookbehind assertion is not fixed length at offset 6
479    
480     /(?<=aaa|b{0,3})b/
481     Failed: lookbehind assertion is not fixed length at offset 14
482    
483     /(?<!(foo)a\1)bar/
484     Failed: lookbehind assertion is not fixed length at offset 12
485    
486     /(?i)abc/
487 nigel 43 Capturing subpattern count = 0
488 nigel 41 Options: caseless
489 nigel 63 First char = 'a' (caseless)
490     Need char = 'c' (caseless)
491 nigel 41
492     /(a|(?m)a)/
493 nigel 43 Capturing subpattern count = 1
494 nigel 41 No options
495     First char = 'a'
496 nigel 43 No need char
497 nigel 41
498     /(?i)^1234/
499 nigel 43 Capturing subpattern count = 0
500 nigel 41 Options: anchored caseless
501     No first char
502 nigel 65 No need char
503 nigel 41
504     /(^b|(?i)^d)/
505 nigel 43 Capturing subpattern count = 1
506 nigel 41 Options: anchored
507     Case state changes
508     No first char
509 nigel 43 No need char
510 nigel 41
511     /(?s).*/
512 nigel 43 Capturing subpattern count = 0
513 nigel 41 Options: anchored dotall
514     No first char
515 nigel 43 No need char
516 nigel 41
517     /[abcd]/S
518 nigel 43 Capturing subpattern count = 0
519 nigel 41 No options
520     No first char
521 nigel 43 No need char
522 nigel 41 Starting character set: a b c d
523    
524     /(?i)[abcd]/S
525 nigel 43 Capturing subpattern count = 0
526 nigel 41 Options: caseless
527     No first char
528 nigel 43 No need char
529 nigel 41 Starting character set: A B C D a b c d
530    
531     /(?m)[xy]|(b|c)/S
532 nigel 43 Capturing subpattern count = 1
533 nigel 41 Options: multiline
534     No first char
535 nigel 43 No need char
536 nigel 41 Starting character set: b c x y
537    
538     /(^a|^b)/m
539 nigel 43 Capturing subpattern count = 1
540 nigel 41 Options: multiline
541     First char at start or follows \n
542 nigel 43 No need char
543 nigel 41
544     /(?i)(^a|^b)/m
545 nigel 43 Capturing subpattern count = 1
546 nigel 41 Options: caseless multiline
547     First char at start or follows \n
548 nigel 43 No need char
549 nigel 41
550     /(a)(?(1)a|b|c)/
551     Failed: conditional group contains more than two branches at offset 13
552    
553     /(?(?=a)a|b|c)/
554     Failed: conditional group contains more than two branches at offset 12
555    
556     /(?(1a)/
557     Failed: malformed number after (?( at offset 4
558    
559     /(?(?i))/
560     Failed: assertion expected after (?( at offset 3
561    
562     /(?(abc))/
563     Failed: assertion expected after (?( at offset 3
564    
565     /(?(?<ab))/
566 nigel 63 Failed: unrecognized character after (?< at offset 5
567 nigel 41
568     /((?s)blah)\s+\1/
569 nigel 43 Capturing subpattern count = 1
570     Max back reference = 1
571 nigel 41 No options
572     First char = 'b'
573 nigel 43 Need char = 'h'
574 nigel 41
575     /((?i)blah)\s+\1/
576 nigel 43 Capturing subpattern count = 1
577     Max back reference = 1
578 nigel 41 No options
579     Case state changes
580 nigel 63 First char = 'b' (caseless)
581     Need char = 'h' (caseless)
582 nigel 41
583     /((?i)b)/DS
584     ------------------------------------------------------------------
585     0 16 Bra 0
586     3 8 Bra 1
587     6 01 Opt
588     8 1 b
589     11 8 Ket
590     14 00 Opt
591     16 16 Ket
592     19 End
593     ------------------------------------------------------------------
594 nigel 43 Capturing subpattern count = 1
595 nigel 41 No options
596     Case state changes
597 nigel 63 First char = 'b' (caseless)
598     No need char
599     Study returned NULL
600 nigel 41
601     /(a*b|(?i:c*(?-i)d))/S
602 nigel 43 Capturing subpattern count = 1
603 nigel 41 No options
604     Case state changes
605     No first char
606 nigel 43 No need char
607 nigel 41 Starting character set: C a b c d
608    
609     /a$/
610 nigel 43 Capturing subpattern count = 0
611 nigel 41 No options
612     First char = 'a'
613 nigel 43 No need char
614 nigel 41 a
615     0: a
616     a\n
617     0: a
618     *** Failers
619     No match
620     \Za
621     No match
622     \Za\n
623     No match
624    
625     /a$/m
626 nigel 43 Capturing subpattern count = 0
627 nigel 41 Options: multiline
628     First char = 'a'
629 nigel 43 No need char
630 nigel 41 a
631     0: a
632     a\n
633     0: a
634     \Za\n
635     0: a
636     *** Failers
637     No match
638     \Za
639     No match
640    
641     /\Aabc/m
642 nigel 43 Capturing subpattern count = 0
643 nigel 41 Options: anchored multiline
644     No first char
645 nigel 65 No need char
646 nigel 41
647     /^abc/m
648 nigel 43 Capturing subpattern count = 0
649 nigel 41 Options: multiline
650     First char at start or follows \n
651 nigel 43 Need char = 'c'
652 nigel 41
653     /^((a+)(?U)([ab]+)(?-U)([bc]+)(\w*))/
654 nigel 43 Capturing subpattern count = 5
655 nigel 41 Options: anchored
656     No first char
657 nigel 65 No need char
658 nigel 41 aaaaabbbbbcccccdef
659     0: aaaaabbbbbcccccdef
660     1: aaaaabbbbbcccccdef
661     2: aaaaa
662     3: b
663     4: bbbbccccc
664     5: def
665    
666     /(?<=foo)[ab]/S
667 nigel 43 Capturing subpattern count = 0
668 nigel 41 No options
669     No first char
670 nigel 43 No need char
671 nigel 41 Starting character set: a b
672    
673     /(?<!foo)(alpha|omega)/S
674 nigel 43 Capturing subpattern count = 1
675 nigel 41 No options
676     No first char
677 nigel 43 Need char = 'a'
678 nigel 41 Starting character set: a o
679    
680     /(?!alphabet)[ab]/S
681 nigel 43 Capturing subpattern count = 0
682 nigel 41 No options
683     No first char
684 nigel 43 No need char
685 nigel 41 Starting character set: a b
686    
687     /(?<=foo\n)^bar/m
688 nigel 43 Capturing subpattern count = 0
689 nigel 41 Options: multiline
690     First char at start or follows \n
691 nigel 43 Need char = 'r'
692 nigel 41
693     /(?>^abc)/m
694 nigel 43 Capturing subpattern count = 0
695 nigel 41 Options: multiline
696     First char at start or follows \n
697 nigel 43 Need char = 'c'
698 nigel 41 abc
699     0: abc
700     def\nabc
701     0: abc
702     *** Failers
703     No match
704     defabc
705     No match
706    
707     /(?<=ab(c+)d)ef/
708     Failed: lookbehind assertion is not fixed length at offset 11
709    
710     /(?<=ab(?<=c+)d)ef/
711     Failed: lookbehind assertion is not fixed length at offset 12
712    
713     /(?<=ab(c|de)f)g/
714     Failed: lookbehind assertion is not fixed length at offset 13
715    
716     /The next three are in testinput2 because they have variable length branches/
717 nigel 43 Capturing subpattern count = 0
718 nigel 41 No options
719     First char = 'T'
720 nigel 43 Need char = 's'
721 nigel 41
722     /(?<=bullock|donkey)-cart/
723 nigel 43 Capturing subpattern count = 0
724 nigel 41 No options
725     First char = '-'
726 nigel 43 Need char = 't'
727 nigel 41 the bullock-cart
728     0: -cart
729     a donkey-cart race
730     0: -cart
731     *** Failers
732     No match
733     cart
734     No match
735     horse-and-cart
736     No match
737    
738     /(?<=ab(?i)x|y|z)/
739 nigel 43 Capturing subpattern count = 0
740 nigel 41 No options
741     Case state changes
742     No first char
743 nigel 43 No need char
744 nigel 41
745     /(?>.*)(?<=(abcd)|(xyz))/
746 nigel 43 Capturing subpattern count = 2
747 nigel 41 No options
748     First char at start or follows \n
749 nigel 43 No need char
750 nigel 41 alphabetabcd
751     0: alphabetabcd
752     1: abcd
753     endingxyz
754     0: endingxyz
755     1: <unset>
756     2: xyz
757    
758     /(?<=ab(?i)x(?-i)y|(?i)z|b)ZZ/
759 nigel 43 Capturing subpattern count = 0
760 nigel 41 No options
761     Case state changes
762     First char = 'Z'
763 nigel 43 Need char = 'Z'
764 nigel 41 abxyZZ
765     0: ZZ
766     abXyZZ
767     0: ZZ
768     ZZZ
769     0: ZZ
770     zZZ
771     0: ZZ
772     bZZ
773     0: ZZ
774     BZZ
775     0: ZZ
776     *** Failers
777     No match
778     ZZ
779     No match
780     abXYZZ
781     No match
782     zzz
783     No match
784     bzz
785     No match
786    
787     /(?<!(foo)a)bar/
788 nigel 43 Capturing subpattern count = 1
789 nigel 41 No options
790     First char = 'b'
791 nigel 43 Need char = 'r'
792 nigel 41 bar
793     0: bar
794     foobbar
795     0: bar
796     *** Failers
797     No match
798     fooabar
799     No match
800    
801     /This one is here because Perl 5.005_02 doesn't fail it/
802 nigel 43 Capturing subpattern count = 0
803 nigel 41 No options
804     First char = 'T'
805 nigel 43 Need char = 't'
806 nigel 41
807     /^(a)?(?(1)a|b)+$/
808 nigel 43 Capturing subpattern count = 1
809 nigel 41 Options: anchored
810     No first char
811 nigel 43 No need char
812 nigel 41 *** Failers
813     No match
814     a
815     No match
816    
817     /This one is here because I think Perl 5.005_02 gets the setting of $1 wrong/
818 nigel 43 Capturing subpattern count = 0
819 nigel 41 No options
820     First char = 'T'
821 nigel 43 Need char = 'g'
822 nigel 41
823     /^(a\1?){4}$/
824 nigel 43 Capturing subpattern count = 1
825     Max back reference = 1
826 nigel 41 Options: anchored
827     No first char
828 nigel 65 No need char
829 nigel 41 aaaaaa
830     0: aaaaaa
831     1: aa
832    
833     /These are syntax tests from Perl 5.005/
834 nigel 43 Capturing subpattern count = 0
835 nigel 41 No options
836     First char = 'T'
837 nigel 43 Need char = '5'
838 nigel 41
839     /a[b-a]/
840     Failed: range out of order in character class at offset 4
841    
842     /a[]b/
843     Failed: missing terminating ] for character class at offset 4
844    
845     /a[/
846     Failed: missing terminating ] for character class at offset 2
847    
848     /*a/
849     Failed: nothing to repeat at offset 0
850    
851     /(*)b/
852     Failed: nothing to repeat at offset 1
853    
854     /abc)/
855     Failed: unmatched parentheses at offset 3
856    
857     /(abc/
858     Failed: missing ) at offset 4
859    
860     /a**/
861     Failed: nothing to repeat at offset 2
862    
863     /)(/
864     Failed: unmatched parentheses at offset 0
865    
866     /\1/
867 nigel 63 Failed: reference to non-existent subpattern at offset 2
868 nigel 41
869     /\2/
870 nigel 63 Failed: reference to non-existent subpattern at offset 2
871 nigel 41
872     /(a)|\2/
873 nigel 63 Failed: reference to non-existent subpattern at offset 6
874 nigel 41
875     /a[b-a]/i
876     Failed: range out of order in character class at offset 4
877    
878     /a[]b/i
879     Failed: missing terminating ] for character class at offset 4
880    
881     /a[/i
882     Failed: missing terminating ] for character class at offset 2
883    
884     /*a/i
885     Failed: nothing to repeat at offset 0
886    
887     /(*)b/i
888     Failed: nothing to repeat at offset 1
889    
890     /abc)/i
891     Failed: unmatched parentheses at offset 3
892    
893     /(abc/i
894     Failed: missing ) at offset 4
895    
896     /a**/i
897     Failed: nothing to repeat at offset 2
898    
899     /)(/i
900     Failed: unmatched parentheses at offset 0
901    
902     /:(?:/
903     Failed: missing ) at offset 4
904    
905     /(?<%)b/
906 nigel 63 Failed: unrecognized character after (?< at offset 3
907 nigel 41
908     /a(?{)b/
909     Failed: unrecognized character after (? at offset 3
910    
911     /a(?{{})b/
912     Failed: unrecognized character after (? at offset 3
913    
914     /a(?{}})b/
915     Failed: unrecognized character after (? at offset 3
916    
917     /a(?{"{"})b/
918     Failed: unrecognized character after (? at offset 3
919    
920     /a(?{"{"}})b/
921     Failed: unrecognized character after (? at offset 3
922    
923     /(?(1?)a|b)/
924     Failed: malformed number after (?( at offset 4
925    
926     /(?(1)a|b|c)/
927     Failed: conditional group contains more than two branches at offset 10
928    
929     /[a[:xyz:/
930     Failed: missing terminating ] for character class at offset 8
931    
932     /(?<=x+)y/
933     Failed: lookbehind assertion is not fixed length at offset 6
934    
935     /a{37,17}/
936     Failed: numbers out of order in {} quantifier at offset 7
