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Revision 53 - (hide annotations) (download)
Sat Feb 24 21:39:42 2007 UTC (7 years, 2 months ago) by nigel
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Load pcre-3.5 into code/trunk.

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

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