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Revision 61 - (show annotations) (download)
Sat Feb 24 21:39:58 2007 UTC (7 years, 7 months ago) by nigel
File size: 28648 byte(s)
Load pcre-3.9 into code/trunk.

1 ChangeLog for PCRE
2 ------------------
3
4 Version 3.0 02-Jan-02
5 ---------------------
6
7 1. A bit of extraneous text had somehow crept into the pcregrep documentation.
8
9 2. If --disable-static was given, the building process failed when trying to
10 build pcretest and pcregrep. (For some reason it was using libtool to compile
11 them, which is not right, as they aren't part of the library.)
12
13
14 Version 3.8 18-Dec-01
15 ---------------------
16
17 1. The experimental UTF-8 code was completely screwed up. It was packing the
18 bytes in the wrong order. How dumb can you get?
19
20
21 Version 3.7 29-Oct-01
22 ---------------------
23
24 1. In updating pcretest to check change 1 of version 3.6, I screwed up.
25 This caused pcretest, when used on the test data, to segfault. Unfortunately,
26 this didn't happen under Solaris 8, where I normally test things.
27
28 2. The Makefile had to be changed to make it work on BSD systems, where 'make'
29 doesn't seem to recognize that ./xxx and xxx are the same file. (This entry
30 isn't in ChangeLog distributed with 3.7 because I forgot when I hastily made
31 this fix an hour or so after the initial 3.7 release.)
32
33
34 Version 3.6 23-Oct-01
35 ---------------------
36
37 1. Crashed with /(sens|respons)e and \1ibility/ and "sense and sensibility" if
38 offsets passed as NULL with zero offset count.
39
40 2. The config.guess and config.sub files had not been updated when I moved to
41 the latest autoconf.
42
43
44 Version 3.5 15-Aug-01
45 ---------------------
46
47 1. Added some missing #if !defined NOPOSIX conditionals in pcretest.c that
48 had been forgotten.
49
50 2. By using declared but undefined structures, we can avoid using "void"
51 definitions in pcre.h while keeping the internal definitions of the structures
52 private.
53
54 3. The distribution is now built using autoconf 2.50 and libtool 1.4. From a
55 user point of view, this means that both static and shared libraries are built
56 by default, but this can be individually controlled. More of the work of
57 handling this static/shared cases is now inside libtool instead of PCRE's make
58 file.
59
60 4. The pcretest utility is now installed along with pcregrep because it is
61 useful for users (to test regexs) and by doing this, it automatically gets
62 relinked by libtool. The documentation has been turned into a man page, so
63 there are now .1, .txt, and .html versions in /doc.
64
65 5. Upgrades to pcregrep:
66 (i) Added long-form option names like gnu grep.
67 (ii) Added --help to list all options with an explanatory phrase.
68 (iii) Added -r, --recursive to recurse into sub-directories.
69 (iv) Added -f, --file to read patterns from a file.
70
71 6. pcre_exec() was referring to its "code" argument before testing that
72 argument for NULL (and giving an error if it was NULL).
73
74 7. Upgraded Makefile.in to allow for compiling in a different directory from
75 the source directory.
76
77 8. Tiny buglet in pcretest: when pcre_fullinfo() was called to retrieve the
78 options bits, the pointer it was passed was to an int instead of to an unsigned
79 long int. This mattered only on 64-bit systems.
80
81 9. Fixed typo (3.4/1) in pcre.h again. Sigh. I had changed pcre.h (which is
82 generated) instead of pcre.in, which it its source. Also made the same change
83 in several of the .c files.
84
85 10. A new release of gcc defines printf() as a macro, which broke pcretest
86 because it had an ifdef in the middle of a string argument for printf(). Fixed
87 by using separate calls to printf().
88
89 11. Added --enable-newline-is-cr and --enable-newline-is-lf to the configure
90 script, to force use of CR or LF instead of \n in the source. On non-Unix
91 systems, the value can be set in config.h.
92
93 12. The limit of 200 on non-capturing parentheses is a _nesting_ limit, not an
94 absolute limit. Changed the text of the error message to make this clear, and
95 likewise updated the man page.
96
97 13. The limit of 99 on the number of capturing subpatterns has been removed.
