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Load pcre-3.9 into code/trunk.

1 nigel 3 ChangeLog for PCRE
2     ------------------
3    
4 nigel 61 Version 3.0 02-Jan-02
5     ---------------------
6    
7     1. A bit of extraneous text had somehow crept into the pcregrep documentation.
8    
9     2. If --disable-static was given, the building process failed when trying to
10     build pcretest and pcregrep. (For some reason it was using libtool to compile
11     them, which is not right, as they aren't part of the library.)
12    
13    
14 nigel 59 Version 3.8 18-Dec-01
15     ---------------------
16    
17     1. The experimental UTF-8 code was completely screwed up. It was packing the
18     bytes in the wrong order. How dumb can you get?
19    
20    
21 nigel 57 Version 3.7 29-Oct-01
22     ---------------------
23    
24     1. In updating pcretest to check change 1 of version 3.6, I screwed up.
25     This caused pcretest, when used on the test data, to segfault. Unfortunately,
26     this didn't happen under Solaris 8, where I normally test things.
27    
28 nigel 59 2. The Makefile had to be changed to make it work on BSD systems, where 'make'
29     doesn't seem to recognize that ./xxx and xxx are the same file. (This entry
30     isn't in ChangeLog distributed with 3.7 because I forgot when I hastily made
31     this fix an hour or so after the initial 3.7 release.)
32 nigel 57
33 nigel 59
34 nigel 55 Version 3.6 23-Oct-01
35     ---------------------
36    
37     1. Crashed with /(sens|respons)e and \1ibility/ and "sense and sensibility" if
38     offsets passed as NULL with zero offset count.
39    
40     2. The config.guess and config.sub files had not been updated when I moved to
41     the latest autoconf.
42    
43    
44 nigel 53 Version 3.5 15-Aug-01
45     ---------------------
46 nigel 5
47 nigel 53 1. Added some missing #if !defined NOPOSIX conditionals in pcretest.c that
48     had been forgotten.
49    
50     2. By using declared but undefined structures, we can avoid using "void"
51     definitions in pcre.h while keeping the internal definitions of the structures
52     private.
53    
54     3. The distribution is now built using autoconf 2.50 and libtool 1.4. From a
55     user point of view, this means that both static and shared libraries are built
56     by default, but this can be individually controlled. More of the work of
57     handling this static/shared cases is now inside libtool instead of PCRE's make
58     file.
59    
60     4. The pcretest utility is now installed along with pcregrep because it is
61     useful for users (to test regexs) and by doing this, it automatically gets
62     relinked by libtool. The documentation has been turned into a man page, so
63     there are now .1, .txt, and .html versions in /doc.
64    
65     5. Upgrades to pcregrep:
66     (i) Added long-form option names like gnu grep.
67     (ii) Added --help to list all options with an explanatory phrase.
68     (iii) Added -r, --recursive to recurse into sub-directories.
69     (iv) Added -f, --file to read patterns from a file.
70    
71     6. pcre_exec() was referring to its "code" argument before testing that
72     argument for NULL (and giving an error if it was NULL).
73    
74     7. Upgraded Makefile.in to allow for compiling in a different directory from
75     the source directory.
76    
77     8. Tiny buglet in pcretest: when pcre_fullinfo() was called to retrieve the
78     options bits, the pointer it was passed was to an int instead of to an unsigned
79     long int. This mattered only on 64-bit systems.
80    
81     9. Fixed typo (3.4/1) in pcre.h again. Sigh. I had changed pcre.h (which is
82     generated) instead of pcre.in, which it its source. Also made the same change
83     in several of the .c files.
84    
85     10. A new release of gcc defines printf() as a macro, which broke pcretest
86     because it had an ifdef in the middle of a string argument for printf(). Fixed
87     by using separate calls to printf().
88    
89     11. Added --enable-newline-is-cr and --enable-newline-is-lf to the configure
90     script, to force use of CR or LF instead of \n in the source. On non-Unix
91     systems, the value can be set in config.h.
