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Load pcre-3.4 into code/trunk.

1 nigel 3 ChangeLog for PCRE
2     ------------------
3    
4 nigel 5
5 nigel 51 Version 3.4 22-Aug-00
6     ---------------------
7    
8     1. Fixed typo in pcre.h: unsigned const char * changed to const unsigned char *.
9    
10     2. Diagnose condition (?(0) as an error instead of crashing on matching.
11    
12    
13 nigel 49 Version 3.3 01-Aug-00
14     ---------------------
15    
16     1. If an octal character was given, but the value was greater than \377, it
17     was not getting masked to the least significant bits, as documented. This could
18     lead to crashes in some systems.
19    
20     2. Perl 5.6 (if not earlier versions) accepts classes like [a-\d] and treats
21     the hyphen as a literal. PCRE used to give an error; it now behaves like Perl.
22    
23     3. Added the functions pcre_free_substring() and pcre_free_substring_list().
24     These just pass their arguments on to (pcre_free)(), but they are provided
25     because some uses of PCRE bind it to non-C systems that can call its functions,
26     but cannot call free() or pcre_free() directly.
27    
28     4. Add "make test" as a synonym for "make check". Corrected some comments in
29     the Makefile.
30    
31     5. Add $(DESTDIR)/ in front of all the paths in the "install" target in the
32     Makefile.
33    
34     6. Changed the name of pgrep to pcregrep, because Solaris has introduced a
35     command called pgrep for grepping around the active processes.
36    
37     7. Added the beginnings of support for UTF-8 character strings.
38    
39     8. Arranged for the Makefile to pass over the settings of CC, CFLAGS, and
40     RANLIB to ./ltconfig so that they are used by libtool. I think these are all
41     the relevant ones. (AR is not passed because ./ltconfig does its own figuring
42     out for the ar command.)
43    
44    
45 nigel 47 Version 3.2 12-May-00
46     ---------------------
47    
48     This is purely a bug fixing release.
49    
50     1. If the pattern /((Z)+|A)*/ was matched agained ZABCDEFG it matched Z instead
51     of ZA. This was just one example of several cases that could provoke this bug,
52     which was introduced by change 9 of version 2.00. The code for breaking
53     infinite loops after an iteration that matches an empty string was't working
54     correctly.
55    
56     2. The pcretest program was not imitating Perl correctly for the pattern /a*/g
57     when matched against abbab (for example). After matching an empty string, it
58     wasn't forcing anchoring when setting PCRE_NOTEMPTY for the next attempt; this
59     caused it to match further down the string than it should.
60    
61     3. The code contained an inclusion of sys/types.h. It isn't clear why this
62     was there because it doesn't seem to be needed, and it causes trouble on some
63     systems, as it is not a Standard C header. It has been removed.
64    
65     4. Made 4 silly changes to the source to avoid stupid compiler warnings that
66     were reported on the Macintosh. The changes were from
67    
68     while ((c = *(++ptr)) != 0 && c != '\n');
69     to
70     while ((c = *(++ptr)) != 0 && c != '\n') ;
71    
72     Totally extraordinary, but if that's what it takes...
73    
74     5. PCRE is being used in one environment where neither memmove() nor bcopy() is
75     available. Added HAVE_BCOPY and an autoconf test for it; if neither
76     HAVE_MEMMOVE nor HAVE_BCOPY is set, use a built-in emulation function which
77     assumes the way PCRE uses memmove() (always moving upwards).
78    
79     6. PCRE is being used in one environment where strchr() is not available. There
80     was only one use in pcre.c, and writing it out to avoid strchr() probably gives
81     faster code anyway.
82    
83    
84 nigel 45 Version 3.1 09-Feb-00
85     ---------------------
86    
87     The only change in this release is the fixing of some bugs in Makefile.in for
88     the "install" target:
89    
90     (1) It was failing to install pcreposix.h.
91    
92     (2) It was overwriting the pcre.3 man page with the pcreposix.3 man page.
93    
94    
95 nigel 43 Version 3.0 01-Feb-00
96     ---------------------
97 nigel 41
98     1. Add support for the /+ modifier to perltest (to output $` like it does in
99     pcretest).
100    
101     2. Add support for the /g modifier to perltest.
102    
103     3. Fix pcretest so that it behaves even more like Perl for /g when the pattern
104     matches null strings.
105    
106     4. Fix perltest so that it doesn't do unwanted things when fed an empty
107     pattern. Perl treats empty patterns specially - it reuses the most recent
108     pattern, which is not what we want. Replace // by /(?#)/ in order to avoid this
109     effect.