98 The new limit is 65535, which I hope will not be a "real" limit.
99
100
101 Version 3.4 22-Aug-00
102 ---------------------
103
104 1. Fixed typo in pcre.h: unsigned const char * changed to const unsigned char *.
105
106 2. Diagnose condition (?(0) as an error instead of crashing on matching.
107
108
109 Version 3.3 01-Aug-00
110 ---------------------
111
112 1. If an octal character was given, but the value was greater than \377, it
113 was not getting masked to the least significant bits, as documented. This could
114 lead to crashes in some systems.
115
116 2. Perl 5.6 (if not earlier versions) accepts classes like [a-\d] and treats
117 the hyphen as a literal. PCRE used to give an error; it now behaves like Perl.
118
119 3. Added the functions pcre_free_substring() and pcre_free_substring_list().
120 These just pass their arguments on to (pcre_free)(), but they are provided
121 because some uses of PCRE bind it to non-C systems that can call its functions,
122 but cannot call free() or pcre_free() directly.
123
124 4. Add "make test" as a synonym for "make check". Corrected some comments in
125 the Makefile.
126
127 5. Add $(DESTDIR)/ in front of all the paths in the "install" target in the
128 Makefile.
129
130 6. Changed the name of pgrep to pcregrep, because Solaris has introduced a
131 command called pgrep for grepping around the active processes.
132
133 7. Added the beginnings of support for UTF-8 character strings.
134
135 8. Arranged for the Makefile to pass over the settings of CC, CFLAGS, and
136 RANLIB to ./ltconfig so that they are used by libtool. I think these are all
137 the relevant ones. (AR is not passed because ./ltconfig does its own figuring
138 out for the ar command.)
139
140
141 Version 3.2 12-May-00
142 ---------------------
143
144 This is purely a bug fixing release.
145
146 1. If the pattern /((Z)+|A)*/ was matched agained ZABCDEFG it matched Z instead
147 of ZA. This was just one example of several cases that could provoke this bug,
148 which was introduced by change 9 of version 2.00. The code for breaking
149 infinite loops after an iteration that matches an empty string was't working
150 correctly.
151
152 2. The pcretest program was not imitating Perl correctly for the pattern /a*/g
153 when matched against abbab (for example). After matching an empty string, it
154 wasn't forcing anchoring when setting PCRE_NOTEMPTY for the next attempt; this
155 caused it to match further down the string than it should.
156
157 3. The code contained an inclusion of sys/types.h. It isn't clear why this
158 was there because it doesn't seem to be needed, and it causes trouble on some
159 systems, as it is not a Standard C header. It has been removed.
160
161 4. Made 4 silly changes to the source to avoid stupid compiler warnings that
162 were reported on the Macintosh. The changes were from
163
164 while ((c = *(++ptr)) != 0 && c != '\n');
165 to
166 while ((c = *(++ptr)) != 0 && c != '\n') ;
167
168 Totally extraordinary, but if that's what it takes...
169
170 5. PCRE is being used in one environment where neither memmove() nor bcopy() is
171 available. Added HAVE_BCOPY and an autoconf test for it; if neither
172 HAVE_MEMMOVE nor HAVE_BCOPY is set, use a built-in emulation function which
173 assumes the way PCRE uses memmove() (always moving upwards).
174
175 6. PCRE is being used in one environment where strchr() is not available. There
176 was only one use in pcre.c, and writing it out to avoid strchr() probably gives
177 faster code anyway.
178
179
180 Version 3.1 09-Feb-00
181 ---------------------
182
183 The only change in this release is the fixing of some bugs in Makefile.in for
184 the "install" target:
185
186 (1) It was failing to install pcreposix.h.
187
188 (2) It was overwriting the pcre.3 man page with the pcreposix.3 man page.
189
190
191 Version 3.0 01-Feb-00
192 ---------------------
193
194 1. Add support for the /+ modifier to perltest (to output $` like it does in
195 pcretest).
196
197 2. Add support for the /g modifier to perltest.
198
199 3. Fix pcretest so that it behaves even more like Perl for /g when the pattern
200 matches null strings.
201
202 4. Fix perltest so that it doesn't do unwanted things when fed an empty
203 pattern. Perl treats empty patterns specially - it reuses the most recent
204 pattern, which is not what we want. Replace // by /(?#)/ in order to avoid this
205 effect.
