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

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