937    
938     /abc/\
939     Failed: \ at end of pattern at offset 4
940    
941     /abc/\P
942     Failed: POSIX code 9: bad escape sequence at offset 4
943    
944     /abc/\i
945     Failed: \ at end of pattern at offset 4
946    
947     /(a)bc(d)/
948 nigel 43 Capturing subpattern count = 2
949 nigel 41 No options
950     First char = 'a'
951 nigel 43 Need char = 'd'
952 nigel 41 abcd
953     0: abcd
954     1: a
955     2: d
956     abcd\C2
957     0: abcd
958     1: a
959     2: d
960     2C d (1)
961     abcd\C5
962     0: abcd
963     1: a
964     2: d
965     copy substring 5 failed -7
966    
967     /(.{20})/
968 nigel 43 Capturing subpattern count = 1
969 nigel 41 No options
970     No first char
971 nigel 43 No need char
972 nigel 41 abcdefghijklmnopqrstuvwxyz
973     0: abcdefghijklmnopqrst
974     1: abcdefghijklmnopqrst
975     abcdefghijklmnopqrstuvwxyz\C1
976     0: abcdefghijklmnopqrst
977     1: abcdefghijklmnopqrst
978     copy substring 1 failed -6
979     abcdefghijklmnopqrstuvwxyz\G1
980     0: abcdefghijklmnopqrst
981     1: abcdefghijklmnopqrst
982     1G abcdefghijklmnopqrst (20)
983    
984     /(.{15})/
985 nigel 43 Capturing subpattern count = 1
986 nigel 41 No options
987     No first char
988 nigel 43 No need char
989 nigel 41 abcdefghijklmnopqrstuvwxyz
990     0: abcdefghijklmno
991     1: abcdefghijklmno
992     abcdefghijklmnopqrstuvwxyz\C1\G1
993     0: abcdefghijklmno
994     1: abcdefghijklmno
995     1C abcdefghijklmno (15)
996     1G abcdefghijklmno (15)
997    
998     /(.{16})/
999 nigel 43 Capturing subpattern count = 1
1000 nigel 41 No options
1001     No first char
1002 nigel 43 No need char
1003 nigel 41 abcdefghijklmnopqrstuvwxyz
1004     0: abcdefghijklmnop
1005     1: abcdefghijklmnop
1006     abcdefghijklmnopqrstuvwxyz\C1\G1\L
1007     0: abcdefghijklmnop
1008     1: abcdefghijklmnop
1009     copy substring 1 failed -6
1010     1G abcdefghijklmnop (16)
1011     0L abcdefghijklmnop
1012     1L abcdefghijklmnop
1013    
1014     /^(a|(bc))de(f)/
1015 nigel 43 Capturing subpattern count = 3
1016 nigel 41 Options: anchored
1017     No first char
1018 nigel 65 No need char
1019 nigel 41 adef\G1\G2\G3\G4\L
1020     0: adef
1021     1: a
1022     2: <unset>
1023     3: f
1024     1G a (1)
1025     2G (0)
1026     3G f (1)
1027     get substring 4 failed -7
1028     0L adef
1029     1L a
1030     2L
1031     3L f
1032     bcdef\G1\G2\G3\G4\L
1033     0: bcdef
1034     1: bc
1035     2: bc
1036     3: f
1037     1G bc (2)
1038     2G bc (2)
1039     3G f (1)
1040     get substring 4 failed -7
1041     0L bcdef
1042     1L bc
1043     2L bc
1044     3L f
1045     adefghijk\C0
1046     0: adef
1047     1: a
1048     2: <unset>
1049     3: f
1050     0C adef (4)
1051    
1052     /^abc\00def/
1053 nigel 43 Capturing subpattern count = 0
1054 nigel 41 Options: anchored
1055     No first char
1056 nigel 65 No need char
1057 nigel 41 abc\00def\L\C0
1058     0: abc\x00def
1059     0C abc (7)
1060     0L abc
1061    
1062     /word ((?:[a-zA-Z0-9]+ )((?:[a-zA-Z0-9]+ )((?:[a-zA-Z0-9]+ )((?:[a-zA-Z0-9]+
1063     )((?:[a-zA-Z0-9]+ )((?:[a-zA-Z0-9]+ )((?:[a-zA-Z0-9]+ )((?:[a-zA-Z0-9]+
1064     )?)?)?)?)?)?)?)?)?otherword/M
1065     Memory allocation (code space): 428
1066 nigel 43 Capturing subpattern count = 8
1067 nigel 41 No options
1068     First char = 'w'
1069 nigel 43 Need char = 'd'
1070 nigel 41
1071     /.*X/D
1072     ------------------------------------------------------------------
1073     0 8 Bra 0
1074     3 Any*
1075     5 1 X
1076     8 8 Ket
1077     11 End
1078     ------------------------------------------------------------------
1079 nigel 43 Capturing subpattern count = 0
1080 nigel 41 No options
1081     First char at start or follows \n
1082 nigel 43 Need char = 'X'
1083 nigel 41
1084     /.*X/Ds
1085     ------------------------------------------------------------------
1086     0 8 Bra 0
1087     3 Any*
1088     5 1 X
1089     8 8 Ket
1090     11 End
1091     ------------------------------------------------------------------
1092 nigel 43 Capturing subpattern count = 0
1093 nigel 41 Options: anchored dotall
1094     No first char
1095 nigel 43 Need char = 'X'
1096 nigel 41
1097     /(.*X|^B)/D
1098     ------------------------------------------------------------------
1099     0 21 Bra 0
1100     3 8 Bra 1
1101     6 Any*
1102     8 1 X
1103     11 7 Alt
1104     14 ^
1105     15 1 B
1106     18 15 Ket
1107     21 21 Ket
1108     24 End
1109     ------------------------------------------------------------------
1110 nigel 43 Capturing subpattern count = 1
1111 nigel 41 No options
1112     First char at start or follows \n
1113 nigel 43 No need char
1114 nigel 41
1115     /(.*X|^B)/Ds
1116     ------------------------------------------------------------------
1117     0 21 Bra 0
1118     3 8 Bra 1
1119     6 Any*
1120     8 1 X
1121     11 7 Alt
1122     14 ^
1123     15 1 B
1124     18 15 Ket
1125     21 21 Ket
1126     24 End
1127     ------------------------------------------------------------------
1128 nigel 43 Capturing subpattern count = 1
1129 nigel 41 Options: anchored dotall
1130     No first char
1131 nigel 43 No need char
1132 nigel 41
1133     /(?s)(.*X|^B)/D
1134     ------------------------------------------------------------------
1135     0 21 Bra 0
1136     3 8 Bra 1
1137     6 Any*
1138     8 1 X
1139     11 7 Alt
1140     14 ^
1141     15 1 B
1142     18 15 Ket
1143     21 21 Ket
1144     24 End
1145     ------------------------------------------------------------------
1146 nigel 43 Capturing subpattern count = 1
1147 nigel 41 Options: anchored dotall
1148     No first char
1149 nigel 43 No need char
1150 nigel 41
1151     /(?s:.*X|^B)/D
1152     ------------------------------------------------------------------
1153     0 27 Bra 0
1154     3 10 Bra 0
1155     6 04 Opt
1156     8 Any*
1157     10 1 X
1158     13 9 Alt
1159     16 04 Opt
1160     18 ^
1161     19 1 B
1162     22 19 Ket
1163     25 00 Opt
1164     27 27 Ket
1165     30 End
1166     ------------------------------------------------------------------
1167 nigel 43 Capturing subpattern count = 0
1168 nigel 41 No options
1169     First char at start or follows \n
1170 nigel 43 No need char
1171 nigel 41
1172     /\Biss\B/+
1173 nigel 43 Capturing subpattern count = 0
1174 nigel 41 No options
1175     First char = 'i'
1176 nigel 43 Need char = 's'
1177 nigel 41 Mississippi
1178     0: iss
1179     0+ issippi
1180    
1181     /\Biss\B/+P
1182     Mississippi
1183     0: iss
1184     0+ issippi
1185    
1186     /iss/G+
1187 nigel 43 Capturing subpattern count = 0
1188 nigel 41 No options
1189     First char = 'i'
1190 nigel 43 Need char = 's'
1191 nigel 41 Mississippi
1192     0: iss
1193     0+ issippi
1194     0: iss
1195     0+ ippi
1196    
1197     /\Biss\B/G+
1198 nigel 43 Capturing subpattern count = 0
1199 nigel 41 No options
1200     First char = 'i'
1201 nigel 43 Need char = 's'
1202 nigel 41 Mississippi
1203     0: iss
1204     0+ issippi
1205    
1206     /\Biss\B/g+
1207 nigel 43 Capturing subpattern count = 0
1208 nigel 41 No options
1209     First char = 'i'
1210 nigel 43 Need char = 's'
1211 nigel 41 Mississippi
1212     0: iss
1213     0+ issippi
1214     0: iss
1215     0+ ippi
1216     *** Failers
1217     No match
1218     Mississippi\A
1219     No match
1220    
1221     /(?<=[Ms])iss/g+
1222 nigel 43 Capturing subpattern count = 0
1223 nigel 41 No options
1224     First char = 'i'
1225 nigel 43 Need char = 's'
1226 nigel 41 Mississippi
1227     0: iss
1228     0+ issippi
1229     0: iss
1230     0+ ippi
1231    
1232     /(?<=[Ms])iss/G+
1233 nigel 43 Capturing subpattern count = 0
1234 nigel 41 No options
1235     First char = 'i'
1236 nigel 43 Need char = 's'
1237 nigel 41 Mississippi
1238     0: iss
1239     0+ issippi
1240    
1241     /^iss/g+
1242 nigel 43 Capturing subpattern count = 0
1243 nigel 41 Options: anchored
1244     No first char
1245 nigel 65 No need char
1246 nigel 41 ississippi
1247     0: iss
1248     0+ issippi
1249    
1250     /.*iss/g+
1251 nigel 43 Capturing subpattern count = 0
1252 nigel 41 No options
1253     First char at start or follows \n
1254 nigel 43 Need char = 's'
1255 nigel 41 abciss\nxyzisspqr
1256     0: abciss
1257     0+ \x0axyzisspqr
1258     0: xyziss
1259     0+ pqr
1260    
1261     /.i./+g
1262 nigel 43 Capturing subpattern count = 0
1263 nigel 41 No options
1264     No first char
1265 nigel 43 Need char = 'i'
1266 nigel 41 Mississippi
1267     0: Mis
1268     0+ sissippi
1269     0: sis
1270     0+ sippi
1271     0: sip
1272     0+ pi
1273     Mississippi\A
1274     0: Mis
1275     0+ sissippi
1276     0: sis
1277     0+ sippi
1278     0: sip
1279     0+ pi
1280     Missouri river
1281     0: Mis
1282     0+ souri river
1283     0: ri
1284     0+ river
1285     0: riv
1286     0+ er
1287     Missouri river\A
1288     0: Mis
1289     0+ souri river
1290    
1291     /^.is/+g
1292 nigel 43 Capturing subpattern count = 0
1293 nigel 41 Options: anchored
1294     No first char
1295 nigel 65 No need char
1296 nigel 41 Mississippi
1297     0: Mis
1298     0+ sissippi
1299    
1300     /^ab\n/g+
1301 nigel 43 Capturing subpattern count = 0
1302 nigel 41 Options: anchored
1303     No first char
1304 nigel 65 No need char
1305 nigel 41 ab\nab\ncd
1306     0: ab\x0a
1307     0+ ab\x0acd
1308    
1309     /^ab\n/mg+
1310 nigel 43 Capturing subpattern count = 0
1311 nigel 41 Options: multiline
1312     First char at start or follows \n
1313 nigel 43 Need char = 10
1314 nigel 41 ab\nab\ncd
1315     0: ab\x0a
1316     0+ ab\x0acd
1317     0: ab\x0a
1318     0+ cd
1319    
1320     /abc/
1321 nigel 43 Capturing subpattern count = 0
1322 nigel 41 No options
1323     First char = 'a'
1324 nigel 43 Need char = 'c'
1325 nigel 41
1326     /abc|bac/
1327 nigel 43 Capturing subpattern count = 0
1328 nigel 41 No options
1329     No first char
1330 nigel 43 Need char = 'c'
1331 nigel 41
1332     /(abc|bac)/
1333 nigel 43 Capturing subpattern count = 1
1334 nigel 41 No options
1335     No first char
1336 nigel 43 Need char = 'c'
1337 nigel 41
1338     /(abc|(c|dc))/
1339 nigel 43 Capturing subpattern count = 2
1340 nigel 41 No options
1341     No first char
1342 nigel 43 Need char = 'c'
1343 nigel 41
1344     /(abc|(d|de)c)/
1345 nigel 43 Capturing subpattern count = 2
1346 nigel 41 No options
1347     No first char
1348 nigel 43 Need char = 'c'
1349 nigel 41
1350     /a*/
1351 nigel 43 Capturing subpattern count = 0
1352 nigel 41 No options
1353     No first char
1354 nigel 43 No need char
1355 nigel 41
1356     /a+/
1357 nigel 43 Capturing subpattern count = 0
1358 nigel 41 No options
1359     First char = 'a'
1360 nigel 43 No need char
1361 nigel 41
1362     /(baa|a+)/
1363 nigel 43 Capturing subpattern count = 1
1364 nigel 41 No options
1365     No first char
1366 nigel 43 Need char = 'a'
1367 nigel 41
1368     /a{0,3}/
1369 nigel 43 Capturing subpattern count = 0
1370 nigel 41 No options
1371     No first char
1372 nigel 43 No need char
1373 nigel 41
1374     /baa{3,}/
1375 nigel 43 Capturing subpattern count = 0
1376 nigel 41 No options
1377     First char = 'b'
1378 nigel 43 Need char = 'a'
1379 nigel 41
1380     /"([^\\"]+|\\.)*"/
1381 nigel 43 Capturing subpattern count = 1
1382 nigel 41 No options
1383     First char = '"'
1384 nigel 43 Need char = '"'
1385 nigel 41
1386     /(abc|ab[cd])/
1387 nigel 43 Capturing subpattern count = 1
1388 nigel 41 No options
1389     First char = 'a'
1390 nigel 43 No need char
1391 nigel 41
1392     /(a|.)/
1393 nigel 43 Capturing subpattern count = 1
1394 nigel 41 No options
1395     No first char
1396 nigel 43 No need char
1397 nigel 41
1398     /a|ba|\w/
1399 nigel 43 Capturing subpattern count = 0
1400 nigel 41 No options
1401     No first char
1402 nigel 43 No need char
1403 nigel 41
1404     /abc(?=pqr)/
1405 nigel 43 Capturing subpattern count = 0
1406 nigel 41 No options
1407     First char = 'a'
1408 nigel 43 Need char = 'r'
1409 nigel 41
1410     /...(?<=abc)/
1411 nigel 43 Capturing subpattern count = 0
1412 nigel 41 No options
1413     No first char
1414 nigel 43 No need char
1415 nigel 41