110    
111     5. The POSIX interface was broken in that it was just handing over the POSIX
112     captured string vector to pcre_exec(), but (since release 2.00) PCRE has
113     required a bigger vector, with some working space on the end. This means that
114     the POSIX wrapper now has to get and free some memory, and copy the results.
115    
116 nigel 43 6. Added some simple autoconf support, placing the test data and the
117     documentation in separate directories, re-organizing some of the
118     information files, and making it build pcre-config (a GNU standard). Also added
119     libtool support for building PCRE as a shared library, which is now the
120     default.
121 nigel 41
122 nigel 43 7. Got rid of the leading zero in the definition of PCRE_MINOR because 08 and
123     09 are not valid octal constants. Single digits will be used for minor values
124     less than 10.
125    
126     8. Defined REG_EXTENDED and REG_NOSUB as zero in the POSIX header, so that
127     existing programs that set these in the POSIX interface can use PCRE without
128     modification.
129    
130     9. Added a new function, pcre_fullinfo() with an extensible interface. It can
131     return all that pcre_info() returns, plus additional data. The pcre_info()
132     function is retained for compatibility, but is considered to be obsolete.
133    
134     10. Added experimental recursion feature (?R) to handle one common case that
135     Perl 5.6 will be able to do with (?p{...}).
136    
137     11. Added support for POSIX character classes like [:alpha:], which Perl is
138     adopting.
139    
140    
141 nigel 39 Version 2.08 31-Aug-99
142     ----------------------
143    
144     1. When startoffset was not zero and the pattern began with ".*", PCRE was not
145     trying to match at the startoffset position, but instead was moving forward to
146     the next newline as if a previous match had failed.
147    
148     2. pcretest was not making use of PCRE_NOTEMPTY when repeating for /g and /G,
149     and could get into a loop if a null string was matched other than at the start
150     of the subject.
151    
152     3. Added definitions of PCRE_MAJOR and PCRE_MINOR to pcre.h so the version can
153     be distinguished at compile time, and for completeness also added PCRE_DATE.
154    
155     5. Added Paul Sokolovsky's minor changes to make it easy to compile a Win32 DLL
156     in GnuWin32 environments.
157    
158    
159 nigel 37 Version 2.07 29-Jul-99
160     ----------------------
161    
162     1. The documentation is now supplied in plain text form and HTML as well as in
163     the form of man page sources.
164    
165     2. C++ compilers don't like assigning (void *) values to other pointer types.
166     In particular this affects malloc(). Although there is no problem in Standard
167     C, I've put in casts to keep C++ compilers happy.
168    
169     3. Typo on pcretest.c; a cast of (unsigned char *) in the POSIX regexec() call
170     should be (const char *).
171    
172     4. If NOPOSIX is defined, pcretest.c compiles without POSIX support. This may
173     be useful for non-Unix systems who don't want to bother with the POSIX stuff.
174     However, I haven't made this a standard facility. The documentation doesn't
175     mention it, and the Makefile doesn't support it.
176    
177     5. The Makefile now contains an "install" target, with editable destinations at
178     the top of the file. The pcretest program is not installed.
179    
180     6. pgrep -V now gives the PCRE version number and date.
181    
182     7. Fixed bug: a zero repetition after a literal string (e.g. /abcde{0}/) was
183     causing the entire string to be ignored, instead of just the last character.
184    
185     8. If a pattern like /"([^\\"]+|\\.)*"/ is applied in the normal way to a
186     non-matching string, it can take a very, very long time, even for strings of
187     quite modest length, because of the nested recursion. PCRE now does better in
188     some of these cases. It does this by remembering the last required literal
189     character in the pattern, and pre-searching the subject to ensure it is present
190     before running the real match. In other words, it applies a heuristic to detect
191     some types of certain failure quickly, and in the above example, if presented
192     with a string that has no trailing " it gives "no match" very quickly.
193    
194     9. A new runtime option PCRE_NOTEMPTY causes null string matches to be ignored;
195     other alternatives are tried instead.
196    
197    
198 nigel 35 Version 2.06 09-Jun-99
199     ----------------------
200    
201     1. Change pcretest's output for amount of store used to show just the code
202     space, because the remainder (the data block) varies in size between 32-bit and
203     64-bit systems.
204    
205     2. Added an extra argument to pcre_exec() to supply an offset in the subject to
206     start matching at. This allows lookbehinds to work when searching for multiple
207     occurrences in a string.