206
207 5. The POSIX interface was broken in that it was just handing over the POSIX
208 captured string vector to pcre_exec(), but (since release 2.00) PCRE has
209 required a bigger vector, with some working space on the end. This means that
210 the POSIX wrapper now has to get and free some memory, and copy the results.
211
212 6. Added some simple autoconf support, placing the test data and the
213 documentation in separate directories, re-organizing some of the
214 information files, and making it build pcre-config (a GNU standard). Also added
215 libtool support for building PCRE as a shared library, which is now the
216 default.
217
218 7. Got rid of the leading zero in the definition of PCRE_MINOR because 08 and
219 09 are not valid octal constants. Single digits will be used for minor values
220 less than 10.
221
222 8. Defined REG_EXTENDED and REG_NOSUB as zero in the POSIX header, so that
223 existing programs that set these in the POSIX interface can use PCRE without
224 modification.
225
226 9. Added a new function, pcre_fullinfo() with an extensible interface. It can
227 return all that pcre_info() returns, plus additional data. The pcre_info()
228 function is retained for compatibility, but is considered to be obsolete.
229
230 10. Added experimental recursion feature (?R) to handle one common case that
231 Perl 5.6 will be able to do with (?p{...}).
232
233 11. Added support for POSIX character classes like [:alpha:], which Perl is
234 adopting.
235
236
237 Version 2.08 31-Aug-99
238 ----------------------
239
240 1. When startoffset was not zero and the pattern began with ".*", PCRE was not
241 trying to match at the startoffset position, but instead was moving forward to
242 the next newline as if a previous match had failed.
243
244 2. pcretest was not making use of PCRE_NOTEMPTY when repeating for /g and /G,
245 and could get into a loop if a null string was matched other than at the start
246 of the subject.
247
248 3. Added definitions of PCRE_MAJOR and PCRE_MINOR to pcre.h so the version can
249 be distinguished at compile time, and for completeness also added PCRE_DATE.
250
251 5. Added Paul Sokolovsky's minor changes to make it easy to compile a Win32 DLL
252 in GnuWin32 environments.
253
254
255 Version 2.07 29-Jul-99
256 ----------------------
257
258 1. The documentation is now supplied in plain text form and HTML as well as in
259 the form of man page sources.
260
261 2. C++ compilers don't like assigning (void *) values to other pointer types.
262 In particular this affects malloc(). Although there is no problem in Standard
263 C, I've put in casts to keep C++ compilers happy.
264
265 3. Typo on pcretest.c; a cast of (unsigned char *) in the POSIX regexec() call
266 should be (const char *).
267
268 4. If NOPOSIX is defined, pcretest.c compiles without POSIX support. This may
269 be useful for non-Unix systems who don't want to bother with the POSIX stuff.
270 However, I haven't made this a standard facility. The documentation doesn't
271 mention it, and the Makefile doesn't support it.
272
273 5. The Makefile now contains an "install" target, with editable destinations at
274 the top of the file. The pcretest program is not installed.
275
276 6. pgrep -V now gives the PCRE version number and date.
277
278 7. Fixed bug: a zero repetition after a literal string (e.g. /abcde{0}/) was
279 causing the entire string to be ignored, instead of just the last character.
280
281 8. If a pattern like /"([^\\"]+|\\.)*"/ is applied in the normal way to a
282 non-matching string, it can take a very, very long time, even for strings of
283 quite modest length, because of the nested recursion. PCRE now does better in
284 some of these cases. It does this by remembering the last required literal
285 character in the pattern, and pre-searching the subject to ensure it is present
286 before running the real match. In other words, it applies a heuristic to detect
287 some types of certain failure quickly, and in the above example, if presented
288 with a string that has no trailing " it gives "no match" very quickly.
289
290 9. A new runtime option PCRE_NOTEMPTY causes null string matches to be ignored;
291 other alternatives are tried instead.
292
293
294 Version 2.06 09-Jun-99
295 ----------------------
296
297 1. Change pcretest's output for amount of store used to show just the code
298 space, because the remainder (the data block) varies in size between 32-bit and
299 64-bit systems.
300
301 2. Added an extra argument to pcre_exec() to supply an offset in the subject to
302 start matching at. This allows lookbehinds to work when searching for multiple
303 occurrences in a string.
