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Revision 55 - (hide annotations) (download)
Sat Feb 24 21:39:46 2007 UTC (7 years, 4 months ago) by nigel
File size: 27580 byte(s)
Load pcre-3.6 into code/trunk.

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

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