208    
209     3. Added additional options to pcretest for testing multiple occurrences:
210    
211     /+ outputs the rest of the string that follows a match
212     /g loops for multiple occurrences, using the new startoffset argument
213     /G loops for multiple occurrences by passing an incremented pointer
214    
215     4. PCRE wasn't doing the "first character" optimization for patterns starting
216     with \b or \B, though it was doing it for other lookbehind assertions. That is,
217     it wasn't noticing that a match for a pattern such as /\bxyz/ has to start with
218     the letter 'x'. On long subject strings, this gives a significant speed-up.
219    
220    
221 nigel 33 Version 2.05 21-Apr-99
222     ----------------------
223    
224     1. Changed the type of magic_number from int to long int so that it works
225     properly on 16-bit systems.
226    
227     2. Fixed a bug which caused patterns starting with .* not to work correctly
228     when the subject string contained newline characters. PCRE was assuming
229     anchoring for such patterns in all cases, which is not correct because .* will
230     not pass a newline unless PCRE_DOTALL is set. It now assumes anchoring only if
231     DOTALL is set at top level; otherwise it knows that patterns starting with .*
232     must be retried after every newline in the subject.
233    
234    
235 nigel 31 Version 2.04 18-Feb-99
236     ----------------------
237    
238     1. For parenthesized subpatterns with repeats whose minimum was zero, the
239     computation of the store needed to hold the pattern was incorrect (too large).
240     If such patterns were nested a few deep, this could multiply and become a real
241     problem.
242    
243     2. Added /M option to pcretest to show the memory requirement of a specific
244     pattern. Made -m a synonym of -s (which does this globally) for compatibility.
245    
246     3. Subpatterns of the form (regex){n,m} (i.e. limited maximum) were being
247     compiled in such a way that the backtracking after subsequent failure was
248     pessimal. Something like (a){0,3} was compiled as (a)?(a)?(a)? instead of
249     ((a)((a)(a)?)?)? with disastrous performance if the maximum was of any size.
250    
251    
252 nigel 29 Version 2.03 02-Feb-99
253     ----------------------
254    
255     1. Fixed typo and small mistake in man page.
256    
257 nigel 31 2. Added 4th condition (GPL supersedes if conflict) and created separate
258     LICENCE file containing the conditions.
259 nigel 29
260     3. Updated pcretest so that patterns such as /abc\/def/ work like they do in
261     Perl, that is the internal \ allows the delimiter to be included in the
262     pattern. Locked out the use of \ as a delimiter. If \ immediately follows
263     the final delimiter, add \ to the end of the pattern (to test the error).
264    
265     4. Added the convenience functions for extracting substrings after a successful
266     match. Updated pcretest to make it able to test these functions.
267    
268    
269 nigel 27 Version 2.02 14-Jan-99
270     ----------------------
271    
272     1. Initialized the working variables associated with each extraction so that
273     their saving and restoring doesn't refer to uninitialized store.
274    
275     2. Put dummy code into study.c in order to trick the optimizer of the IBM C
276     compiler for OS/2 into generating correct code. Apparently IBM isn't going to
277     fix the problem.
278    
279     3. Pcretest: the timing code wasn't using LOOPREPEAT for timing execution
280     calls, and wasn't printing the correct value for compiling calls. Increased the
281     default value of LOOPREPEAT, and the number of significant figures in the
282     times.
283    
284     4. Changed "/bin/rm" in the Makefile to "-rm" so it works on Windows NT.
285    
286     5. Renamed "deftables" as "dftables" to get it down to 8 characters, to avoid
287     a building problem on Windows NT with a FAT file system.
288    
289    
290 nigel 25 Version 2.01 21-Oct-98
291     ----------------------
292    
293     1. Changed the API for pcre_compile() to allow for the provision of a pointer
294     to character tables built by pcre_maketables() in the current locale. If NULL
295     is passed, the default tables are used.
296    
297    
298 nigel 23 Version 2.00 24-Sep-98
299 nigel 21 ----------------------
300    
301 nigel 23 1. Since the (>?) facility is in Perl 5.005, don't require PCRE_EXTRA to enable
302     it any more.
303    
304     2. Allow quantification of (?>) groups, and make it work correctly.
305    
306     3. The first character computation wasn't working for (?>) groups.
307    
308     4. Correct the implementation of \Z (it is permitted to match on the \n at the
309     end of the subject) and add 5.005's \z, which really does match only at the
310     very end of the subject.