1416     /abc(?!pqr)/
1417 nigel 43 Capturing subpattern count = 0
1418 nigel 41 No options
1419     First char = 'a'
1420 nigel 43 Need char = 'c'
1421 nigel 41
1422     /ab./
1423 nigel 43 Capturing subpattern count = 0
1424 nigel 41 No options
1425     First char = 'a'
1426 nigel 43 Need char = 'b'
1427 nigel 41
1428     /ab[xyz]/
1429 nigel 43 Capturing subpattern count = 0
1430 nigel 41 No options
1431     First char = 'a'
1432 nigel 43 Need char = 'b'
1433 nigel 41
1434     /abc*/
1435 nigel 43 Capturing subpattern count = 0
1436 nigel 41 No options
1437     First char = 'a'
1438 nigel 43 Need char = 'b'
1439 nigel 41
1440     /ab.c*/
1441 nigel 43 Capturing subpattern count = 0
1442 nigel 41 No options
1443     First char = 'a'
1444 nigel 43 Need char = 'b'
1445 nigel 41
1446     /a.c*/
1447 nigel 43 Capturing subpattern count = 0
1448 nigel 41 No options
1449     First char = 'a'
1450 nigel 43 No need char
1451 nigel 41
1452     /.c*/
1453 nigel 43 Capturing subpattern count = 0
1454 nigel 41 No options
1455     No first char
1456 nigel 43 No need char
1457 nigel 41
1458     /ac*/
1459 nigel 43 Capturing subpattern count = 0
1460 nigel 41 No options
1461     First char = 'a'
1462 nigel 43 No need char
1463 nigel 41
1464     /(a.c*|b.c*)/
1465 nigel 43 Capturing subpattern count = 1
1466 nigel 41 No options
1467     No first char
1468 nigel 43 No need char
1469 nigel 41
1470     /a.c*|aba/
1471 nigel 43 Capturing subpattern count = 0
1472 nigel 41 No options
1473     First char = 'a'
1474 nigel 43 No need char
1475 nigel 41
1476     /.+a/
1477 nigel 43 Capturing subpattern count = 0
1478 nigel 41 No options
1479     No first char
1480 nigel 43 Need char = 'a'
1481 nigel 41
1482     /(?=abcda)a.*/
1483 nigel 43 Capturing subpattern count = 0
1484 nigel 41 No options
1485     First char = 'a'
1486 nigel 63 Need char = 'a'
1487 nigel 41
1488     /(?=a)a.*/
1489 nigel 43 Capturing subpattern count = 0
1490 nigel 41 No options
1491     First char = 'a'
1492 nigel 43 No need char
1493 nigel 41
1494     /a(b)*/
1495 nigel 43 Capturing subpattern count = 1
1496 nigel 41 No options
1497     First char = 'a'
1498 nigel 43 No need char
1499 nigel 41
1500     /a\d*/
1501 nigel 43 Capturing subpattern count = 0
1502 nigel 41 No options
1503     First char = 'a'
1504 nigel 43 No need char
1505 nigel 41
1506     /ab\d*/
1507 nigel 43 Capturing subpattern count = 0
1508 nigel 41 No options
1509     First char = 'a'
1510 nigel 43 Need char = 'b'
1511 nigel 41
1512     /a(\d)*/
1513 nigel 43 Capturing subpattern count = 1
1514 nigel 41 No options
1515     First char = 'a'
1516 nigel 43 No need char
1517 nigel 41
1518     /abcde{0,0}/
1519 nigel 43 Capturing subpattern count = 0
1520 nigel 41 No options
1521     First char = 'a'
1522 nigel 43 Need char = 'd'
1523 nigel 41
1524     /ab\d+/
1525 nigel 43 Capturing subpattern count = 0
1526 nigel 41 No options
1527     First char = 'a'
1528 nigel 43 Need char = 'b'
1529 nigel 41
1530     /a(?(1)b)/
1531 nigel 43 Capturing subpattern count = 0
1532 nigel 41 No options
1533     First char = 'a'
1534 nigel 43 No need char
1535 nigel 41
1536     /a(?(1)bag|big)/
1537 nigel 43 Capturing subpattern count = 0
1538 nigel 41 No options
1539     First char = 'a'
1540 nigel 43 Need char = 'g'
1541 nigel 41
1542     /a(?(1)bag|big)*/
1543 nigel 43 Capturing subpattern count = 0
1544 nigel 41 No options
1545     First char = 'a'
1546 nigel 43 No need char
1547 nigel 41
1548     /a(?(1)bag|big)+/
1549 nigel 43 Capturing subpattern count = 0
1550 nigel 41 No options
1551     First char = 'a'
1552 nigel 43 Need char = 'g'
1553 nigel 41
1554     /a(?(1)b..|b..)/
1555 nigel 43 Capturing subpattern count = 0
1556 nigel 41 No options
1557     First char = 'a'
1558 nigel 43 Need char = 'b'
1559 nigel 41
1560     /ab\d{0}e/
1561 nigel 43 Capturing subpattern count = 0
1562 nigel 41 No options
1563     First char = 'a'
1564 nigel 43 Need char = 'e'
1565 nigel 41
1566     /a?b?/
1567 nigel 43 Capturing subpattern count = 0
1568 nigel 41 No options
1569     No first char
1570 nigel 43 No need char
1571 nigel 41 a
1572     0: a
1573     b
1574     0: b
1575     ab
1576     0: ab
1577     \
1578     0:
1579     *** Failers
1580     0:
1581     \N
1582     No match
1583    
1584     /|-/
1585 nigel 43 Capturing subpattern count = 0
1586 nigel 41 No options
1587     No first char
1588 nigel 43 No need char
1589 nigel 41 abcd
1590     0:
1591     -abc
1592     0:
1593     \Nab-c
1594     0: -
1595     *** Failers
1596     0:
1597     \Nabc
1598     No match
1599    
1600     /a*(b+)(z)(z)/P
1601     aaaabbbbzzzz
1602     0: aaaabbbbzz
1603     1: bbbb
1604     2: z
1605     3: z
1606     aaaabbbbzzzz\O0
1607     aaaabbbbzzzz\O1
1608     0: aaaabbbbzz
1609     aaaabbbbzzzz\O2
1610     0: aaaabbbbzz
1611     1: bbbb
1612     aaaabbbbzzzz\O3
1613     0: aaaabbbbzz
1614     1: bbbb
1615     2: z
1616     aaaabbbbzzzz\O4
1617     0: aaaabbbbzz
1618     1: bbbb
1619     2: z
1620     3: z
1621     aaaabbbbzzzz\O5
1622     0: aaaabbbbzz
1623     1: bbbb
1624     2: z
1625     3: z
1626 nigel 43
1627     /^.?abcd/S
1628     Capturing subpattern count = 0
1629     Options: anchored
1630     No first char
1631     Need char = 'd'
1632     Study returned NULL
1633 nigel 41
1634 nigel 43 /\( # ( at start
1635     (?: # Non-capturing bracket
1636     (?>[^()]+) # Either a sequence of non-brackets (no backtracking)
1637     | # Or
1638     (?R) # Recurse - i.e. nested bracketed string
1639     )* # Zero or more contents
1640     \) # Closing )
1641     /x
1642     Capturing subpattern count = 0
1643     Options: extended
1644     First char = '('
1645     Need char = ')'
1646     (abcd)
1647     0: (abcd)
1648     (abcd)xyz
1649     0: (abcd)
1650     xyz(abcd)
1651     0: (abcd)
1652     (ab(xy)cd)pqr
1653     0: (ab(xy)cd)
1654     (ab(xycd)pqr
1655     0: (xycd)
1656     () abc ()
1657     0: ()
1658     12(abcde(fsh)xyz(foo(bar))lmno)89
1659     0: (abcde(fsh)xyz(foo(bar))lmno)
1660     *** Failers
1661     No match
1662     abcd
1663     No match
1664     abcd)
1665     No match
1666     (abcd
1667     No match
1668    
1669     /\( ( (?>[^()]+) | (?R) )* \) /xg
1670     Capturing subpattern count = 1
1671     Options: extended
1672     First char = '('
1673     Need char = ')'
1674     (ab(xy)cd)pqr
1675     0: (ab(xy)cd)
1676     1: cd
1677     1(abcd)(x(y)z)pqr
1678     0: (abcd)
1679     1: abcd
1680     0: (x(y)z)
1681     1: z
1682    
1683     /\( (?: (?>[^()]+) | (?R) ) \) /x
1684     Capturing subpattern count = 0
1685     Options: extended
1686     First char = '('
1687     Need char = ')'
1688     (abcd)
1689     0: (abcd)
1690     (ab(xy)cd)
1691     0: (xy)
1692     (a(b(c)d)e)
1693     0: (c)
1694     ((ab))
1695     0: ((ab))
1696     *** Failers
1697     No match
1698     ()
1699     No match
1700    
1701     /\( (?: (?>[^()]+) | (?R) )? \) /x
1702     Capturing subpattern count = 0
1703     Options: extended
1704     First char = '('
1705     Need char = ')'
1706     ()
1707     0: ()
1708     12(abcde(fsh)xyz(foo(bar))lmno)89
1709     0: (fsh)
1710    
1711     /\( ( (?>[^()]+) | (?R) )* \) /x
1712     Capturing subpattern count = 1
1713     Options: extended
1714     First char = '('
1715     Need char = ')'
1716     (ab(xy)cd)
1717     0: (ab(xy)cd)
1718     1: cd
1719    
1720     /\( ( ( (?>[^()]+) | (?R) )* ) \) /x
1721     Capturing subpattern count = 2
1722     Options: extended
1723     First char = '('
1724     Need char = ')'
1725     (ab(xy)cd)
1726     0: (ab(xy)cd)
1727     1: ab(xy)cd
1728     2: cd
1729    
1730     /\( (123)? ( ( (?>[^()]+) | (?R) )* ) \) /x
1731     Capturing subpattern count = 3
1732     Options: extended
1733     First char = '('
1734     Need char = ')'
1735     (ab(xy)cd)
1736     0: (ab(xy)cd)
1737     1: <unset>
1738     2: ab(xy)cd
1739     3: cd
1740     (123ab(xy)cd)
1741     0: (123ab(xy)cd)
1742     1: 123
1743     2: ab(xy)cd
1744     3: cd
1745    
1746     /\( ( (123)? ( (?>[^()]+) | (?R) )* ) \) /x
1747     Capturing subpattern count = 3
1748     Options: extended
1749     First char = '('
1750     Need char = ')'
1751     (ab(xy)cd)
1752     0: (ab(xy)cd)
1753     1: ab(xy)cd
1754     2: <unset>
1755     3: cd
1756     (123ab(xy)cd)
1757     0: (123ab(xy)cd)
1758     1: 123ab(xy)cd
1759     2: 123
1760     3: cd
1761    
1762     /\( (((((((((( ( (?>[^()]+) | (?R) )* )))))))))) \) /x
1763     Capturing subpattern count = 11
1764     Options: extended
1765     First char = '('
1766     Need char = ')'
1767     (ab(xy)cd)
1768     0: (ab(xy)cd)
1769     1: ab(xy)cd
1770     2: ab(xy)cd
1771     3: ab(xy)cd
1772     4: ab(xy)cd
1773     5: ab(xy)cd
1774     6: ab(xy)cd
1775     7: ab(xy)cd
1776     8: ab(xy)cd
1777     9: ab(xy)cd
1778     10: ab(xy)cd
1779     11: cd
1780    
1781     /\( ( ( (?>[^()<>]+) | ((?>[^()]+)) | (?R) )* ) \) /x
1782     Capturing subpattern count = 3
1783     Options: extended
1784     First char = '('
1785     Need char = ')'
1786     (abcd(xyz<p>qrs)123)
1787     0: (abcd(xyz<p>qrs)123)
1788     1: abcd(xyz<p>qrs)123
1789     2: 123
1790 nigel 63 3: <unset>
1791 nigel 43
1792     /\( ( ( (?>[^()]+) | ((?R)) )* ) \) /x
1793     Capturing subpattern count = 3
1794     Options: extended
1795     First char = '('
1796     Need char = ')'
1797     (ab(cd)ef)
1798     0: (ab(cd)ef)
1799     1: ab(cd)ef
1800     2: ef
1801     3: (cd)
1802     (ab(cd(ef)gh)ij)
1803     0: (ab(cd(ef)gh)ij)
1804     1: ab(cd(ef)gh)ij
1805     2: ij
1806     3: (cd(ef)gh)
1807    
1808     /^[[:alnum:]]/D
1809     ------------------------------------------------------------------
1810     0 37 Bra 0
1811     3 ^
1812     4 [0-9A-Za-z]
1813     37 37 Ket
1814     40 End
1815     ------------------------------------------------------------------
1816     Capturing subpattern count = 0
1817     Options: anchored
1818     No first char
1819     No need char
1820    
1821     /^[[:alpha:]]/D
1822     ------------------------------------------------------------------
1823     0 37 Bra 0
1824     3 ^
1825     4 [A-Za-z]
1826     37 37 Ket
1827     40 End
1828     ------------------------------------------------------------------
1829     Capturing subpattern count = 0
1830     Options: anchored
1831     No first char
1832     No need char
1833    
1834     /^[[:ascii:]]/D
1835     ------------------------------------------------------------------
1836     0 37 Bra 0
1837     3 ^
1838     4 [\x00-\x7f]
1839     37 37 Ket
1840     40 End
1841     ------------------------------------------------------------------
1842     Capturing subpattern count = 0
1843     Options: anchored
1844     No first char
1845     No need char
1846    
1847 nigel 63 /^[[:blank:]]/D
1848     ------------------------------------------------------------------
1849     0 37 Bra 0
1850     3 ^
1851     4 [\x09 ]
1852     37 37 Ket
1853     40 End
1854     ------------------------------------------------------------------
1855     Capturing subpattern count = 0
1856     Options: anchored
1857     No first char
1858     No need char
1859    
1860 nigel 43 /^[[:cntrl:]]/D
1861     ------------------------------------------------------------------
1862     0 37 Bra 0
1863     3 ^
1864     4 [\x00-\x1f\x7f]
1865     37 37 Ket
1866     40 End
1867     ------------------------------------------------------------------
1868     Capturing subpattern count = 0
1869     Options: anchored
1870     No first char
1871     No need char
1872    
1873     /^[[:digit:]]/D
1874     ------------------------------------------------------------------
1875     0 37 Bra 0
1876     3 ^
1877     4 [0-9]
1878     37 37 Ket
1879     40 End
1880     ------------------------------------------------------------------
1881     Capturing subpattern count = 0
1882     Options: anchored
1883     No first char
1884     No need char
1885    
1886     /^[[:graph:]]/D
1887     ------------------------------------------------------------------
1888     0 37 Bra 0
1889     3 ^
1890     4 [!-~]
1891     37 37 Ket
1892     40 End
1893     ------------------------------------------------------------------
1894     Capturing subpattern count = 0