92    
93     12. The limit of 200 on non-capturing parentheses is a _nesting_ limit, not an
94     absolute limit. Changed the text of the error message to make this clear, and
95     likewise updated the man page.
96    
97     13. The limit of 99 on the number of capturing subpatterns has been removed.
98     The new limit is 65535, which I hope will not be a "real" limit.
99    
100    
101 nigel 51 Version 3.4 22-Aug-00
102     ---------------------
103    
104     1. Fixed typo in pcre.h: unsigned const char * changed to const unsigned char *.
105    
106     2. Diagnose condition (?(0) as an error instead of crashing on matching.
107    
108    
109 nigel 49 Version 3.3 01-Aug-00
110     ---------------------
111    
112     1. If an octal character was given, but the value was greater than \377, it
113     was not getting masked to the least significant bits, as documented. This could
114     lead to crashes in some systems.
115    
116     2. Perl 5.6 (if not earlier versions) accepts classes like [a-\d] and treats
117     the hyphen as a literal. PCRE used to give an error; it now behaves like Perl.
118    
119     3. Added the functions pcre_free_substring() and pcre_free_substring_list().
120     These just pass their arguments on to (pcre_free)(), but they are provided
121     because some uses of PCRE bind it to non-C systems that can call its functions,
122     but cannot call free() or pcre_free() directly.
123    
124     4. Add "make test" as a synonym for "make check". Corrected some comments in
125     the Makefile.
126    
127     5. Add $(DESTDIR)/ in front of all the paths in the "install" target in the
128     Makefile.
129    
130     6. Changed the name of pgrep to pcregrep, because Solaris has introduced a
131     command called pgrep for grepping around the active processes.
132    
133     7. Added the beginnings of support for UTF-8 character strings.
134    
135     8. Arranged for the Makefile to pass over the settings of CC, CFLAGS, and
136     RANLIB to ./ltconfig so that they are used by libtool. I think these are all
137     the relevant ones. (AR is not passed because ./ltconfig does its own figuring
138     out for the ar command.)
139    
140    
141 nigel 47 Version 3.2 12-May-00
142     ---------------------
143    
144     This is purely a bug fixing release.
145    
146     1. If the pattern /((Z)+|A)*/ was matched agained ZABCDEFG it matched Z instead
147     of ZA. This was just one example of several cases that could provoke this bug,
148     which was introduced by change 9 of version 2.00. The code for breaking
149     infinite loops after an iteration that matches an empty string was't working
150     correctly.
151    
152     2. The pcretest program was not imitating Perl correctly for the pattern /a*/g
153     when matched against abbab (for example). After matching an empty string, it
154     wasn't forcing anchoring when setting PCRE_NOTEMPTY for the next attempt; this
155     caused it to match further down the string than it should.
156    
157     3. The code contained an inclusion of sys/types.h. It isn't clear why this
158     was there because it doesn't seem to be needed, and it causes trouble on some
159     systems, as it is not a Standard C header. It has been removed.
160    
161     4. Made 4 silly changes to the source to avoid stupid compiler warnings that
162     were reported on the Macintosh. The changes were from
163    
164     while ((c = *(++ptr)) != 0 && c != '\n');
165     to
166     while ((c = *(++ptr)) != 0 && c != '\n') ;
167    
168     Totally extraordinary, but if that's what it takes...
169    
170     5. PCRE is being used in one environment where neither memmove() nor bcopy() is
171     available. Added HAVE_BCOPY and an autoconf test for it; if neither
172     HAVE_MEMMOVE nor HAVE_BCOPY is set, use a built-in emulation function which
173     assumes the way PCRE uses memmove() (always moving upwards).
174    
175     6. PCRE is being used in one environment where strchr() is not available. There
176     was only one use in pcre.c, and writing it out to avoid strchr() probably gives
177     faster code anyway.
