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Revision 49 - (hide annotations) (download)
Sat Feb 24 21:39:33 2007 UTC (7 years, 5 months ago) by nigel
File size: 24604 byte(s)
Load pcre-3.3 into code/trunk.

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

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