1895     Options: anchored
1896     No first char
1897     No need char
1898    
1899     /^[[:lower:]]/D
1900     ------------------------------------------------------------------
1901     0 37 Bra 0
1902     3 ^
1903     4 [a-z]
1904     37 37 Ket
1905     40 End
1906     ------------------------------------------------------------------
1907     Capturing subpattern count = 0
1908     Options: anchored
1909     No first char
1910     No need char
1911    
1912     /^[[:print:]]/D
1913     ------------------------------------------------------------------
1914     0 37 Bra 0
1915     3 ^
1916     4 [ -~]
1917     37 37 Ket
1918     40 End
1919     ------------------------------------------------------------------
1920     Capturing subpattern count = 0
1921     Options: anchored
1922     No first char
1923     No need char
1924    
1925     /^[[:punct:]]/D
1926     ------------------------------------------------------------------
1927     0 37 Bra 0
1928     3 ^
1929     4 [!-/:-@[-`{-~]
1930     37 37 Ket
1931     40 End
1932     ------------------------------------------------------------------
1933     Capturing subpattern count = 0
1934     Options: anchored
1935     No first char
1936     No need char
1937    
1938     /^[[:space:]]/D
1939     ------------------------------------------------------------------
1940     0 37 Bra 0
1941     3 ^
1942     4 [\x09-\x0d ]
1943     37 37 Ket
1944     40 End
1945     ------------------------------------------------------------------
1946     Capturing subpattern count = 0
1947     Options: anchored
1948     No first char
1949     No need char
1950    
1951     /^[[:upper:]]/D
1952     ------------------------------------------------------------------
1953     0 37 Bra 0
1954     3 ^
1955     4 [A-Z]
1956     37 37 Ket
1957     40 End
1958     ------------------------------------------------------------------
1959     Capturing subpattern count = 0
1960     Options: anchored
1961     No first char
1962     No need char
1963    
1964     /^[[:xdigit:]]/D
1965     ------------------------------------------------------------------
1966     0 37 Bra 0
1967     3 ^
1968     4 [0-9A-Fa-f]
1969     37 37 Ket
1970     40 End
1971     ------------------------------------------------------------------
1972     Capturing subpattern count = 0
1973     Options: anchored
1974     No first char
1975     No need char
1976    
1977     /^[[:word:]]/D
1978     ------------------------------------------------------------------
1979     0 37 Bra 0
1980     3 ^
1981     4 [0-9A-Z_a-z]
1982     37 37 Ket
1983     40 End
1984     ------------------------------------------------------------------
1985     Capturing subpattern count = 0
1986     Options: anchored
1987     No first char
1988     No need char
1989    
1990     /^[[:^cntrl:]]/D
1991     ------------------------------------------------------------------
1992     0 37 Bra 0
1993     3 ^
1994     4 [ -~\x80-\xff]
1995     37 37 Ket
1996     40 End
1997     ------------------------------------------------------------------
1998     Capturing subpattern count = 0
1999     Options: anchored
2000     No first char
2001     No need char
2002    
2003     /^[12[:^digit:]]/D
2004     ------------------------------------------------------------------
2005     0 37 Bra 0
2006     3 ^
2007     4 [\x00-/1-2:-\xff]
2008     37 37 Ket
2009     40 End
2010     ------------------------------------------------------------------
2011     Capturing subpattern count = 0
2012     Options: anchored
2013     No first char
2014     No need char
2015    
2016 nigel 63 /^[[:^blank:]]/D
2017     ------------------------------------------------------------------
2018     0 37 Bra 0
2019     3 ^
2020     4 [\x00-\x08\x0a-\x1f!-\xff]
2021     37 37 Ket
2022     40 End
2023     ------------------------------------------------------------------
2024     Capturing subpattern count = 0
2025     Options: anchored
2026     No first char
2027     No need char
2028    
2029 nigel 43 /[01[:alpha:]%]/D
2030     ------------------------------------------------------------------
2031     0 36 Bra 0
2032     3 [%0-1A-Za-z]
2033     36 36 Ket
2034     39 End
2035     ------------------------------------------------------------------
2036     Capturing subpattern count = 0
2037     No options
2038     No first char
2039     No need char
2040    
2041     /[[.ch.]]/
2042     Failed: POSIX collating elements are not supported at offset 1
2043    
2044     /[[=ch=]]/
2045     Failed: POSIX collating elements are not supported at offset 1
2046    
2047     /[[:rhubarb:]]/
2048     Failed: unknown POSIX class name at offset 3
2049    
2050     /[[:upper:]]/i
2051     Capturing subpattern count = 0
2052     Options: caseless
2053     No first char
2054     No need char
2055     A
2056     0: A
2057     a
2058     0: a
2059    
2060     /[[:lower:]]/i
2061     Capturing subpattern count = 0
2062     Options: caseless
2063     No first char
2064     No need char
2065     A
2066     0: A
2067     a
2068     0: a
2069    
2070     /((?-i)[[:lower:]])[[:lower:]]/i
2071     Capturing subpattern count = 1
2072     Options: caseless
2073     Case state changes
2074     No first char
2075     No need char
2076     ab
2077     0: ab
2078     1: a
2079     aB
2080     0: aB
2081     1: a
2082     *** Failers
2083     0: ai
2084     1: a
2085     Ab
2086     No match
2087     AB
2088     No match
2089    
2090 nigel 49 /[\200-\410]/
2091     Failed: range out of order in character class at offset 9
2092    
2093 nigel 51 /^(?(0)f|b)oo/
2094     Failed: invalid condition (?(0) at offset 5
2095    
2096 nigel 53 /This one's here because of the large output vector needed/
2097     Capturing subpattern count = 0
2098     No options
2099     First char = 'T'
2100     Need char = 'd'
2101    
2102     /(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\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)/
2103     Capturing subpattern count = 271
2104     Max back reference = 270
2105     No options
2106     No first char
2107     No need char
2108     \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
2109     0: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 ABC ABC
2110     1: 1
2111     2: 2
2112     3: 3
2113     4: 4
2114     5: 5
2115     6: 6
2116     7: 7
2117     8: 8
2118     9: 9
2119     10: 10
2120     11: 11
2121     12: 12
2122     13: 13
2123     14: 14
2124     15: 15
2125     16: 16
2126     17: 17
2127     18: 18
2128     19: 19
2129     20: 20
2130     21: 21
2131     22: 22
2132     23: 23
2133     24: 24
2134     25: 25
2135     26: 26
2136     27: 27
2137     28: 28
2138     29: 29
2139     30: 30
2140     31: 31
2141     32: 32
2142     33: 33
2143     34: 34
2144     35: 35
2145     36: 36
2146     37: 37
2147     38: 38
2148     39: 39
2149     40: 40
2150     41: 41
2151     42: 42
2152     43: 43
2153     44: 44
2154     45: 45
2155     46: 46
2156     47: 47
2157     48: 48
2158     49: 49
2159     50: 50
2160     51: 51
2161     52: 52
2162     53: 53
2163     54: 54
2164     55: 55
2165     56: 56
2166     57: 57
2167     58: 58
2168     59: 59
2169     60: 60
2170     61: 61
2171     62: 62
2172     63: 63
2173     64: 64
2174     65: 65
2175     66: 66
2176     67: 67
2177     68: 68
2178     69: 69
2179     70: 70
2180     71: 71
2181     72: 72
2182     73: 73
2183     74: 74
2184     75: 75
2185     76: 76
2186     77: 77
2187     78: 78
2188     79: 79
2189     80: 80
2190     81: 81
2191     82: 82
2192     83: 83
2193     84: 84
2194     85: 85
2195     86: 86
2196     87: 87
2197     88: 88
2198     89: 89
2199     90: 90
2200     91: 91
2201     92: 92
2202     93: 93
2203     94: 94
2204     95: 95
2205     96: 96
2206     97: 97
2207     98: 98
2208     99: 99
2209     100: 100
2210     101: 101
2211     102: 102
2212     103: 103
2213     104: 104
2214     105: 105
2215     106: 106
2216     107: 107
2217     108: 108
2218     109: 109
2219     110: 110
2220     111: 111
2221     112: 112
2222     113: 113
2223     114: 114
2224     115: 115
2225     116: 116
2226     117: 117
2227     118: 118
2228     119: 119
2229     120: 120
2230     121: 121
2231     122: 122
2232     123: 123
2233     124: 124
2234     125: 125
2235     126: 126
2236     127: 127
2237     128: 128
2238     129: 129
2239     130: 130
2240     131: 131
2241     132: 132
2242     133: 133
2243     134: 134
2244     135: 135
2245     136: 136
2246     137: 137
2247     138: 138
2248     139: 139
2249     140: 140
2250     141: 141
2251     142: 142
2252     143: 143
2253     144: 144
2254     145: 145
2255     146: 146
2256     147: 147
2257     148: 148
2258     149: 149
2259     150: 150
2260     151: 151
2261     152: 152
2262     153: 153
2263     154: 154
2264     155: 155
2265     156: 156
2266     157: 157
2267     158: 158
2268     159: 159
2269     160: 160
2270     161: 161
2271     162: 162
2272     163: 163
2273     164: 164
2274     165: 165
2275     166: 166
2276     167: 167
2277     168: 168
2278     169: 169
2279     170: 170
2280     171: 171
2281     172: 172
2282     173: 173
2283     174: 174
2284     175: 175
2285     176: 176
2286     177: 177
2287     178: 178
2288     179: 179
2289     180: 180
2290     181: 181
2291     182: 182
2292     183: 183
2293     184: 184
2294     185: 185
2295     186: 186
2296     187: 187
2297     188: 188
2298     189: 189
2299     190: 190
2300     191: 191
2301     192: 192
2302     193: 193
2303     194: 194
2304     195: 195
2305     196: 196
2306     197: 197
2307     198: 198
2308     199: 199
2309     200: 200
2310     201: 201
2311     202: 202
2312     203: 203
2313     204: 204
2314     205: 205
2315     206: 206
2316     207: 207
2317     208: 208
2318     209: 209
2319     210: 210
2320     211: 211
2321     212: 212
2322     213: 213
2323     214: 214
2324     215: 215
2325     216: 216
2326     217: 217
2327     218: 218
2328     219: 219
2329     220: 220
2330     221: 221
2331     222: 222
2332     223: 223
2333     224: 224
2334     225: 225
2335     226: 226
2336     227: 227
2337     228: 228
2338     229: 229
2339     230: 230
2340     231: 231
2341     232: 232
2342     233: 233
2343     234: 234
2344     235: 235
2345     236: 236
2346     237: 237
2347     238: 238
2348     239: 239
2349     240: 240
2350     241: 241
2351     242: 242
2352     243: 243
2353     244: 244
2354     245: 245
2355     246: 246
2356     247: 247
2357     248: 248
2358     249: 249
2359     250: 250
2360     251: 251
2361     252: 252
2362     253: 253
2363     254: 254
2364     255: 255
2365     256: 256
2366     257: 257
2367     258: 258
2368     259: 259
2369     260: 260
2370     261: 261
2371     262: 262
2372     263: 263
2373     264: 264
2374     265: 265
2375     266: 266
2376     267: 267
2377     268: 268
2378     269: 269
2379     270: ABC
2380     271: ABC
2381    
2382     /This one's here because Perl does this differently and PCRE can't at present/
2383     Capturing subpattern count = 0
2384     No options
2385     First char = 'T'
2386     Need char = 't'
2387    
2388     /(main(O)?)+/
2389     Capturing subpattern count = 2
2390     No options
2391     First char = 'm'
2392     Need char = 'n'
2393     mainmain
2394     0: mainmain
2395     1: main
2396     mainOmain
2397     0: mainOmain
2398     1: main
2399     2: O
2400    
2401 nigel 63 /These are all cases where Perl does it differently (nested captures)/
2402     Capturing subpattern count = 1
2403     No options
2404     First char = 'T'
2405     Need char = 's'
2406    
2407     /^(a(b)?)+$/
2408     Capturing subpattern count = 2
2409     Options: anchored
2410     No first char
2411 nigel 65 No need char
2412 nigel 63 aba
2413     0: aba
2414     1: a
2415     2: b
2416    
2417     /^(aa(bb)?)+$/
2418     Capturing subpattern count = 2
2419     Options: anchored
2420     No first char
2421 nigel 65 No need char
2422 nigel 63 aabbaa
2423     0: aabbaa
2424     1: aa
2425     2: bb
2426    
2427     /^(aa|aa(bb))+$/
2428     Capturing subpattern count = 2
2429     Options: anchored
2430     No first char
2431 nigel 65 No need char