178    
179    
180 nigel 45 Version 3.1 09-Feb-00
181     ---------------------
182    
183     The only change in this release is the fixing of some bugs in Makefile.in for
184     the "install" target:
185    
186     (1) It was failing to install pcreposix.h.
187    
188     (2) It was overwriting the pcre.3 man page with the pcreposix.3 man page.
189    
190    
191 nigel 43 Version 3.0 01-Feb-00
192     ---------------------
193 nigel 41
194     1. Add support for the /+ modifier to perltest (to output $` like it does in
195     pcretest).
196    
197     2. Add support for the /g modifier to perltest.
198    
199     3. Fix pcretest so that it behaves even more like Perl for /g when the pattern
200     matches null strings.
201    
202     4. Fix perltest so that it doesn't do unwanted things when fed an empty
203     pattern. Perl treats empty patterns specially - it reuses the most recent
204     pattern, which is not what we want. Replace // by /(?#)/ in order to avoid this
205     effect.
206    
207     5. The POSIX interface was broken in that it was just handing over the POSIX
208     captured string vector to pcre_exec(), but (since release 2.00) PCRE has
209     required a bigger vector, with some working space on the end. This means that
210     the POSIX wrapper now has to get and free some memory, and copy the results.
211    
212 nigel 43 6. Added some simple autoconf support, placing the test data and the
213     documentation in separate directories, re-organizing some of the
214     information files, and making it build pcre-config (a GNU standard). Also added
215     libtool support for building PCRE as a shared library, which is now the
216     default.
217 nigel 41
218 nigel 43 7. Got rid of the leading zero in the definition of PCRE_MINOR because 08 and
219     09 are not valid octal constants. Single digits will be used for minor values
220     less than 10.
221    
222     8. Defined REG_EXTENDED and REG_NOSUB as zero in the POSIX header, so that
223     existing programs that set these in the POSIX interface can use PCRE without
224     modification.
225    
226     9. Added a new function, pcre_fullinfo() with an extensible interface. It can
227     return all that pcre_info() returns, plus additional data. The pcre_info()
228     function is retained for compatibility, but is considered to be obsolete.
229    
230     10. Added experimental recursion feature (?R) to handle one common case that
231     Perl 5.6 will be able to do with (?p{...}).
232    
233     11. Added support for POSIX character classes like [:alpha:], which Perl is
234     adopting.
235    
236    
237 nigel 39 Version 2.08 31-Aug-99
238     ----------------------
239    
240     1. When startoffset was not zero and the pattern began with ".*", PCRE was not
241     trying to match at the startoffset position, but instead was moving forward to
242     the next newline as if a previous match had failed.
243    
244     2. pcretest was not making use of PCRE_NOTEMPTY when repeating for /g and /G,
245     and could get into a loop if a null string was matched other than at the start
246     of the subject.
247    
248     3. Added definitions of PCRE_MAJOR and PCRE_MINOR to pcre.h so the version can
249     be distinguished at compile time, and for completeness also added PCRE_DATE.
250    
251     5. Added Paul Sokolovsky's minor changes to make it easy to compile a Win32 DLL
252     in GnuWin32 environments.
253    
254    
255 nigel 37 Version 2.07 29-Jul-99
256     ----------------------
257    
258     1. The documentation is now supplied in plain text form and HTML as well as in
259     the form of man page sources.
260    
261     2. C++ compilers don't like assigning (void *) values to other pointer types.
262     In particular this affects malloc(). Although there is no problem in Standard
263     C, I've put in casts to keep C++ compilers happy.
264    
265     3. Typo on pcretest.c; a cast of (unsigned char *) in the POSIX regexec() call
266     should be (const char *).
267    
268     4. If NOPOSIX is defined, pcretest.c compiles without POSIX support. This may
269     be useful for non-Unix systems who don't want to bother with the POSIX stuff.
