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Load pcre-3.8 into code/trunk.

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

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