311    
312     5. Remove the \X "cut" facility; Perl doesn't have it, and (?> is neater.
313    
314     6. Remove the ability to specify CASELESS, MULTILINE, DOTALL, and
315     DOLLAR_END_ONLY at runtime, to make it possible to implement the Perl 5.005
316     localized options. All options to pcre_study() were also removed.
317    
318     7. Add other new features from 5.005:
319    
320     $(?<= positive lookbehind
321     $(?<! negative lookbehind
322     (?imsx-imsx) added the unsetting capability
323     such a setting is global if at outer level; local otherwise
324     (?imsx-imsx:) non-capturing groups with option setting
325     (?(cond)re|re) conditional pattern matching
326    
327     A backreference to itself in a repeated group matches the previous
328     captured string.
329    
330     8. General tidying up of studying (both automatic and via "study")
331     consequential on the addition of new assertions.
332    
333     9. As in 5.005, unlimited repeated groups that could match an empty substring
334     are no longer faulted at compile time. Instead, the loop is forcibly broken at
335     runtime if any iteration does actually match an empty substring.
336    
337     10. Include the RunTest script in the distribution.
338    
339     11. Added tests from the Perl 5.005_02 distribution. This showed up a few
340     discrepancies, some of which were old and were also with respect to 5.004. They
341     have now been fixed.
342    
343    
344     Version 1.09 28-Apr-98
345     ----------------------
346    
347 nigel 21 1. A negated single character class followed by a quantifier with a minimum
348     value of one (e.g. [^x]{1,6} ) was not compiled correctly. This could lead to
349     program crashes, or just wrong answers. This did not apply to negated classes
350     containing more than one character, or to minima other than one.
351    
352    
353 nigel 19 Version 1.08 27-Mar-98
354     ----------------------
355    
356     1. Add PCRE_UNGREEDY to invert the greediness of quantifiers.
357    
358     2. Add (?U) and (?X) to set PCRE_UNGREEDY and PCRE_EXTRA respectively. The
359     latter must appear before anything that relies on it in the pattern.
360    
361    
362 nigel 17 Version 1.07 16-Feb-98
363     ----------------------
364    
365     1. A pattern such as /((a)*)*/ was not being diagnosed as in error (unlimited
366     repeat of a potentially empty string).
367    
368    
369 nigel 15 Version 1.06 23-Jan-98
370     ----------------------
371    
372     1. Added Markus Oberhumer's little patches for C++.
373    
374     2. Literal strings longer than 255 characters were broken.
375    
376    
377 nigel 13 Version 1.05 23-Dec-97
378     ----------------------
379    
380     1. Negated character classes containing more than one character were failing if
381     PCRE_CASELESS was set at run time.
382    
383    
384 nigel 11 Version 1.04 19-Dec-97
385     ----------------------
386    
387     1. Corrected the man page, where some "const" qualifiers had been omitted.
388    
389     2. Made debugging output print "{0,xxx}" instead of just "{,xxx}" to agree with
390     input syntax.
391    
392     3. Fixed memory leak which occurred when a regex with back references was
393     matched with an offsets vector that wasn't big enough. The temporary memory
394     that is used in this case wasn't being freed if the match failed.
395    
396     4. Tidied pcretest to ensure it frees memory that it gets.
397    
398     5. Temporary memory was being obtained in the case where the passed offsets
399     vector was exactly big enough.
400    
401     6. Corrected definition of offsetof() from change 5 below.
402    
403     7. I had screwed up change 6 below and broken the rules for the use of
404     setjmp(). Now fixed.
405    
406    
407 nigel 9 Version 1.03 18-Dec-97
408     ----------------------
409    
410     1. A erroneous regex with a missing opening parenthesis was correctly
411     diagnosed, but PCRE attempted to access brastack[-1], which could cause crashes
412     on some systems.
413    
414     2. Replaced offsetof(real_pcre, code) by offsetof(real_pcre, code[0]) because
415     it was reported that one broken compiler failed on the former because "code" is
416     also an independent variable.
417    
418     3. The erroneous regex a[]b caused an array overrun reference.
419    
420     4. A regex ending with a one-character negative class (e.g. /[^k]$/) did not
421     fail on data ending with that character. (It was going on too far, and checking
422     the next character, typically a binary zero.) This was specific to the
423     optimized code for single-character negative classes.
424    
425     5. Added a contributed patch from the TIN world which does the following:
426    
427     + Add an undef for memmove, in case the the system defines a macro for it.