270     However, I haven't made this a standard facility. The documentation doesn't
271     mention it, and the Makefile doesn't support it.
272    
273     5. The Makefile now contains an "install" target, with editable destinations at
274     the top of the file. The pcretest program is not installed.
275    
276     6. pgrep -V now gives the PCRE version number and date.
277    
278     7. Fixed bug: a zero repetition after a literal string (e.g. /abcde{0}/) was
279     causing the entire string to be ignored, instead of just the last character.
280    
281     8. If a pattern like /"([^\\"]+|\\.)*"/ is applied in the normal way to a
282     non-matching string, it can take a very, very long time, even for strings of
283     quite modest length, because of the nested recursion. PCRE now does better in
284     some of these cases. It does this by remembering the last required literal
285     character in the pattern, and pre-searching the subject to ensure it is present
286     before running the real match. In other words, it applies a heuristic to detect
287     some types of certain failure quickly, and in the above example, if presented
288     with a string that has no trailing " it gives "no match" very quickly.
289    
290     9. A new runtime option PCRE_NOTEMPTY causes null string matches to be ignored;
291     other alternatives are tried instead.
292    
293    
294 nigel 35 Version 2.06 09-Jun-99
295     ----------------------
296    
297     1. Change pcretest's output for amount of store used to show just the code
298     space, because the remainder (the data block) varies in size between 32-bit and
299     64-bit systems.
300    
301     2. Added an extra argument to pcre_exec() to supply an offset in the subject to
302     start matching at. This allows lookbehinds to work when searching for multiple
303     occurrences in a string.
304    
305     3. Added additional options to pcretest for testing multiple occurrences:
306    
307     /+ outputs the rest of the string that follows a match
308     /g loops for multiple occurrences, using the new startoffset argument
309     /G loops for multiple occurrences by passing an incremented pointer
310    
311     4. PCRE wasn't doing the "first character" optimization for patterns starting
312     with \b or \B, though it was doing it for other lookbehind assertions. That is,
313     it wasn't noticing that a match for a pattern such as /\bxyz/ has to start with
314     the letter 'x'. On long subject strings, this gives a significant speed-up.
315    
316    
317 nigel 33 Version 2.05 21-Apr-99
318     ----------------------
319    
320     1. Changed the type of magic_number from int to long int so that it works
321     properly on 16-bit systems.
322    
323     2. Fixed a bug which caused patterns starting with .* not to work correctly
324     when the subject string contained newline characters. PCRE was assuming
325     anchoring for such patterns in all cases, which is not correct because .* will
326     not pass a newline unless PCRE_DOTALL is set. It now assumes anchoring only if
327     DOTALL is set at top level; otherwise it knows that patterns starting with .*
328     must be retried after every newline in the subject.
329    
330    
331 nigel 31 Version 2.04 18-Feb-99
332     ----------------------
333    
334     1. For parenthesized subpatterns with repeats whose minimum was zero, the
335     computation of the store needed to hold the pattern was incorrect (too large).
336     If such patterns were nested a few deep, this could multiply and become a real
337     problem.
338    
339     2. Added /M option to pcretest to show the memory requirement of a specific
340     pattern. Made -m a synonym of -s (which does this globally) for compatibility.
341    
342     3. Subpatterns of the form (regex){n,m} (i.e. limited maximum) were being
343     compiled in such a way that the backtracking after subsequent failure was
344     pessimal. Something like (a){0,3} was compiled as (a)?(a)?(a)? instead of
345     ((a)((a)(a)?)?)? with disastrous performance if the maximum was of any size.
346    
347    
348 nigel 29 Version 2.03 02-Feb-99
349     ----------------------
350    
351     1. Fixed typo and small mistake in man page.
352    
353 nigel 31 2. Added 4th condition (GPL supersedes if conflict) and created separate
354     LICENCE file containing the conditions.
355 nigel 29
356     3. Updated pcretest so that patterns such as /abc\/def/ work like they do in
357     Perl, that is the internal \ allows the delimiter to be included in the
358     pattern. Locked out the use of \ as a delimiter. If \ immediately follows
359     the final delimiter, add \ to the end of the pattern (to test the error).