2432 nigel 63 aabbaa
2433     0: aabbaa
2434     1: aa
2435     2: bb
2436    
2437     /^(aa(bb)??)+$/
2438     Capturing subpattern count = 2
2439     Options: anchored
2440     No first char
2441 nigel 65 No need char
2442 nigel 63 aabbaa
2443     0: aabbaa
2444     1: aa
2445     2: bb
2446    
2447     /^(?:aa(bb)?)+$/
2448     Capturing subpattern count = 1
2449     Options: anchored
2450     No first char
2451 nigel 65 No need char
2452 nigel 63 aabbaa
2453     0: aabbaa
2454     1: bb
2455    
2456     /^(aa(b(b))?)+$/
2457     Capturing subpattern count = 3
2458     Options: anchored
2459     No first char
2460 nigel 65 No need char
2461 nigel 63 aabbaa
2462     0: aabbaa
2463     1: aa
2464     2: bb
2465     3: b
2466    
2467     /^(?:aa(b(b))?)+$/
2468     Capturing subpattern count = 2
2469     Options: anchored
2470     No first char
2471 nigel 65 No need char
2472 nigel 63 aabbaa
2473     0: aabbaa
2474     1: bb
2475     2: b
2476    
2477     /^(?:aa(b(?:b))?)+$/
2478     Capturing subpattern count = 1
2479     Options: anchored
2480     No first char
2481 nigel 65 No need char
2482 nigel 63 aabbaa
2483     0: aabbaa
2484     1: bb
2485    
2486     /^(?:aa(bb(?:b))?)+$/
2487     Capturing subpattern count = 1
2488     Options: anchored
2489     No first char
2490 nigel 65 No need char
2491 nigel 63 aabbbaa
2492     0: aabbbaa
2493     1: bbb
2494    
2495     /^(?:aa(b(?:bb))?)+$/
2496     Capturing subpattern count = 1
2497     Options: anchored
2498     No first char
2499 nigel 65 No need char
2500 nigel 63 aabbbaa
2501     0: aabbbaa
2502     1: bbb
2503    
2504     /^(?:aa(?:b(b))?)+$/
2505     Capturing subpattern count = 1
2506     Options: anchored
2507     No first char
2508 nigel 65 No need char
2509 nigel 63 aabbaa
2510     0: aabbaa
2511     1: b
2512    
2513     /^(?:aa(?:b(bb))?)+$/
2514     Capturing subpattern count = 1
2515     Options: anchored
2516     No first char
2517 nigel 65 No need char
2518 nigel 63 aabbbaa
2519     0: aabbbaa
2520     1: bb
2521    
2522     /^(aa(b(bb))?)+$/
2523     Capturing subpattern count = 3
2524     Options: anchored
2525     No first char
2526 nigel 65 No need char
2527 nigel 63 aabbbaa
2528     0: aabbbaa
2529     1: aa
2530     2: bbb
2531     3: bb
2532    
2533     /^(aa(bb(bb))?)+$/
2534     Capturing subpattern count = 3
2535     Options: anchored
2536     No first char
2537 nigel 65 No need char
2538 nigel 63 aabbbbaa
2539     0: aabbbbaa
2540     1: aa
2541     2: bbbb
2542     3: bb
2543    
2544     /--------------------------------------------------------------------/
2545     Capturing subpattern count = 0
2546     No options
2547     First char = '-'
2548     Need char = '-'
2549    
2550     /#/xMD
2551     Memory allocation (code space): 7
2552     ------------------------------------------------------------------
2553     0 3 Bra 0
2554     3 3 Ket
2555     6 End
2556     ------------------------------------------------------------------
2557     Capturing subpattern count = 0
2558     Options: extended
2559     No first char
2560     No need char
2561    
2562     /a#/xMD
2563     Memory allocation (code space): 13
2564     ------------------------------------------------------------------
2565     0 6 Bra 0
2566     3 1 a
2567     6 6 Ket
2568     9 End
2569     ------------------------------------------------------------------
2570     Capturing subpattern count = 0
2571     Options: extended
2572     First char = 'a'
2573     No need char
2574    
2575     /[\s]/D
2576     ------------------------------------------------------------------
2577     0 36 Bra 0
2578     3 [\x09-\x0a\x0c-\x0d ]
2579     36 36 Ket
2580     39 End
2581     ------------------------------------------------------------------
2582     Capturing subpattern count = 0
2583     No options
2584     No first char
2585     No need char
2586    
2587     /[\S]/D
2588     ------------------------------------------------------------------
2589     0 36 Bra 0
2590     3 [\x00-\x08\x0b\x0e-\x1f!-\xff]
2591     36 36 Ket
2592     39 End
2593     ------------------------------------------------------------------
2594     Capturing subpattern count = 0
2595     No options
2596     No first char
2597     No need char
2598    
2599     /a(?i)b/D
2600     ------------------------------------------------------------------
2601     0 11 Bra 0
2602     3 1 a
2603     6 01 Opt
2604     8 1 b
2605     11 11 Ket
2606     14 End
2607     ------------------------------------------------------------------
2608     Capturing subpattern count = 0
2609     No options
2610     Case state changes
2611     First char = 'a'
2612     Need char = 'b' (caseless)
2613     ab
2614     0: ab
2615     aB
2616     0: aB
2617     *** Failers
2618     No match
2619     AB
2620     No match
2621    
2622     /(a(?i)b)/D
2623     ------------------------------------------------------------------
2624     0 19 Bra 0
2625     3 11 Bra 1
2626     6 1 a
2627     9 01 Opt
2628     11 1 b
2629     14 11 Ket
2630     17 00 Opt
2631     19 19 Ket
2632     22 End
2633     ------------------------------------------------------------------
2634     Capturing subpattern count = 1
2635     No options
2636     Case state changes
2637     First char = 'a'
2638     Need char = 'b' (caseless)
2639     ab
2640     0: ab
2641     1: ab
2642     aB
2643     0: aB
2644     1: aB
2645     *** Failers
2646     No match
2647     AB
2648     No match
2649    
2650     / (?i)abc/xD
2651     ------------------------------------------------------------------
2652     0 8 Bra 0
2653     3 3 abc
2654     8 8 Ket
2655     11 End
2656     ------------------------------------------------------------------
2657     Capturing subpattern count = 0
2658     Options: caseless extended
2659     First char = 'a' (caseless)
2660     Need char = 'c' (caseless)
2661    
2662     /#this is a comment
2663     (?i)abc/xD
2664     ------------------------------------------------------------------
2665     0 8 Bra 0
2666     3 3 abc
2667     8 8 Ket
2668     11 End
2669     ------------------------------------------------------------------
2670     Capturing subpattern count = 0
2671     Options: caseless extended
2672     First char = 'a' (caseless)
2673     Need char = 'c' (caseless)
2674    
2675     /123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890/D
2676     ------------------------------------------------------------------
2677     0 307 Bra 0
2678     3 250 1234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890
2679     255 50 12345678901234567890123456789012345678901234567890
2680     307 307 Ket
2681     310 End
2682     ------------------------------------------------------------------
2683     Capturing subpattern count = 0
2684     No options
2685     First char = '1'
2686     Need char = '0'
2687    
2688     /\Q123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890/D
2689     ------------------------------------------------------------------
2690     0 307 Bra 0
2691     3 250 1234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890
2692     255 50 12345678901234567890123456789012345678901234567890
2693     307 307 Ket
2694     310 End
2695     ------------------------------------------------------------------
2696     Capturing subpattern count = 0
2697     No options
2698     First char = '1'
2699     Need char = '0'
2700    
2701     /\Q\E/D
2702     ------------------------------------------------------------------
2703     0 3 Bra 0
2704     3 3 Ket
2705     6 End
2706     ------------------------------------------------------------------
2707     Capturing subpattern count = 0
2708     No options
2709     No first char
2710     No need char
2711     \
2712     0:
2713    
2714     /\Q\Ex/D
2715     ------------------------------------------------------------------
2716     0 6 Bra 0
2717     3 1 x
2718     6 6 Ket
2719     9 End
2720     ------------------------------------------------------------------
2721     Capturing subpattern count = 0
2722     No options
2723     First char = 'x'
2724     No need char
2725    
2726     / \Q\E/D
2727     ------------------------------------------------------------------
2728     0 6 Bra 0
2729     3 1
2730     6 6 Ket
2731     9 End
2732     ------------------------------------------------------------------
2733     Capturing subpattern count = 0
2734     No options
2735     First char = ' '
2736     No need char
2737    
2738     /a\Q\E/D
2739     ------------------------------------------------------------------
2740     0 6 Bra 0
2741     3 1 a
2742     6 6 Ket
2743     9 End
2744     ------------------------------------------------------------------
2745     Capturing subpattern count = 0
2746     No options
2747     First char = 'a'
2748     No need char
2749     abc
2750     0: a
2751     bca
2752     0: a
2753     bac
2754     0: a
2755    
2756     /a\Q\Eb/D
2757     ------------------------------------------------------------------
2758     0 9 Bra 0
2759     3 1 a
2760     6 1 b
2761     9 9 Ket
2762     12 End
2763     ------------------------------------------------------------------
2764     Capturing subpattern count = 0
2765     No options
2766     First char = 'a'
2767     Need char = 'b'
2768     abc
2769     0: ab
2770    
2771     /\Q\Eabc/D
2772     ------------------------------------------------------------------
2773     0 8 Bra 0
2774     3 3 abc
2775     8 8 Ket
2776     11 End
2777     ------------------------------------------------------------------
2778     Capturing subpattern count = 0
2779     No options
2780     First char = 'a'
2781     Need char = 'c'
2782    
2783     /x*+\w/D
2784     ------------------------------------------------------------------
2785     0 12 Bra 0
2786     3 5 Once
2787     6 x*
2788     8 5 Ket
2789     11 \w
2790     12 12 Ket
2791     15 End
2792     ------------------------------------------------------------------
2793     Capturing subpattern count = 0
2794     No options
2795     No first char
2796     No need char
2797     *** Failers
2798     0: F
2799     xxxxx
2800     No match
2801    
2802     /x?+/D
2803     ------------------------------------------------------------------
2804     0 11 Bra 0
2805     3 5 Once
2806     6 x?
2807     8 5 Ket
2808     11 11 Ket
2809     14 End
2810     ------------------------------------------------------------------
2811     Capturing subpattern count = 0
2812     No options
2813     No first char
2814     No need char
2815    
2816     /x++/D
2817     ------------------------------------------------------------------
2818     0 11 Bra 0
2819     3 5 Once
2820     6 x+
2821     8 5 Ket
2822     11 11 Ket
2823     14 End
2824     ------------------------------------------------------------------
2825     Capturing subpattern count = 0
2826     No options
2827     First char = 'x'
2828     No need char
2829    
2830     /x{1,3}+/D
2831     ------------------------------------------------------------------
2832     0 16 Bra 0
2833     3 10 Once
2834     6 1 x
2835     9 x{,2}
2836     13 10 Ket
2837     16 16 Ket
2838     19 End
2839     ------------------------------------------------------------------
2840     Capturing subpattern count = 0
2841     No options
2842     First char = 'x'
2843     No need char
2844    
2845     /(x)*+/D
2846     ------------------------------------------------------------------
2847     0 19 Bra 0
2848     3 13 Once
2849     6 Brazero
2850     7 6 Bra 1
2851     10 1 x
2852     13 6 KetRmax
2853     16 13 Ket
2854     19 19 Ket
2855     22 End
2856     ------------------------------------------------------------------
2857     Capturing subpattern count = 1
2858     No options
2859     No first char
2860     No need char
2861    
2862     /^(\w++|\s++)*$/
2863     Capturing subpattern count = 1
2864     Options: anchored
2865     No first char
2866     No need char
2867     now is the time for all good men to come to the aid of the party
2868     0: now is the time for all good men to come to the aid of the party
2869     1: party
2870     *** Failers
2871     No match
2872     this is not a line with only words and spaces!
