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Revision 57 - (show annotations) (download)
Sat Feb 24 21:39:50 2007 UTC (7 years, 7 months ago) by nigel
File size: 27843 byte(s)
Load pcre-3.7 into code/trunk.

1 ChangeLog for PCRE
2 ------------------
3
4 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 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 Version 3.5 15-Aug-01
23 ---------------------
24
25 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 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 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 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 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 Version 3.0 01-Feb-00
170 ---------------------
171
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 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
196 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 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 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 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 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 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 Version 2.03 02-Feb-99
327 ----------------------
328
329 1. Fixed typo and small mistake in man page.
330
331 2. Added 4th condition (GPL supersedes if conflict) and created separate
332 LICENCE file containing the conditions.
333
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 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 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 Version 2.00 24-Sep-98
373 ----------------------
374
375 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 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 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 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 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 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 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 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 \d{8}\d{0,65527} instead of \d{8}\d* which didn't make much difference to the
519 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 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 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 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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