428    
429     + Add a definition of offsetof(), in case there isn't one. (I don't know
430     the reason behind this - offsetof() is part of the ANSI standard - but
431     it does no harm).
432    
433     + Reduce the ifdef's in pcre.c using macro DPRINTF, thereby eliminating
434     most of the places where whitespace preceded '#'. I have given up and
435     allowed the remaining 2 cases to be at the margin.
436    
437     + Rename some variables in pcre to eliminate shadowing. This seems very
438     pedantic, but does no harm, of course.
439    
440     6. Moved the call to setjmp() into its own function, to get rid of warnings
441     from gcc -Wall, and avoided calling it at all unless PCRE_EXTRA is used.
442    
443     7. Constructs such as \d{8,} were compiling into the equivalent of
444 nigel 11 \d{8}\d{0,65527} instead of \d{8}\d* which didn't make much difference to the
445 nigel 9 outcome, but in this particular case used more store than had been allocated,
446     which caused the bug to be discovered because it threw up an internal error.
447    
448     8. The debugging code in both pcre and pcretest for outputting the compiled
449     form of a regex was going wrong in the case of back references followed by
450     curly-bracketed repeats.
451    
452    
453 nigel 7 Version 1.02 12-Dec-97
454     ----------------------
455    
456     1. Typos in pcre.3 and comments in the source fixed.
457    
458     2. Applied a contributed patch to get rid of places where it used to remove
459     'const' from variables, and fixed some signed/unsigned and uninitialized
460     variable warnings.
461    
462     3. Added the "runtest" target to Makefile.
463    
464     4. Set default compiler flag to -O2 rather than just -O.
465    
466    
467 nigel 5 Version 1.01 19-Nov-97
468     ----------------------
469    
470     1. PCRE was failing to diagnose unlimited repeat of empty string for patterns
471     like /([ab]*)*/, that is, for classes with more than one character in them.
472    
473     2. Likewise, it wasn't diagnosing patterns with "once-only" subpatterns, such
474     as /((?>a*))*/ (a PCRE_EXTRA facility).
475    
476    
477     Version 1.00 18-Nov-97
478     ----------------------
479    
480     1. Added compile-time macros to support systems such as SunOS4 which don't have
481     memmove() or strerror() but have other things that can be used instead.
482    
483     2. Arranged that "make clean" removes the executables.
484    
485    
486 nigel 3 Version 0.99 27-Oct-97
487     ----------------------
488    
489     1. Fixed bug in code for optimizing classes with only one character. It was
490     initializing a 32-byte map regardless, which could cause it to run off the end
491     of the memory it had got.
492    
493     2. Added, conditional on PCRE_EXTRA, the proposed (?>REGEX) construction.
494    
495    
496     Version 0.98 22-Oct-97
497     ----------------------
498    
499     1. Fixed bug in code for handling temporary memory usage when there are more
500     back references than supplied space in the ovector. This could cause segfaults.
501    
502    
503     Version 0.97 21-Oct-97
504     ----------------------
505    
506     1. Added the \X "cut" facility, conditional on PCRE_EXTRA.
507    
508     2. Optimized negated single characters not to use a bit map.
509    
510     3. Brought error texts together as macro definitions; clarified some of them;
511     fixed one that was wrong - it said "range out of order" when it meant "invalid
512     escape sequence".
513    
514     4. Changed some char * arguments to const char *.
515    
516     5. Added PCRE_NOTBOL and PCRE_NOTEOL (from POSIX).
517    
518     6. Added the POSIX-style API wrapper in pcreposix.a and testing facilities in
519     pcretest.
520    
521    
522     Version 0.96 16-Oct-97
523     ----------------------
524    
525     1. Added a simple "pgrep" utility to the distribution.
526    
527     2. Fixed an incompatibility with Perl: "{" is now treated as a normal character
528     unless it appears in one of the precise forms "{ddd}", "{ddd,}", or "{ddd,ddd}"
529     where "ddd" means "one or more decimal digits".
530    
531     3. Fixed serious bug. If a pattern had a back reference, but the call to
532     pcre_exec() didn't supply a large enough ovector to record the related
533     identifying subpattern, the match always failed. PCRE now remembers the number
534     of the largest back reference, and gets some temporary memory in which to save
535     the offsets during matching if necessary, in order to ensure that
536     backreferences always work.
537    
538     4. Increased the compatibility with Perl in a number of ways:
539    
540     (a) . no longer matches \n by default; an option PCRE_DOTALL is provided
541     to request this handling. The option can be set at compile or exec time.