2873     No match
2874    
2875     /(\d++)(\w)/
2876     Capturing subpattern count = 2
2877     No options
2878     No first char
2879     No need char
2880     12345a
2881     0: 12345a
2882     1: 12345
2883     2: a
2884     *** Failers
2885     No match
2886     12345+
2887     No match
2888    
2889     /a++b/
2890     Capturing subpattern count = 0
2891     No options
2892     First char = 'a'
2893     Need char = 'b'
2894     aaab
2895     0: aaab
2896    
2897     /(a++b)/
2898     Capturing subpattern count = 1
2899     No options
2900     First char = 'a'
2901     Need char = 'b'
2902     aaab
2903     0: aaab
2904     1: aaab
2905    
2906     /(a++)b/
2907     Capturing subpattern count = 1
2908     No options
2909     First char = 'a'
2910     Need char = 'b'
2911     aaab
2912     0: aaab
2913     1: aaa
2914    
2915     /([^()]++|\([^()]*\))+/
2916     Capturing subpattern count = 1
2917     No options
2918     No first char
2919     No need char
2920     ((abc(ade)ufh()()x
2921     0: abc(ade)ufh()()x
2922     1: x
2923    
2924     /\(([^()]++|\([^()]+\))+\)/
2925     Capturing subpattern count = 1
2926     No options
2927     First char = '('
2928     Need char = ')'
2929     (abc)
2930     0: (abc)
2931     1: abc
2932     (abc(def)xyz)
2933     0: (abc(def)xyz)
2934     1: xyz
2935     *** Failers
2936     No match
2937     ((()aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
2938     No match
2939    
2940     /(abc){1,3}+/D
2941     ------------------------------------------------------------------
2942     0 50 Bra 0
2943     3 44 Once
2944     6 8 Bra 1
2945     9 3 abc
2946     14 8 Ket
2947     17 Brazero
2948     18 26 Bra 0
2949     21 8 Bra 1
2950     24 3 abc
2951     29 8 Ket
2952     32 Brazero
2953     33 8 Bra 1
2954     36 3 abc
2955     41 8 Ket
2956     44 26 Ket
2957     47 44 Ket
2958     50 50 Ket
2959     53 End
2960     ------------------------------------------------------------------
2961     Capturing subpattern count = 1
2962     No options
2963     First char = 'a'
2964     Need char = 'c'
2965    
2966     /a+?+/
2967     Failed: nothing to repeat at offset 3
2968    
2969     /a{2,3}?+b/
2970     Failed: nothing to repeat at offset 7
2971    
2972     /(?U)a+?+/
2973     Failed: nothing to repeat at offset 7
2974    
2975     /a{2,3}?+b/U
2976     Failed: nothing to repeat at offset 7
2977    
2978     /x(?U)a++b/D
2979     ------------------------------------------------------------------
2980     0 17 Bra 0
2981     3 1 x
2982     6 5 Once
2983     9 a+
2984     11 5 Ket
2985     14 1 b
2986     17 17 Ket
2987     20 End
2988     ------------------------------------------------------------------
2989     Capturing subpattern count = 0
2990     No options
2991     First char = 'x'
2992     Need char = 'b'
2993     xaaaab
2994     0: xaaaab
2995    
2996     /(?U)xa++b/D
2997     ------------------------------------------------------------------
2998     0 17 Bra 0
2999     3 1 x
3000     6 5 Once
3001     9 a+
3002     11 5 Ket
3003     14 1 b
3004     17 17 Ket
3005     20 End
3006     ------------------------------------------------------------------
3007     Capturing subpattern count = 0
3008     Options: ungreedy
3009     First char = 'x'
3010     Need char = 'b'
3011     xaaaab
3012     0: xaaaab
3013    
3014     /^((a+)(?U)([ab]+)(?-U)([bc]+)(\w*))/D
3015     ------------------------------------------------------------------
3016     0 106 Bra 0
3017     3 ^
3018     4 99 Bra 1
3019     7 5 Bra 2
3020     10 a+
3021     12 5 Ket
3022     15 37 Bra 3
3023     18 [a-b]+?
3024     52 37 Ket
3025     55 37 Bra 4
3026     58 [b-c]+
3027     92 37 Ket
3028     95 5 Bra 5
3029     98 \w*
3030     100 5 Ket
3031     103 99 Ket
3032     106 106 Ket
3033     109 End
3034     ------------------------------------------------------------------
3035     Capturing subpattern count = 5
3036     Options: anchored
3037     No first char
3038 nigel 65 No need char
3039 nigel 63
3040     /^x(?U)a+b/D
3041     ------------------------------------------------------------------
3042     0 12 Bra 0
3043     3 ^
3044     4 1 x
3045     7 a+?
3046     9 1 b
3047     12 12 Ket
3048     15 End
3049     ------------------------------------------------------------------
3050     Capturing subpattern count = 0
3051     Options: anchored
3052     No first char
3053     Need char = 'b'
3054    
3055     /^x(?U)(a+)b/D
3056     ------------------------------------------------------------------
3057     0 18 Bra 0
3058     3 ^
3059     4 1 x
3060     7 5 Bra 1
3061     10 a+?
3062     12 5 Ket
3063     15 1 b
3064     18 18 Ket
3065     21 End
3066     ------------------------------------------------------------------
3067     Capturing subpattern count = 1
3068     Options: anchored
3069     No first char
3070     Need char = 'b'
3071    
3072     /[.x.]/
3073     Failed: POSIX collating elements are not supported at offset 0
3074    
3075     /[=x=]/
3076     Failed: POSIX collating elements are not supported at offset 0
3077    
3078     /[:x:]/
3079     Failed: POSIX named classes are supported only within a class at offset 0
3080    
3081     /\l/
3082     Failed: PCRE does not support \L, \l, \N, \P, \p, \U, \u, or \X at offset 1
3083    
3084     /\L/
3085     Failed: PCRE does not support \L, \l, \N, \P, \p, \U, \u, or \X at offset 1
3086    
3087     /\N{name}/
3088     Failed: PCRE does not support \L, \l, \N, \P, \p, \U, \u, or \X at offset 1
3089    
3090     /\pP/
3091     Failed: PCRE does not support \L, \l, \N, \P, \p, \U, \u, or \X at offset 1
3092    
3093     /\PP/
3094     Failed: PCRE does not support \L, \l, \N, \P, \p, \U, \u, or \X at offset 1
3095    
3096     /\p{prop}/
3097     Failed: PCRE does not support \L, \l, \N, \P, \p, \U, \u, or \X at offset 1
3098    
3099     /\P{prop}/
3100     Failed: PCRE does not support \L, \l, \N, \P, \p, \U, \u, or \X at offset 1
3101    
3102     /\u/
3103     Failed: PCRE does not support \L, \l, \N, \P, \p, \U, \u, or \X at offset 1
3104    
3105     /\U/
3106     Failed: PCRE does not support \L, \l, \N, \P, \p, \U, \u, or \X at offset 1
3107    
3108     /\X/
3109     Failed: PCRE does not support \L, \l, \N, \P, \p, \U, \u, or \X at offset 1
3110    
3111     /[/
3112     Failed: missing terminating ] for character class at offset 1
3113    
3114     /[a-/
3115     Failed: missing terminating ] for character class at offset 3
3116    
3117     /[[:space:]/
3118     Failed: missing terminating ] for character class at offset 10
3119    
3120     /[\s]/DM
3121     Memory allocation (code space): 40
3122     ------------------------------------------------------------------
3123     0 36 Bra 0
3124     3 [\x09-\x0a\x0c-\x0d ]
3125     36 36 Ket
3126     39 End
3127     ------------------------------------------------------------------
3128     Capturing subpattern count = 0
3129     No options
3130     No first char
3131     No need char
3132    
3133     /[[:space:]]/DM
3134     Memory allocation (code space): 40
3135     ------------------------------------------------------------------
3136     0 36 Bra 0
3137     3 [\x09-\x0d ]
3138     36 36 Ket
3139     39 End
3140     ------------------------------------------------------------------
3141     Capturing subpattern count = 0
3142     No options
3143     No first char
3144     No need char
3145    
3146     /[[:space:]abcde]/DM
3147     Memory allocation (code space): 40
3148     ------------------------------------------------------------------
3149     0 36 Bra 0
3150     3 [\x09-\x0d a-e]
3151     36 36 Ket
3152     39 End
3153     ------------------------------------------------------------------
3154     Capturing subpattern count = 0
3155     No options
3156     No first char
3157     No need char
3158    
3159     /< (?: (?(R) \d++ | [^<>]*+) | (?R)) * >/x
3160     Capturing subpattern count = 0
3161     Options: extended
3162     First char = '<'
3163     Need char = '>'
3164     <>
3165     0: <>
3166     <abcd>
3167     0: <abcd>
3168     <abc <123> hij>
3169     0: <abc <123> hij>
3170     <abc <def> hij>
3171     0: <def>
3172     <abc<>def>
3173     0: <abc<>def>
3174     <abc<>
3175     0: <>
3176     *** Failers
3177     No match
3178     <abc
3179     No match
3180    
3181     |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|DM
3182     Memory allocation (code space): 421
3183     ------------------------------------------------------------------
3184     0 417 Bra 0
3185     3 250 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:
3186     255 159 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
3187     416 \b
3188     417 417 Ket
3189     420 End
3190     ------------------------------------------------------------------
3191     Capturing subpattern count = 0
3192     No options
3193     First char = '8'
3194     Need char = 'X'
3195    
3196     |\$\<\.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|DM
3197     Memory allocation (code space): 416
3198     ------------------------------------------------------------------
3199     0 412 Bra 0
3200     3 250 $<.X+ix[d1b!H#?vV0vrK:ZH1=2M>iV;?aPhFB<*vW@QW@sO9}cfZA-i'w%hKd6gt1UJP,15_#QY$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[
3201     255 154 %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
3202     411 \b
3203     412 412 Ket
3204     415 End
3205     ------------------------------------------------------------------
3206     Capturing subpattern count = 0
3207     No options
3208     First char = '$'
3209     Need char = 'X'
3210    
3211     /(.*)\d+\1/I
3212     Capturing subpattern count = 1
3213     Max back reference = 1
3214     No options
3215     No first char
3216     No need char
3217    
3218     /(.*)\d+/I
3219     Capturing subpattern count = 1
3220     No options
3221     First char at start or follows \n
3222     No need char
3223    
3224     /(.*)\d+\1/Is
3225     Capturing subpattern count = 1
3226     Max back reference = 1
3227     Options: dotall
3228     No first char
3229     No need char
3230    
3231     /(.*)\d+/Is
3232     Capturing subpattern count = 1
3233     Options: anchored dotall
3234     No first char
3235     No need char
3236    
3237     /(.*(xyz))\d+\2/I
3238     Capturing subpattern count = 2
3239     Max back reference = 2
3240     No options
3241     First char at start or follows \n
3242     Need char = 'z'
3243    
3244     /((.*))\d+\1/I
3245     Capturing subpattern count = 2
3246     Max back reference = 1
3247     No options
3248     No first char
3249     No need char
3250     abc123bc
3251     0: bc123bc
3252     1: bc
3253     2: bc
3254    
3255     /a[b]/I
3256     Capturing subpattern count = 0
3257     No options
3258     First char = 'a'
3259     Need char = 'b'
3260    
3261     /(?=a).*/I
3262     Capturing subpattern count = 0
3263     No options
3264     First char = 'a'
3265     No need char
3266    
3267     /(?=abc).xyz/iI
3268     Capturing subpattern count = 0
3269     Options: caseless
3270     First char = 'a' (caseless)
3271     Need char = 'z' (caseless)
3272    
3273     /(?=abc)(?i).xyz/I
3274     Capturing subpattern count = 0
3275     No options
3276     Case state changes
3277     First char = 'a'
3278     Need char = 'z' (caseless)
3279    
3280     /(?=a)(?=b)/I
3281     Capturing subpattern count = 0
3282     No options
3283     First char = 'a'
3284     No need char
3285    
3286     /(?=.)a/I
3287     Capturing subpattern count = 0
3288     No options
3289     First char = 'a'
3290     No need char
3291    
3292     /((?=abcda)a)/I
3293     Capturing subpattern count = 1
3294     No options
3295     First char = 'a'
3296     Need char = 'a'
3297    
3298     /((?=abcda)ab)/I
3299     Capturing subpattern count = 1
3300     No options
3301     First char = 'a'
3302     Need char = 'b'
3303    
3304     /()a/I
3305     Capturing subpattern count = 1
3306     No options
3307     No first char
3308     Need char = 'a'
3309    
3310     /(?(1)ab|ac)/I
3311     Capturing subpattern count = 0
3312     No options
3313     First char = 'a'
3314     No need char
3315    
3316     /(?(1)abz|acz)/I
3317     Capturing subpattern count = 0
3318     No options
3319     First char = 'a'
3320     Need char = 'z'
3321    
3322     /(?(1)abz)/I
3323     Capturing subpattern count = 0