360    
361     4. Added the convenience functions for extracting substrings after a successful
362     match. Updated pcretest to make it able to test these functions.
363    
364    
365 nigel 27 Version 2.02 14-Jan-99
366     ----------------------
367    
368     1. Initialized the working variables associated with each extraction so that
369     their saving and restoring doesn't refer to uninitialized store.
370    
371     2. Put dummy code into study.c in order to trick the optimizer of the IBM C
372     compiler for OS/2 into generating correct code. Apparently IBM isn't going to
373     fix the problem.
374    
375     3. Pcretest: the timing code wasn't using LOOPREPEAT for timing execution
376     calls, and wasn't printing the correct value for compiling calls. Increased the
377     default value of LOOPREPEAT, and the number of significant figures in the
378     times.
379    
380     4. Changed "/bin/rm" in the Makefile to "-rm" so it works on Windows NT.
381    
382     5. Renamed "deftables" as "dftables" to get it down to 8 characters, to avoid
383     a building problem on Windows NT with a FAT file system.
384    
385    
386 nigel 25 Version 2.01 21-Oct-98
387     ----------------------
388    
389     1. Changed the API for pcre_compile() to allow for the provision of a pointer
390     to character tables built by pcre_maketables() in the current locale. If NULL
391     is passed, the default tables are used.
392    
393    
394 nigel 23 Version 2.00 24-Sep-98
395 nigel 21 ----------------------
396    
397 nigel 23 1. Since the (>?) facility is in Perl 5.005, don't require PCRE_EXTRA to enable
398     it any more.
399    
400     2. Allow quantification of (?>) groups, and make it work correctly.
401    
402     3. The first character computation wasn't working for (?>) groups.
403    
404     4. Correct the implementation of \Z (it is permitted to match on the \n at the
405     end of the subject) and add 5.005's \z, which really does match only at the
406     very end of the subject.
407    
408     5. Remove the \X "cut" facility; Perl doesn't have it, and (?> is neater.
409    
410     6. Remove the ability to specify CASELESS, MULTILINE, DOTALL, and
411     DOLLAR_END_ONLY at runtime, to make it possible to implement the Perl 5.005
412     localized options. All options to pcre_study() were also removed.
413    
414     7. Add other new features from 5.005:
415    
416     $(?<= positive lookbehind
417     $(?<! negative lookbehind
418     (?imsx-imsx) added the unsetting capability
419     such a setting is global if at outer level; local otherwise
420     (?imsx-imsx:) non-capturing groups with option setting
421     (?(cond)re|re) conditional pattern matching
422    
423     A backreference to itself in a repeated group matches the previous
424     captured string.
425    
426     8. General tidying up of studying (both automatic and via "study")
427     consequential on the addition of new assertions.
428    
429     9. As in 5.005, unlimited repeated groups that could match an empty substring
430     are no longer faulted at compile time. Instead, the loop is forcibly broken at
431     runtime if any iteration does actually match an empty substring.
432    
433     10. Include the RunTest script in the distribution.
434    
435     11. Added tests from the Perl 5.005_02 distribution. This showed up a few
436     discrepancies, some of which were old and were also with respect to 5.004. They
437     have now been fixed.
438    
439    
440     Version 1.09 28-Apr-98
441     ----------------------
442    
443 nigel 21 1. A negated single character class followed by a quantifier with a minimum
444     value of one (e.g. [^x]{1,6} ) was not compiled correctly. This could lead to
445     program crashes, or just wrong answers. This did not apply to negated classes
446     containing more than one character, or to minima other than one.
447    
448    
449 nigel 19 Version 1.08 27-Mar-98
450     ----------------------
451    
452     1. Add PCRE_UNGREEDY to invert the greediness of quantifiers.