304
305 3. Added additional options to pcretest for testing multiple occurrences:
306
307 /+ outputs the rest of the string that follows a match
308 /g loops for multiple occurrences, using the new startoffset argument
309 /G loops for multiple occurrences by passing an incremented pointer
310
311 4. PCRE wasn't doing the "first character" optimization for patterns starting
312 with \b or \B, though it was doing it for other lookbehind assertions. That is,
313 it wasn't noticing that a match for a pattern such as /\bxyz/ has to start with
314 the letter 'x'. On long subject strings, this gives a significant speed-up.
315
316
317 Version 2.05 21-Apr-99
318 ----------------------
319
320 1. Changed the type of magic_number from int to long int so that it works
321 properly on 16-bit systems.
322
323 2. Fixed a bug which caused patterns starting with .* not to work correctly
324 when the subject string contained newline characters. PCRE was assuming
325 anchoring for such patterns in all cases, which is not correct because .* will
326 not pass a newline unless PCRE_DOTALL is set. It now assumes anchoring only if
327 DOTALL is set at top level; otherwise it knows that patterns starting with .*
328 must be retried after every newline in the subject.
329
330
331 Version 2.04 18-Feb-99
332 ----------------------
333
334 1. For parenthesized subpatterns with repeats whose minimum was zero, the
335 computation of the store needed to hold the pattern was incorrect (too large).
336 If such patterns were nested a few deep, this could multiply and become a real
337 problem.
338
339 2. Added /M option to pcretest to show the memory requirement of a specific
340 pattern. Made -m a synonym of -s (which does this globally) for compatibility.
341
342 3. Subpatterns of the form (regex){n,m} (i.e. limited maximum) were being
343 compiled in such a way that the backtracking after subsequent failure was
344 pessimal. Something like (a){0,3} was compiled as (a)?(a)?(a)? instead of
345 ((a)((a)(a)?)?)? with disastrous performance if the maximum was of any size.
346
347
348 Version 2.03 02-Feb-99
349 ----------------------
350
351 1. Fixed typo and small mistake in man page.
352
353 2. Added 4th condition (GPL supersedes if conflict) and created separate
354 LICENCE file containing the conditions.
355
356 3. Updated pcretest so that patterns such as /abc\/def/ work like they do in
357 Perl, that is the internal \ allows the delimiter to be included in the
358 pattern. Locked out the use of \ as a delimiter. If \ immediately follows
359 the final delimiter, add \ to the end of the pattern (to test the error).
360
361 4. Added the convenience functions for extracting substrings after a successful
362 match. Updated pcretest to make it able to test these functions.
363
364
365 Version 2.02 14-Jan-99
366 ----------------------
367
368 1. Initialized the working variables associated with each extraction so that
369 their saving and restoring doesn't refer to uninitialized store.
370
371 2. Put dummy code into study.c in order to trick the optimizer of the IBM C
372 compiler for OS/2 into generating correct code. Apparently IBM isn't going to
373 fix the problem.
374
375 3. Pcretest: the timing code wasn't using LOOPREPEAT for timing execution
376 calls, and wasn't printing the correct value for compiling calls. Increased the
377 default value of LOOPREPEAT, and the number of significant figures in the
378 times.
379
380 4. Changed "/bin/rm" in the Makefile to "-rm" so it works on Windows NT.
381
382 5. Renamed "deftables" as "dftables" to get it down to 8 characters, to avoid
383 a building problem on Windows NT with a FAT file system.
384
385
386 Version 2.01 21-Oct-98
387 ----------------------
388
389 1. Changed the API for pcre_compile() to allow for the provision of a pointer
390 to character tables built by pcre_maketables() in the current locale. If NULL
391 is passed, the default tables are used.
392
393
394 Version 2.00 24-Sep-98
395 ----------------------
396
397 1. Since the (>?) facility is in Perl 5.005, don't require PCRE_EXTRA to enable
398 it any more.
399
400 2. Allow quantification of (?>) groups, and make it work correctly.
401
402 3. The first character computation wasn't working for (?>) groups.
403
404 4. Correct the implementation of \Z (it is permitted to match on the \n at the
405 end of the subject) and add 5.005's \z, which really does match only at the
406 very end of the subject.
407
408 5. Remove the \X "cut" facility; Perl doesn't have it, and (?> is neater.