3324     No options
3325     No first char
3326     No need char
3327    
3328     /(?(1)abz)123/I
3329     Capturing subpattern count = 0
3330     No options
3331     No first char
3332     Need char = '3'
3333    
3334     /(a)+/I
3335     Capturing subpattern count = 1
3336     No options
3337     First char = 'a'
3338     No need char
3339    
3340     /(a){2,3}/I
3341     Capturing subpattern count = 1
3342     No options
3343     First char = 'a'
3344     Need char = 'a'
3345    
3346     /(a)*/I
3347     Capturing subpattern count = 1
3348     No options
3349     No first char
3350     No need char
3351    
3352     /[a]/I
3353     Capturing subpattern count = 0
3354     No options
3355     First char = 'a'
3356     No need char
3357    
3358     /[ab]/I
3359     Capturing subpattern count = 0
3360     No options
3361     No first char
3362     No need char
3363    
3364     /[ab]/IS
3365     Capturing subpattern count = 0
3366     No options
3367     No first char
3368     No need char
3369     Starting character set: a b
3370    
3371     /[^a]/I
3372     Capturing subpattern count = 0
3373     No options
3374     No first char
3375     No need char
3376    
3377     /\d456/I
3378     Capturing subpattern count = 0
3379     No options
3380     No first char
3381     Need char = '6'
3382    
3383     /\d456/IS
3384     Capturing subpattern count = 0
3385     No options
3386     No first char
3387     Need char = '6'
3388     Starting character set: 0 1 2 3 4 5 6 7 8 9
3389    
3390     /a^b/I
3391     Capturing subpattern count = 0
3392     No options
3393     First char = 'a'
3394     Need char = 'b'
3395    
3396     /^a/mI
3397     Capturing subpattern count = 0
3398     Options: multiline
3399     First char at start or follows \n
3400     Need char = 'a'
3401     abcde
3402     0: a
3403     xy\nabc
3404     0: a
3405     *** Failers
3406     No match
3407     xyabc
3408     No match
3409    
3410     /c|abc/I
3411     Capturing subpattern count = 0
3412     No options
3413     No first char
3414     Need char = 'c'
3415    
3416     /(?i)[ab]/IS
3417     Capturing subpattern count = 0
3418     Options: caseless
3419     No first char
3420     No need char
3421     Starting character set: A B a b
3422    
3423     /[ab](?i)cd/IS
3424     Capturing subpattern count = 0
3425     No options
3426     Case state changes
3427     No first char
3428     Need char = 'd' (caseless)
3429     Starting character set: a b
3430    
3431     /abc(?C)def/
3432     Capturing subpattern count = 0
3433     No options
3434     First char = 'a'
3435     Need char = 'f'
3436     abcdef
3437     --->abcdef
3438     0 ^ ^
3439     0: abcdef
3440     1234abcdef
3441     --->1234abcdef
3442     0 ^ ^
3443     0: abcdef
3444     *** Failers
3445     No match
3446     abcxyz
3447     No match
3448     abcxyzf
3449     --->abcxyzf
3450     0 ^ ^
3451     No match
3452    
3453     /abc(?C)de(?C1)f/
3454     Capturing subpattern count = 0
3455     No options
3456     First char = 'a'
3457     Need char = 'f'
3458     123abcdef
3459     --->123abcdef
3460     0 ^ ^
3461     1 ^ ^
3462     0: abcdef
3463    
3464     /(?C1)\dabc(?C2)def/
3465     Capturing subpattern count = 0
3466     No options
3467     No first char
3468     Need char = 'f'
3469     1234abcdef
3470     --->1234abcdef
3471     1 ^
3472     1 ^
3473     1 ^
3474     1 ^
3475     2 ^ ^
3476     0: 4abcdef
3477     *** Failers
3478     No match
3479     abcdef
3480     --->abcdef
3481     1 ^
3482     1 ^
3483     1 ^
3484     1 ^
3485     1 ^
3486     1 ^
3487     No match
3488    
3489     /(?C255)ab/
3490     Capturing subpattern count = 0
3491     No options
3492     First char = 'a'
3493     Need char = 'b'
3494    
3495     /(?C256)ab/
3496     Failed: number after (?C is > 255 at offset 6
3497    
3498     /(?Cab)xx/
3499     Failed: closing ) for (?C expected at offset 3
3500    
3501     /(?C12vr)x/
3502     Failed: closing ) for (?C expected at offset 5
3503    
3504     /abc(?C)def/
3505     Capturing subpattern count = 0
3506     No options
3507     First char = 'a'
3508     Need char = 'f'
3509     *** Failers
3510     No match
3511     \x83\x0\x61bcdef
3512     --->\x83\x00abcdef
3513     0 ^ ^
3514     0: abcdef
3515    
3516     /(abc)(?C)de(?C1)f/
3517     Capturing subpattern count = 1
3518     No options
3519     First char = 'a'
3520     Need char = 'f'
3521     123abcdef
3522     --->123abcdef
3523     0 ^ ^
3524     1 ^ ^
3525     0: abcdef
3526     1: abc
3527     123abcdef\C+
3528     Callout 0: last capture = 1
3529     0: <unset>
3530     1: abc
3531     --->123abcdef
3532     ^ ^
3533     Callout 1: last capture = 1
3534     0: <unset>
3535     1: abc
3536     --->123abcdef
3537     ^ ^
3538     0: abcdef
3539     1: abc
3540     123abcdef\C-
3541     0: abcdef
3542     1: abc
3543     *** Failers
3544     No match
3545     123abcdef\C!1
3546     --->123abcdef
3547     0 ^ ^
3548     1 ^ ^
3549     No match
3550    
3551     /(?C0)(abc(?C1))*/
3552     Capturing subpattern count = 1
3553     No options
3554     No first char
3555     No need char
3556     abcabcabc
3557     --->abcabcabc
3558     0 ^
3559     1 ^ ^
3560     1 ^ ^
3561     1 ^ ^
3562     0: abcabcabc
3563     1: abc
3564     abcabc\C!1!3
3565     --->abcabc
3566     0 ^
3567     1 ^ ^
3568     1 ^ ^
3569     0: abcabc
3570     1: abc
3571     *** Failers
3572     --->*** Failers
3573     0 ^
3574     0:
3575     abcabcabc\C!1!3
3576     --->abcabcabc
3577     0 ^
3578     1 ^ ^
3579     1 ^ ^
3580     1 ^ ^
3581     0: abcabc
3582     1: abc
3583    
3584     /(\d{3}(?C))*/
3585     Capturing subpattern count = 1
3586     No options
3587     No first char
3588     No need char
3589     123\C+
3590     Callout 0: last capture = -1
3591     0: <unset>
3592     --->123
3593     ^ ^
3594     0: 123
3595     1: 123
3596     123456\C+
3597     Callout 0: last capture = -1
3598     0: <unset>
3599     --->123456
3600     ^ ^
3601     Callout 0: last capture = 1
3602     0: <unset>
3603     1: 123
3604     --->123456
3605     ^ ^
3606     0: 123456
3607     1: 456
3608     123456789\C+
3609     Callout 0: last capture = -1
3610     0: <unset>
3611     --->123456789
3612     ^ ^
3613     Callout 0: last capture = 1
3614     0: <unset>
3615     1: 123
3616     --->123456789
3617     ^ ^
3618     Callout 0: last capture = 1
3619     0: <unset>
3620     1: 456
3621     --->123456789
3622     ^ ^
3623     0: 123456789
3624     1: 789
3625    
3626     /((xyz)(?C)p|(?C1)xyzabc)/
3627     Capturing subpattern count = 2
3628     No options
3629     First char = 'x'
3630     No need char
3631     xyzabc\C+
3632     Callout 0: last capture = 2
3633     0: <unset>
3634     1: <unset>
3635     2: xyz
3636     --->xyzabc
3637     ^ ^
3638     Callout 1: last capture = -1
3639     0: <unset>
3640     --->xyzabc
3641     ^
3642     0: xyzabc
3643     1: xyzabc
3644    
3645     /(X)((xyz)(?C)p|(?C1)xyzabc)/
3646     Capturing subpattern count = 3
3647     No options
3648     First char = 'X'
3649     Need char = 'x'
3650     Xxyzabc\C+
3651     Callout 0: last capture = 3
3652     0: <unset>
3653     1: X
3654     2: <unset>
3655     3: xyz
3656     --->Xxyzabc
3657     ^ ^
3658     Callout 1: last capture = 1
3659     0: <unset>
3660     1: X
3661     --->Xxyzabc
3662     ^^
3663     0: Xxyzabc
3664     1: X
3665     2: xyzabc
3666    
3667     /(?=(abc))(?C)abcdef/
3668     Capturing subpattern count = 1
3669     No options
3670     First char = 'a'
3671     Need char = 'f'
3672     abcdef\C+
3673     Callout 0: last capture = 1
3674     0: <unset>
3675     1: abc
3676     --->abcdef
3677     ^
3678     0: abcdef
3679     1: abc
3680    
3681     /(?!(abc)(?C1)d)(?C2)abcxyz/
3682     Capturing subpattern count = 1
3683     No options
3684     First char = 'a'
3685     Need char = 'z'
3686     abcxyz\C+
3687     Callout 1: last capture = 1
3688     0: <unset>
3689     1: abc
3690     --->abcxyz
3691     ^ ^
3692     Callout 2: last capture = -1
3693     0: <unset>
3694     --->abcxyz
3695     ^
3696     0: abcxyz
3697    
3698     /(?<=(abc)(?C))xyz/
3699     Capturing subpattern count = 1
3700     No options
3701     First char = 'x'
3702     Need char = 'z'
3703     abcxyz\C+
3704     Callout 0: last capture = 1
3705     0: <unset>
3706     1: abc
3707     --->abcxyz
3708     ^
3709     0: xyz
3710     1: abc
3711    
3712     /(?C)abc/
3713     Capturing subpattern count = 0
3714     No options
3715     First char = 'a'
3716     Need char = 'c'
3717    
3718     /(?C)^abc/
3719     Capturing subpattern count = 0
3720     Options: anchored
3721     No first char
3722 nigel 65 No need char
3723 nigel 63
3724     /(?C)a|b/S
3725     Capturing subpattern count = 0
3726     No options
3727     No first char
3728     No need char
3729     Starting character set: a b
3730    
3731     /(?R)/
3732     Failed: recursive call could loop indefinitely at offset 3
3733    
3734     /(a|(?R))/
3735     Failed: recursive call could loop indefinitely at offset 6
3736    
3737     /(ab|(bc|(de|(?R))))/
3738     Failed: recursive call could loop indefinitely at offset 15
3739    
3740     /x(ab|(bc|(de|(?R))))/
3741     Capturing subpattern count = 3
3742     No options
3743     First char = 'x'
3744     No need char
3745     xab
3746     0: xab
3747     1: ab
3748     xbc
3749     0: xbc
3750     1: bc
3751     2: bc
3752     xde
3753     0: xde
3754     1: de
3755     2: de
3756     3: de
3757     xxab
3758     0: xxab
3759     1: xab
3760     2: xab
3761     3: xab
3762     xxxab
3763     0: xxxab
3764     1: xxab
3765     2: xxab
3766     3: xxab
3767     *** Failers
3768     No match
3769     xyab
3770     No match
3771    
3772     /(ab|(bc|(de|(?1))))/
3773     Failed: recursive call could loop indefinitely at offset 15
3774    
3775     /x(ab|(bc|(de|(?1)x)x)x)/
3776     Failed: recursive call could loop indefinitely at offset 16
3777    
3778     /^([^()]|\((?1)*\))*$/
3779     Capturing subpattern count = 1
3780     Options: anchored
3781     No first char
3782     No need char
3783     abc
3784     0: abc
3785     1: c
3786     a(b)c
3787     0: a(b)c
3788     1: c
3789     a(b(c))d
3790     0: a(b(c))d
3791     1: d
3792     *** Failers)
3793     No match
3794     a(b(c)d
3795     No match
3796    
3797     /^>abc>([^()]|\((?1)*\))*<xyz<$/
3798     Capturing subpattern count = 1
3799     Options: anchored
3800     No first char
3801     Need char = '<'
3802     >abc>123<xyz<
3803     0: >abc>123<xyz<
3804     1: 3
3805     >abc>1(2)3<xyz<
3806     0: >abc>1(2)3<xyz<
3807     1: 3
3808     >abc>(1(2)3)<xyz<
3809     0: >abc>(1(2)3)<xyz<
3810     1: (1(2)3)
3811    
3812     /(a(?1)b)/D
3813     ------------------------------------------------------------------
3814     0 18 Bra 0
3815     3 12 Bra 1
3816     6 1 a
3817     9 3 Recurse
3818     12 1 b
3819     15 12 Ket
3820     18 18 Ket
3821     21 End
3822     ------------------------------------------------------------------
3823     Capturing subpattern count = 1
3824     No options
3825     First char = 'a'
3826     Need char = 'b'
3827    
3828     /(a(?1)+b)/D
3829     ------------------------------------------------------------------
3830     0 24 Bra 0
3831     3 18 Bra 1
3832     6 1 a
3833     9 6 Bra 0
3834     12 3 Recurse
3835     15 6 KetRmax
3836     18 1 b
3837     21 18 Ket
3838     24 24 Ket
3839     27 End
3840     ------------------------------------------------------------------
3841     Capturing subpattern count = 1
3842     No options
3843     First char = 'a'
3844     Need char = 'b'
3845    
3846     /^\W*(?:((.)\W*(?1)\W*\2|)|((.)\W*(?3)\W*\4|\W*.\W*))\W*$/i
3847     Capturing subpattern count = 4
3848     Max back reference = 4
3849     Options: anchored caseless
3850     No first char
3851     No need char
3852     1221
3853     0: 1221
3854     1: 1221
3855     2: 1
3856     Satan, oscillate my metallic sonatas!
3857     0: Satan, oscillate my metallic sonatas!
3858     1: <unset>
3859     2: <unset>
3860     3: Satan, oscillate my metallic sonatas
3861     4: S
3862     A man, a plan, a canal: Panama!
3863     0: A man, a plan, a canal: Panama!
3864     1: <unset>
3865     2: <unset>
3866     3: A man, a plan, a canal: Panama
3867     4: A
3868     Able was I ere I saw Elba.
3869     0: Able was I ere I saw Elba.