453    
454     2. Add (?U) and (?X) to set PCRE_UNGREEDY and PCRE_EXTRA respectively. The
455     latter must appear before anything that relies on it in the pattern.
456    
457    
458 nigel 17 Version 1.07 16-Feb-98
459     ----------------------
460    
461     1. A pattern such as /((a)*)*/ was not being diagnosed as in error (unlimited
462     repeat of a potentially empty string).
463    
464    
465 nigel 15 Version 1.06 23-Jan-98
466     ----------------------
467    
468     1. Added Markus Oberhumer's little patches for C++.
469    
470     2. Literal strings longer than 255 characters were broken.
471    
472    
473 nigel 13 Version 1.05 23-Dec-97
474     ----------------------
475    
476     1. Negated character classes containing more than one character were failing if
477     PCRE_CASELESS was set at run time.
478    
479    
480 nigel 11 Version 1.04 19-Dec-97
481     ----------------------
482    
483     1. Corrected the man page, where some "const" qualifiers had been omitted.
484    
485     2. Made debugging output print "{0,xxx}" instead of just "{,xxx}" to agree with
486     input syntax.
487    
488     3. Fixed memory leak which occurred when a regex with back references was
489     matched with an offsets vector that wasn't big enough. The temporary memory
490     that is used in this case wasn't being freed if the match failed.
491    
492     4. Tidied pcretest to ensure it frees memory that it gets.
493    
494     5. Temporary memory was being obtained in the case where the passed offsets
495     vector was exactly big enough.
496    
497     6. Corrected definition of offsetof() from change 5 below.
498    
499     7. I had screwed up change 6 below and broken the rules for the use of
500     setjmp(). Now fixed.
501    
502    
503 nigel 9 Version 1.03 18-Dec-97
504     ----------------------
505    
506     1. A erroneous regex with a missing opening parenthesis was correctly
507     diagnosed, but PCRE attempted to access brastack[-1], which could cause crashes
508     on some systems.
509    
510     2. Replaced offsetof(real_pcre, code) by offsetof(real_pcre, code[0]) because
511     it was reported that one broken compiler failed on the former because "code" is
512     also an independent variable.
513    
514     3. The erroneous regex a[]b caused an array overrun reference.
515    
516     4. A regex ending with a one-character negative class (e.g. /[^k]$/) did not
517     fail on data ending with that character. (It was going on too far, and checking
518     the next character, typically a binary zero.) This was specific to the
519     optimized code for single-character negative classes.
520    
521     5. Added a contributed patch from the TIN world which does the following:
522    
523     + Add an undef for memmove, in case the the system defines a macro for it.
524    
525     + Add a definition of offsetof(), in case there isn't one. (I don't know
526     the reason behind this - offsetof() is part of the ANSI standard - but
527     it does no harm).
528    
529     + Reduce the ifdef's in pcre.c using macro DPRINTF, thereby eliminating
530     most of the places where whitespace preceded '#'. I have given up and
531     allowed the remaining 2 cases to be at the margin.
532    
533     + Rename some variables in pcre to eliminate shadowing. This seems very
534     pedantic, but does no harm, of course.
535    
536     6. Moved the call to setjmp() into its own function, to get rid of warnings
537     from gcc -Wall, and avoided calling it at all unless PCRE_EXTRA is used.
538    
539     7. Constructs such as \d{8,} were compiling into the equivalent of
540 nigel 11 \d{8}\d{0,65527} instead of \d{8}\d* which didn't make much difference to the
541 nigel 9 outcome, but in this particular case used more store than had been allocated,
542     which caused the bug to be discovered because it threw up an internal error.
543    
544     8. The debugging code in both pcre and pcretest for outputting the compiled
545     form of a regex was going wrong in the case of back references followed by
546     curly-bracketed repeats.
547    
548    
549 nigel 7 Version 1.02 12-Dec-97
550     ----------------------
551    
552     1. Typos in pcre.3 and comments in the source fixed.