409
410 6. Remove the ability to specify CASELESS, MULTILINE, DOTALL, and
411 DOLLAR_END_ONLY at runtime, to make it possible to implement the Perl 5.005
412 localized options. All options to pcre_study() were also removed.
413
414 7. Add other new features from 5.005:
415
416 $(?<= positive lookbehind
417 $(?<! negative lookbehind
418 (?imsx-imsx) added the unsetting capability
419 such a setting is global if at outer level; local otherwise
420 (?imsx-imsx:) non-capturing groups with option setting
421 (?(cond)re|re) conditional pattern matching
422
423 A backreference to itself in a repeated group matches the previous
424 captured string.
425
426 8. General tidying up of studying (both automatic and via "study")
427 consequential on the addition of new assertions.
428
429 9. As in 5.005, unlimited repeated groups that could match an empty substring
430 are no longer faulted at compile time. Instead, the loop is forcibly broken at
431 runtime if any iteration does actually match an empty substring.
432
433 10. Include the RunTest script in the distribution.
434
435 11. Added tests from the Perl 5.005_02 distribution. This showed up a few
436 discrepancies, some of which were old and were also with respect to 5.004. They
437 have now been fixed.
438
439
440 Version 1.09 28-Apr-98
441 ----------------------
442
443 1. A negated single character class followed by a quantifier with a minimum
444 value of one (e.g. [^x]{1,6} ) was not compiled correctly. This could lead to
445 program crashes, or just wrong answers. This did not apply to negated classes
446 containing more than one character, or to minima other than one.
447
448
449 Version 1.08 27-Mar-98
450 ----------------------
451
452 1. Add PCRE_UNGREEDY to invert the greediness of quantifiers.
453
454 2. Add (?U) and (?X) to set PCRE_UNGREEDY and PCRE_EXTRA respectively. The
455 latter must appear before anything that relies on it in the pattern.
456
457
458 Version 1.07 16-Feb-98
459 ----------------------
460
461 1. A pattern such as /((a)*)*/ was not being diagnosed as in error (unlimited
462 repeat of a potentially empty string).
463
464
465 Version 1.06 23-Jan-98
466 ----------------------
467
468 1. Added Markus Oberhumer's little patches for C++.
469
470 2. Literal strings longer than 255 characters were broken.
471
472
473 Version 1.05 23-Dec-97
474 ----------------------
475
476 1. Negated character classes containing more than one character were failing if
477 PCRE_CASELESS was set at run time.
478
479
480 Version 1.04 19-Dec-97
481 ----------------------
482
483 1. Corrected the man page, where some "const" qualifiers had been omitted.
484
485 2. Made debugging output print "{0,xxx}" instead of just "{,xxx}" to agree with
486 input syntax.
487
488 3. Fixed memory leak which occurred when a regex with back references was
489 matched with an offsets vector that wasn't big enough. The temporary memory
490 that is used in this case wasn't being freed if the match failed.
491
492 4. Tidied pcretest to ensure it frees memory that it gets.
493
494 5. Temporary memory was being obtained in the case where the passed offsets
495 vector was exactly big enough.
496
497 6. Corrected definition of offsetof() from change 5 below.
498
499 7. I had screwed up change 6 below and broken the rules for the use of
500 setjmp(). Now fixed.
501
502
503 Version 1.03 18-Dec-97
504 ----------------------
505
506 1. A erroneous regex with a missing opening parenthesis was correctly
507 diagnosed, but PCRE attempted to access brastack[-1], which could cause crashes
508 on some systems.
509
510 2. Replaced offsetof(real_pcre, code) by offsetof(real_pcre, code[0]) because
511 it was reported that one broken compiler failed on the former because "code" is
512 also an independent variable.
513
514 3. The erroneous regex a[]b caused an array overrun reference.
515
516 4. A regex ending with a one-character negative class (e.g. /[^k]$/) did not
517 fail on data ending with that character. (It was going on too far, and checking
518 the next character, typically a binary zero.) This was specific to the
519 optimized code for single-character negative classes.
520
521 5. Added a contributed patch from the TIN world which does the following:
522
523 + Add an undef for memmove, in case the the system defines a macro for it.
524
525 + Add a definition of offsetof(), in case there isn't one. (I don't know
526 the reason behind this - offsetof() is part of the ANSI standard - but
527 it does no harm).