542    
543     (b) $ matches before a terminating newline by default; an option
544     PCRE_DOLLAR_ENDONLY is provided to override this (but not in multiline
545     mode). The option can be set at compile or exec time.
546    
547     (c) The handling of \ followed by a digit other than 0 is now supposed to be
548     the same as Perl's. If the decimal number it represents is less than 10
549     or there aren't that many previous left capturing parentheses, an octal
550     escape is read. Inside a character class, it's always an octal escape,
551     even if it is a single digit.
552    
553     (d) An escaped but undefined alphabetic character is taken as a literal,
554     unless PCRE_EXTRA is set. Currently this just reserves the remaining
555     escapes.
556    
557     (e) {0} is now permitted. (The previous item is removed from the compiled
558     pattern).
559    
560     5. Changed all the names of code files so that the basic parts are no longer
561     than 10 characters, and abolished the teeny "globals.c" file.
562    
563     6. Changed the handling of character classes; they are now done with a 32-byte
564     bit map always.
565    
566     7. Added the -d and /D options to pcretest to make it possible to look at the
567     internals of compilation without having to recompile pcre.
568    
569    
570     Version 0.95 23-Sep-97
571     ----------------------
572    
573     1. Fixed bug in pre-pass concerning escaped "normal" characters such as \x5c or
574     \x20 at the start of a run of normal characters. These were being treated as
575     real characters, instead of the source characters being re-checked.
576    
577    
578     Version 0.94 18-Sep-97
579     ----------------------
580    
581     1. The functions are now thread-safe, with the caveat that the global variables
582     containing pointers to malloc() and free() or alternative functions are the
583     same for all threads.
584    
585     2. Get pcre_study() to generate a bitmap of initial characters for non-
586     anchored patterns when this is possible, and use it if passed to pcre_exec().
587    
588    
589     Version 0.93 15-Sep-97
590     ----------------------
591    
592     1. /(b)|(:+)/ was computing an incorrect first character.
593    
594     2. Add pcre_study() to the API and the passing of pcre_extra to pcre_exec(),
595     but not actually doing anything yet.
596    
597     3. Treat "-" characters in classes that cannot be part of ranges as literals,
598     as Perl does (e.g. [-az] or [az-]).
599    
600     4. Set the anchored flag if a branch starts with .* or .*? because that tests
601     all possible positions.
602    
603     5. Split up into different modules to avoid including unneeded functions in a
604     compiled binary. However, compile and exec are still in one module. The "study"
605     function is split off.
606    
607     6. The character tables are now in a separate module whose source is generated
608     by an auxiliary program - but can then be edited by hand if required. There are
609     now no calls to isalnum(), isspace(), isdigit(), isxdigit(), tolower() or
610     toupper() in the code.
611    
612     7. Turn the malloc/free funtions variables into pcre_malloc and pcre_free and
613     make them global. Abolish the function for setting them, as the caller can now
614     set them directly.
615    
616    
617     Version 0.92 11-Sep-97
618     ----------------------
619    
620     1. A repeat with a fixed maximum and a minimum of 1 for an ordinary character
621     (e.g. /a{1,3}/) was broken (I mis-optimized it).
622    
623     2. Caseless matching was not working in character classes if the characters in
624     the pattern were in upper case.
625    
626     3. Make ranges like [W-c] work in the same way as Perl for caseless matching.
627    
628     4. Make PCRE_ANCHORED public and accept as a compile option.
629    
630     5. Add an options word to pcre_exec() and accept PCRE_ANCHORED and
631     PCRE_CASELESS at run time. Add escapes \A and \I to pcretest to cause it to
632     pass them.
633    
634     6. Give an error if bad option bits passed at compile or run time.
635    
636     7. Add PCRE_MULTILINE at compile and exec time, and (?m) as well. Add \M to
637     pcretest to cause it to pass that flag.
638    
639     8. Add pcre_info(), to get the number of identifying subpatterns, the stored
640     options, and the first character, if set.
641    
642     9. Recognize C+ or C{n,m} where n >= 1 as providing a fixed starting character.
643    
644    
645     Version 0.91 10-Sep-97
646     ----------------------
647    
648     1. PCRE was failing to diagnose unlimited repeats of subpatterns that could
649     match the empty string as in /(a*)*/. It was looping and ultimately crashing.
650    
651     2. PCRE was looping on encountering an indefinitely repeated back reference to
652     a subpattern that had matched an empty string, e.g. /(a|)\1*/. It now does what
653     Perl does - treats the match as successful.
654    
655     ****

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