553    
554     2. Applied a contributed patch to get rid of places where it used to remove
555     'const' from variables, and fixed some signed/unsigned and uninitialized
556     variable warnings.
557    
558     3. Added the "runtest" target to Makefile.
559    
560     4. Set default compiler flag to -O2 rather than just -O.
561    
562    
563 nigel 5 Version 1.01 19-Nov-97
564     ----------------------
565    
566     1. PCRE was failing to diagnose unlimited repeat of empty string for patterns
567     like /([ab]*)*/, that is, for classes with more than one character in them.
568    
569     2. Likewise, it wasn't diagnosing patterns with "once-only" subpatterns, such
570     as /((?>a*))*/ (a PCRE_EXTRA facility).
571    
572    
573     Version 1.00 18-Nov-97
574     ----------------------
575    
576     1. Added compile-time macros to support systems such as SunOS4 which don't have
577     memmove() or strerror() but have other things that can be used instead.
578    
579     2. Arranged that "make clean" removes the executables.
580    
581    
582 nigel 3 Version 0.99 27-Oct-97
583     ----------------------
584    
585     1. Fixed bug in code for optimizing classes with only one character. It was
586     initializing a 32-byte map regardless, which could cause it to run off the end
587     of the memory it had got.
588    
589     2. Added, conditional on PCRE_EXTRA, the proposed (?>REGEX) construction.
590    
591    
592     Version 0.98 22-Oct-97
593     ----------------------
594    
595     1. Fixed bug in code for handling temporary memory usage when there are more
596     back references than supplied space in the ovector. This could cause segfaults.
597    
598    
599     Version 0.97 21-Oct-97
600     ----------------------
601    
602     1. Added the \X "cut" facility, conditional on PCRE_EXTRA.
603    
604     2. Optimized negated single characters not to use a bit map.
605    
606     3. Brought error texts together as macro definitions; clarified some of them;
607     fixed one that was wrong - it said "range out of order" when it meant "invalid
608     escape sequence".
609    
610     4. Changed some char * arguments to const char *.
611    
612     5. Added PCRE_NOTBOL and PCRE_NOTEOL (from POSIX).
613    
614     6. Added the POSIX-style API wrapper in pcreposix.a and testing facilities in
615     pcretest.
616    
617    
618     Version 0.96 16-Oct-97
619     ----------------------
620    
621     1. Added a simple "pgrep" utility to the distribution.
622    
623     2. Fixed an incompatibility with Perl: "{" is now treated as a normal character
624     unless it appears in one of the precise forms "{ddd}", "{ddd,}", or "{ddd,ddd}"
625     where "ddd" means "one or more decimal digits".
626    
627     3. Fixed serious bug. If a pattern had a back reference, but the call to
628     pcre_exec() didn't supply a large enough ovector to record the related
629     identifying subpattern, the match always failed. PCRE now remembers the number
630     of the largest back reference, and gets some temporary memory in which to save
631     the offsets during matching if necessary, in order to ensure that
632     backreferences always work.
633    
634     4. Increased the compatibility with Perl in a number of ways:
635    
636     (a) . no longer matches \n by default; an option PCRE_DOTALL is provided
637     to request this handling. The option can be set at compile or exec time.
638    
639     (b) $ matches before a terminating newline by default; an option
640     PCRE_DOLLAR_ENDONLY is provided to override this (but not in multiline
641     mode). The option can be set at compile or exec time.
642    
643     (c) The handling of \ followed by a digit other than 0 is now supposed to be
644     the same as Perl's. If the decimal number it represents is less than 10
645     or there aren't that many previous left capturing parentheses, an octal
646     escape is read. Inside a character class, it's always an octal escape,
647     even if it is a single digit.
648    
649     (d) An escaped but undefined alphabetic character is taken as a literal,
650     unless PCRE_EXTRA is set. Currently this just reserves the remaining
651     escapes.