528
529 + Reduce the ifdef's in pcre.c using macro DPRINTF, thereby eliminating
530 most of the places where whitespace preceded '#'. I have given up and
531 allowed the remaining 2 cases to be at the margin.
532
533 + Rename some variables in pcre to eliminate shadowing. This seems very
534 pedantic, but does no harm, of course.
535
536 6. Moved the call to setjmp() into its own function, to get rid of warnings
537 from gcc -Wall, and avoided calling it at all unless PCRE_EXTRA is used.
538
539 7. Constructs such as \d{8,} were compiling into the equivalent of
540 \d{8}\d{0,65527} instead of \d{8}\d* which didn't make much difference to the
541 outcome, but in this particular case used more store than had been allocated,
542 which caused the bug to be discovered because it threw up an internal error.
543
544 8. The debugging code in both pcre and pcretest for outputting the compiled
545 form of a regex was going wrong in the case of back references followed by
546 curly-bracketed repeats.
547
548
549 Version 1.02 12-Dec-97
550 ----------------------
551
552 1. Typos in pcre.3 and comments in the source fixed.
553
554 2. Applied a contributed patch to get rid of places where it used to remove
555 'const' from variables, and fixed some signed/unsigned and uninitialized
556 variable warnings.
557
558 3. Added the "runtest" target to Makefile.
559
560 4. Set default compiler flag to -O2 rather than just -O.
561
562
563 Version 1.01 19-Nov-97
564 ----------------------
565
566 1. PCRE was failing to diagnose unlimited repeat of empty string for patterns
567 like /([ab]*)*/, that is, for classes with more than one character in them.
568
569 2. Likewise, it wasn't diagnosing patterns with "once-only" subpatterns, such
570 as /((?>a*))*/ (a PCRE_EXTRA facility).
571
572
573 Version 1.00 18-Nov-97
574 ----------------------
575
576 1. Added compile-time macros to support systems such as SunOS4 which don't have
577 memmove() or strerror() but have other things that can be used instead.
578
579 2. Arranged that "make clean" removes the executables.
580
581
582 Version 0.99 27-Oct-97
583 ----------------------
584
585 1. Fixed bug in code for optimizing classes with only one character. It was
586 initializing a 32-byte map regardless, which could cause it to run off the end
587 of the memory it had got.
588
589 2. Added, conditional on PCRE_EXTRA, the proposed (?>REGEX) construction.
590
591
592 Version 0.98 22-Oct-97
593 ----------------------
594
595 1. Fixed bug in code for handling temporary memory usage when there are more
596 back references than supplied space in the ovector. This could cause segfaults.
597
598
599 Version 0.97 21-Oct-97
600 ----------------------
601
602 1. Added the \X "cut" facility, conditional on PCRE_EXTRA.
603
604 2. Optimized negated single characters not to use a bit map.
605
606 3. Brought error texts together as macro definitions; clarified some of them;
607 fixed one that was wrong - it said "range out of order" when it meant "invalid
608 escape sequence".
609
610 4. Changed some char * arguments to const char *.
611
612 5. Added PCRE_NOTBOL and PCRE_NOTEOL (from POSIX).
613
614 6. Added the POSIX-style API wrapper in pcreposix.a and testing facilities in
615 pcretest.
616
617
618 Version 0.96 16-Oct-97
619 ----------------------
620
621 1. Added a simple "pgrep" utility to the distribution.
622
623 2. Fixed an incompatibility with Perl: "{" is now treated as a normal character
624 unless it appears in one of the precise forms "{ddd}", "{ddd,}", or "{ddd,ddd}"
625 where "ddd" means "one or more decimal digits".
626
627 3. Fixed serious bug. If a pattern had a back reference, but the call to
628 pcre_exec() didn't supply a large enough ovector to record the related
629 identifying subpattern, the match always failed. PCRE now remembers the number
630 of the largest back reference, and gets some temporary memory in which to save
631 the offsets during matching if necessary, in order to ensure that
632 backreferences always work.
633
634 4. Increased the compatibility with Perl in a number of ways:
635
636 (a) . no longer matches \n by default; an option PCRE_DOTALL is provided
637 to request this handling. The option can be set at compile or exec time.
638
639 (b) $ matches before a terminating newline by default; an option
640 PCRE_DOLLAR_ENDONLY is provided to override this (but not in multiline
641 mode). The option can be set at compile or exec time.