3870     1: <unset>
3871     2: <unset>
3872     3: Able was I ere I saw Elba
3873     4: A
3874     *** Failers
3875     No match
3876     The quick brown fox
3877     No match
3878    
3879     /^(\d+|\((?1)([+*-])(?1)\)|-(?1))$/
3880     Capturing subpattern count = 2
3881     Options: anchored
3882     No first char
3883     No need char
3884     12
3885     0: 12
3886     1: 12
3887     (((2+2)*-3)-7)
3888     0: (((2+2)*-3)-7)
3889     1: (((2+2)*-3)-7)
3890     2: -
3891     -12
3892     0: -12
3893     1: -12
3894     *** Failers
3895     No match
3896     ((2+2)*-3)-7)
3897     No match
3898    
3899     /^(x(y|(?1){2})z)/
3900     Capturing subpattern count = 2
3901     Options: anchored
3902     No first char
3903 nigel 65 No need char
3904 nigel 63 xyz
3905     0: xyz
3906     1: xyz
3907     2: y
3908     xxyzxyzz
3909     0: xxyzxyzz
3910     1: xxyzxyzz
3911     2: xyzxyz
3912     *** Failers
3913     No match
3914     xxyzz
3915     No match
3916     xxyzxyzxyzz
3917     No match
3918    
3919     /((< (?: (?(R) \d++ | [^<>]*+) | (?2)) * >))/x
3920     Capturing subpattern count = 2
3921     Options: extended
3922     First char = '<'
3923     Need char = '>'
3924     <>
3925     0: <>
3926     1: <>
3927     2: <>
3928     <abcd>
3929     0: <abcd>
3930     1: <abcd>
3931     2: <abcd>
3932     <abc <123> hij>
3933     0: <abc <123> hij>
3934     1: <abc <123> hij>
3935     2: <abc <123> hij>
3936     <abc <def> hij>
3937     0: <def>
3938     1: <def>
3939     2: <def>
3940     <abc<>def>
3941     0: <abc<>def>
3942     1: <abc<>def>
3943     2: <abc<>def>
3944     <abc<>
3945     0: <>
3946     1: <>
3947     2: <>
3948     *** Failers
3949     No match
3950     <abc
3951     No match
3952    
3953     /(?1)/
3954     Failed: reference to non-existent subpattern at offset 3
3955    
3956     /((?2)(abc)/
3957     Failed: reference to non-existent subpattern at offset 4
3958    
3959     /^(abc)def(?1)/
3960     Capturing subpattern count = 1
3961     Options: anchored
3962     No first char
3963 nigel 65 No need char
3964 nigel 63 abcdefabc
3965     0: abcdefabc
3966     1: abc
3967    
3968     /^(a|b|c)=(?1)+/
3969     Capturing subpattern count = 1
3970     Options: anchored
3971     No first char
3972 nigel 65 No need char
3973 nigel 63 a=a
3974     0: a=a
3975     1: a
3976     a=b
3977     0: a=b
3978     1: a
3979     a=bc
3980     0: a=bc
3981     1: a
3982    
3983     /^(a|b|c)=((?1))+/
3984     Capturing subpattern count = 2
3985     Options: anchored
3986     No first char
3987 nigel 65 No need char
3988 nigel 63 a=a
3989     0: a=a
3990     1: a
3991     2: a
3992     a=b
3993     0: a=b
3994     1: a
3995     2: b
3996     a=bc
3997     0: a=bc
3998     1: a
3999     2: c
4000    
4001     /a(?P<name1>b|c)d(?P<longername2>e)/D
4002     ------------------------------------------------------------------
4003     0 33 Bra 0
4004     3 1 a
4005     6 6 Bra 1
4006     9 1 b
4007     12 6 Alt
4008     15 1 c
4009     18 12 Ket
4010     21 1 d
4011     24 6 Bra 2
4012     27 1 e
4013     30 6 Ket
4014     33 33 Ket
4015     36 End
4016     ------------------------------------------------------------------
4017     Capturing subpattern count = 2
4018     Named capturing subpatterns:
4019     longername2 2
4020     name1 1
4021     No options
4022     First char = 'a'
4023     Need char = 'e'
4024     abde
4025     0: abde
4026     1: b
4027     2: e
4028     acde
4029     0: acde
4030     1: c
4031     2: e
4032    
4033     /(?:a(?P<c>c(?P<d>d)))(?P<a>a)/D
4034     ------------------------------------------------------------------
4035     0 39 Bra 0
4036     3 24 Bra 0
4037     6 1 a
4038     9 15 Bra 1
4039     12 1 c
4040     15 6 Bra 2
4041     18 1 d
4042     21 6 Ket
4043     24 15 Ket
4044     27 24 Ket
4045     30 6 Bra 3
4046     33 1 a
4047     36 6 Ket
4048     39 39 Ket
4049     42 End
4050     ------------------------------------------------------------------
4051     Capturing subpattern count = 3
4052     Named capturing subpatterns:
4053     a 3
4054     c 1
4055     d 2
4056     No options
4057     First char = 'a'
4058     Need char = 'a'
4059    
4060     /(?P<a>a)...(?P=a)bbb(?P>a)d/D
4061     ------------------------------------------------------------------
4062     0 29 Bra 0
4063     3 6 Bra 1
4064     6 1 a
4065     9 6 Ket
4066     12 Any
4067     13 Any
4068     14 Any
4069     15 \1
4070     18 3 bbb
4071     23 3 Recurse
4072     26 1 d
4073     29 29 Ket
4074     32 End
4075     ------------------------------------------------------------------
4076     Capturing subpattern count = 1
4077     Max back reference = 1
4078     Named capturing subpatterns:
4079     a 1
4080     No options
4081     First char = 'a'
4082     Need char = 'd'
4083    
4084     /^\W*(?:(?P<one>(?P<two>.)\W*(?P>one)\W*(?P=two)|)|(?P<three>(?P<four>.)\W*(?P>three)\W*(?P=four)|\W*.\W*))\W*$/i
4085     Capturing subpattern count = 4
4086     Max back reference = 4
4087     Named capturing subpatterns:
4088     four 4
4089     one 1
4090     three 3
4091     two 2
4092     Options: anchored caseless
4093     No first char
4094     No need char
4095     1221
4096     0: 1221
4097     1: 1221
4098     2: 1
4099     Satan, oscillate my metallic sonatas!
4100     0: Satan, oscillate my metallic sonatas!
4101     1: <unset>
4102     2: <unset>
4103     3: Satan, oscillate my metallic sonatas
4104     4: S
4105     A man, a plan, a canal: Panama!
4106     0: A man, a plan, a canal: Panama!
4107     1: <unset>
4108     2: <unset>
4109     3: A man, a plan, a canal: Panama
4110     4: A
4111     Able was I ere I saw Elba.
4112     0: Able was I ere I saw Elba.
4113     1: <unset>
4114     2: <unset>
4115     3: Able was I ere I saw Elba
4116     4: A
4117     *** Failers
4118     No match
4119     The quick brown fox
4120     No match
4121    
4122     /((?(R)a|b))\1(?1)?/
4123     Capturing subpattern count = 1
4124     Max back reference = 1
4125     No options
4126     No first char
4127     No need char
4128     bb
4129     0: bb
4130     1: b
4131     bbaa
4132     0: bba
4133     1: b
4134    
4135     /(.*)a/sI
4136     Capturing subpattern count = 1
4137     Options: anchored dotall
4138     No first char
4139     Need char = 'a'
4140    
4141     /(.*)a\1/sI
4142     Capturing subpattern count = 1
4143     Max back reference = 1
4144     Options: dotall
4145     No first char
4146     Need char = 'a'
4147    
4148     /(.*)a(b)\2/sI
4149     Capturing subpattern count = 2
4150     Max back reference = 2
4151     Options: anchored dotall
4152     No first char
4153     Need char = 'b'
4154    
4155     /((.*)a|(.*)b)z/sI
4156     Capturing subpattern count = 3
4157     Options: anchored dotall
4158     No first char
4159     Need char = 'z'
4160    
4161     /((.*)a|(.*)b)z\1/sI
4162     Capturing subpattern count = 3
4163     Max back reference = 1
4164     Options: dotall
4165     No first char
4166     Need char = 'z'
4167    
4168     /((.*)a|(.*)b)z\2/sI
4169     Capturing subpattern count = 3
4170     Max back reference = 2
4171     Options: dotall
4172     No first char
4173     Need char = 'z'
4174    
4175     /((.*)a|(.*)b)z\3/sI
4176     Capturing subpattern count = 3
4177     Max back reference = 3
4178     Options: dotall
4179     No first char
4180     Need char = 'z'
4181    
4182     /((.*)a|^(.*)b)z\3/sI
4183     Capturing subpattern count = 3
4184     Max back reference = 3
4185     Options: anchored dotall
4186     No first char
4187     Need char = 'z'
4188    
4189     /(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)a/sI
4190     Capturing subpattern count = 31
4191     Options: anchored dotall
4192     No first char
4193     No need char
4194    
4195     /(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)a\31/sI
4196     Capturing subpattern count = 31
4197     Max back reference = 31
4198     Options: dotall
4199     No first char
4200     No need char
4201    
4202     /(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)a\32/sI
4203     Capturing subpattern count = 32
4204     Max back reference = 32
4205     Options: dotall
4206     No first char
4207     No need char
4208    
4209     /(a)(bc)/ND
4210     ------------------------------------------------------------------
4211     0 22 Bra 0
4212     3 6 Bra 0
4213     6 1 a
4214     9 6 Ket
4215     12 7 Bra 0
4216     15 2 bc
4217     19 7 Ket
4218     22 22 Ket
4219     25 End
4220     ------------------------------------------------------------------
4221     Capturing subpattern count = 0
4222     Options:
4223     First char = 'a'
4224     Need char = 'c'
4225     abc
4226     0: abc
4227    
4228     /(?P<one>a)(bc)/ND
4229     ------------------------------------------------------------------
4230     0 22 Bra 0
4231     3 6 Bra 1
4232     6 1 a
4233     9 6 Ket
4234     12 7 Bra 0
4235     15 2 bc
4236     19 7 Ket
4237     22 22 Ket
4238     25 End
4239     ------------------------------------------------------------------
4240     Capturing subpattern count = 1
4241     Named capturing subpatterns:
4242     one 1
4243     Options:
4244     First char = 'a'
4245     Need char = 'c'
4246     abc
4247     0: abc
4248     1: a
4249    
4250     /(a)(?P<named>bc)/ND
4251     ------------------------------------------------------------------
4252     0 22 Bra 0
4253     3 6 Bra 0
4254     6 1 a
4255     9 6 Ket
4256     12 7 Bra 1
4257     15 2 bc
4258     19 7 Ket
4259     22 22 Ket
4260     25 End
4261     ------------------------------------------------------------------
4262     Capturing subpattern count = 1
4263     Named capturing subpatterns:
4264     named 1
4265     Options:
4266     First char = 'a'
4267     Need char = 'c'
4268    
4269     /(a+)*zz/
4270     Capturing subpattern count = 1
4271     No options
4272     No first char
4273     Need char = 'z'
4274     aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaazzbbbbbb\M
4275     Minimum match limit = 8
4276     0: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaazz
4277     1: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
4278     aaaaaaaaaaaaaz\M
4279     Minimum match limit = 32768
4280     No match
4281    
4282     /(aaa(?C1)bbb|ab)/
4283     Capturing subpattern count = 1
4284     No options
4285     First char = 'a'
4286     Need char = 'b'
4287     aaabbb
4288     --->aaabbb
4289     1 ^ ^
4290     0: aaabbb
4291     1: aaabbb
4292     aaabbb\C*0
4293     --->aaabbb
4294     1 ^ ^
4295     0: aaabbb
4296     1: aaabbb
4297     aaabbb\C*1
4298     --->aaabbb
4299     1 ^ ^
4300     Callout data = 1
4301     0: ab
4302     1: ab
4303     aaabbb\C*-1
4304     --->aaabbb
4305     1 ^ ^
4306     Callout data = -1
4307     No match
4308    
4309     /ab(?P<one>cd)ef(?P<two>gh)/
4310     Capturing subpattern count = 2
4311     Named capturing subpatterns:
4312     one 1
4313     two 2
4314     No options
4315     First char = 'a'
4316     Need char = 'h'
4317     abcdefgh
4318     0: abcdefgh
4319     1: cd
4320     2: gh
4321     abcdefgh\C1\Gtwo
4322     0: abcdefgh
4323     1: cd
4324     2: gh
4325     1C cd (2)
4326     2G gh (2)
4327     abcdefgh\Cone\Ctwo
4328     0: abcdefgh
4329     1: cd
4330     2: gh
4331     1C cd (2)
4332     2C gh (2)
4333     abcdefgh\Cthree
4334     no parentheses with name "three"
4335     0: abcdefgh
4336     1: cd
4337     2: gh
4338    
4339     /(?P<Tes>)(?P<Test>)/D
4340     ------------------------------------------------------------------
4341     0 15 Bra 0
4342     3 3 Bra 1
4343     6 3 Ket
4344     9 3 Bra 2
4345     12 3 Ket
4346     15 15 Ket
4347     18 End
4348     ------------------------------------------------------------------
4349     Capturing subpattern count = 2
4350     Named capturing subpatterns:
4351     Tes 1
4352     Test 2
4353     No options
4354     No first char
4355     No need char
4356    
4357     /(?P<Test>)(?P<Tes>)/D
4358     ------------------------------------------------------------------
4359     0 15 Bra 0
4360     3 3 Bra 1
4361     6 3 Ket
4362     9 3 Bra 2
4363     12 3 Ket
4364     15 15 Ket
4365     18 End
4366     ------------------------------------------------------------------
4367     Capturing subpattern count = 2
4368     Named capturing subpatterns:
4369     Tes 2
4370     Test 1
4371     No options
4372     No first char
4373     No need char
4374    
4375     /(?P<Z>zz)(?P<A>aa)/
4376     Capturing subpattern count = 2
4377     Named capturing subpatterns:
4378     A 2
4379     Z 1
4380     No options
4381     First char = 'z'
4382     Need char = 'a'
4383     zzaa\CZ
4384     0: zzaa
4385     1: zz
4386     2: aa
4387     1C zz (2)
4388     zzaa\CA
4389     0: zzaa
4390     1: zz
4391     2: aa
4392     2C aa (2)
4393    
4394 nigel 65 /(?P<x>eks)(?P<x>eccs)/
4395     Failed: two named groups have the same name at offset 16
4396    
4397     /(?P<abc>abc(?P<def>def)(?P<abc>xyz))/
4398     Failed: two named groups have the same name at offset 31
4399    
4400 nigel 73 "\[((?P<elem>\d+)(,(?P>elem))*)\]"
4401     Capturing subpattern count = 3
4402     Named capturing subpatterns:
4403     elem 2
4404     No options
4405     First char = '['
4406     Need char = ']'
4407     [10,20,30,5,5,4,4,2,43,23,4234]
4408     0: [10,20,30,5,5,4,4,2,43,23,4234]
4409     1: 10,20,30,5,5,4,4,2,43,23,4234
4410     2: 10
4411     3: ,4234
4412     *** Failers
4413  </