652    
653     (e) {0} is now permitted. (The previous item is removed from the compiled
654     pattern).
655    
656     5. Changed all the names of code files so that the basic parts are no longer
657     than 10 characters, and abolished the teeny "globals.c" file.
658    
659     6. Changed the handling of character classes; they are now done with a 32-byte
660     bit map always.
661    
662     7. Added the -d and /D options to pcretest to make it possible to look at the
663     internals of compilation without having to recompile pcre.
664    
665    
666     Version 0.95 23-Sep-97
667     ----------------------
668    
669     1. Fixed bug in pre-pass concerning escaped "normal" characters such as \x5c or
670     \x20 at the start of a run of normal characters. These were being treated as
671     real characters, instead of the source characters being re-checked.
672    
673    
674     Version 0.94 18-Sep-97
675     ----------------------
676    
677     1. The functions are now thread-safe, with the caveat that the global variables
678     containing pointers to malloc() and free() or alternative functions are the
679     same for all threads.
680    
681     2. Get pcre_study() to generate a bitmap of initial characters for non-
682     anchored patterns when this is possible, and use it if passed to pcre_exec().
683    
684    
685     Version 0.93 15-Sep-97
686     ----------------------
687    
688     1. /(b)|(:+)/ was computing an incorrect first character.
689    
690     2. Add pcre_study() to the API and the passing of pcre_extra to pcre_exec(),
691     but not actually doing anything yet.
692    
693     3. Treat "-" characters in classes that cannot be part of ranges as literals,
694     as Perl does (e.g. [-az] or [az-]).
695    
696     4. Set the anchored flag if a branch starts with .* or .*? because that tests
697     all possible positions.
698    
699     5. Split up into different modules to avoid including unneeded functions in a
700     compiled binary. However, compile and exec are still in one module. The "study"
701     function is split off.
702    
703     6. The character tables are now in a separate module whose source is generated
704     by an auxiliary program - but can then be edited by hand if required. There are
705     now no calls to isalnum(), isspace(), isdigit(), isxdigit(), tolower() or
706     toupper() in the code.
707    
708     7. Turn the malloc/free funtions variables into pcre_malloc and pcre_free and
709     make them global. Abolish the function for setting them, as the caller can now
710     set them directly.
711    
712    
713     Version 0.92 11-Sep-97
714     ----------------------
715    
716     1. A repeat with a fixed maximum and a minimum of 1 for an ordinary character
717     (e.g. /a{1,3}/) was broken (I mis-optimized it).
718    
719     2. Caseless matching was not working in character classes if the characters in
720     the pattern were in upper case.
721    
722     3. Make ranges like [W-c] work in the same way as Perl for caseless matching.
723    
724     4. Make PCRE_ANCHORED public and accept as a compile option.
725    
726     5. Add an options word to pcre_exec() and accept PCRE_ANCHORED and
727     PCRE_CASELESS at run time. Add escapes \A and \I to pcretest to cause it to
728     pass them.
729    
730     6. Give an error if bad option bits passed at compile or run time.
731    
732     7. Add PCRE_MULTILINE at compile and exec time, and (?m) as well. Add \M to
733     pcretest to cause it to pass that flag.
734    
735     8. Add pcre_info(), to get the number of identifying subpatterns, the stored
736     options, and the first character, if set.
737    
738     9. Recognize C+ or C{n,m} where n >= 1 as providing a fixed starting character.
739    
740    
741     Version 0.91 10-Sep-97
742     ----------------------
743    
744     1. PCRE was failing to diagnose unlimited repeats of subpatterns that could
745     match the empty string as in /(a*)*/. It was looping and ultimately crashing.
746    
747     2. PCRE was looping on encountering an indefinitely repeated back reference to
748     a subpattern that had matched an empty string, e.g. /(a|)\1*/. It now does what
749     Perl does - treats the match as successful.
750    
751     ****

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