642
643 (c) The handling of \ followed by a digit other than 0 is now supposed to be
644 the same as Perl's. If the decimal number it represents is less than 10
645 or there aren't that many previous left capturing parentheses, an octal
646 escape is read. Inside a character class, it's always an octal escape,
647 even if it is a single digit.
648
649 (d) An escaped but undefined alphabetic character is taken as a literal,
650 unless PCRE_EXTRA is set. Currently this just reserves the remaining
651 escapes.
652
653 (e) {0} is now permitted. (The previous item is removed from the compiled
654 pattern).
655
656 5. Changed all the names of code files so that the basic parts are no longer
657 than 10 characters, and abolished the teeny "globals.c" file.
658
659 6. Changed the handling of character classes; they are now done with a 32-byte
660 bit map always.
661
662 7. Added the -d and /D options to pcretest to make it possible to look at the
663 internals of compilation without having to recompile pcre.
664
665
666 Version 0.95 23-Sep-97
667 ----------------------
668
669 1. Fixed bug in pre-pass concerning escaped "normal" characters such as \x5c or
670 \x20 at the start of a run of normal characters. These were being treated as
671 real characters, instead of the source characters being re-checked.
672
673
674 Version 0.94 18-Sep-97
675 ----------------------
676
677 1. The functions are now thread-safe, with the caveat that the global variables
678 containing pointers to malloc() and free() or alternative functions are the
679 same for all threads.
680
681 2. Get pcre_study() to generate a bitmap of initial characters for non-
682 anchored patterns when this is possible, and use it if passed to pcre_exec().
683
684
685 Version 0.93 15-Sep-97
686 ----------------------
687
688 1. /(b)|(:+)/ was computing an incorrect first character.
689
690 2. Add pcre_study() to the API and the passing of pcre_extra to pcre_exec(),
691 but not actually doing anything yet.
692
693 3. Treat "-" characters in classes that cannot be part of ranges as literals,
694 as Perl does (e.g. [-az] or [az-]).
695
696 4. Set the anchored flag if a branch starts with .* or .*? because that tests
697 all possible positions.
698
699 5. Split up into different modules to avoid including unneeded functions in a
700 compiled binary. However, compile and exec are still in one module. The "study"
701 function is split off.
702
703 6. The character tables are now in a separate module whose source is generated
704 by an auxiliary program - but can then be edited by hand if required. There are
705 now no calls to isalnum(), isspace(), isdigit(), isxdigit(), tolower() or
706 toupper() in the code.
707
708 7. Turn the malloc/free funtions variables into pcre_malloc and pcre_free and
709 make them global. Abolish the function for setting them, as the caller can now
710 set them directly.
711
712
713 Version 0.92 11-Sep-97
714 ----------------------
715
716 1. A repeat with a fixed maximum and a minimum of 1 for an ordinary character
717 (e.g. /a{1,3}/) was broken (I mis-optimized it).
718
719 2. Caseless matching was not working in character classes if the characters in
720 the pattern were in upper case.
721
722 3. Make ranges like [W-c] work in the same way as Perl for caseless matching.
723
724 4. Make PCRE_ANCHORED public and accept as a compile option.
725
726 5. Add an options word to pcre_exec() and accept PCRE_ANCHORED and
727 PCRE_CASELESS at run time. Add escapes \A and \I to pcretest to cause it to
728 pass them.
729
730 6. Give an error if bad option bits passed at compile or run time.
731
732 7. Add PCRE_MULTILINE at compile and exec time, and (?m) as well. Add \M to
733 pcretest to cause it to pass that flag.
734
735 8. Add pcre_info(), to get the number of identifying subpatterns, the stored
736 options, and the first character, if set.
737
738 9. Recognize C+ or C{n,m} where n >= 1 as providing a fixed starting character.
739
740
741 Version 0.91 10-Sep-97
742 ----------------------
743
744 1. PCRE was failing to diagnose unlimited repeats of subpatterns that could
745 match the empty string as in /(a*)*/. It was looping and ultimately crashing.
746
747 2. PCRE was looping on encountering an indefinitely repeated back reference to
748 a subpattern that had matched an empty string, e.g. /(a|)\1*/. It now does what
749 Perl does - treats the match as successful.
750
751 ****

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