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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4    Version 3.8 18-Dec-01
5    ---------------------
6    
7    1. The experimental UTF-8 code was completely screwed up. It was packing the
8    bytes in the wrong order. How dumb can you get?
9    
10    
11    Version 3.7 29-Oct-01
12    ---------------------
13    
14    1. In updating pcretest to check change 1 of version 3.6, I screwed up.
15    This caused pcretest, when used on the test data, to segfault. Unfortunately,
16    this didn't happen under Solaris 8, where I normally test things.
17    
18    2. The Makefile had to be changed to make it work on BSD systems, where 'make'
19    doesn't seem to recognize that ./xxx and xxx are the same file. (This entry
20    isn't in ChangeLog distributed with 3.7 because I forgot when I hastily made
21    this fix an hour or so after the initial 3.7 release.)
22    
23    
24    Version 3.6 23-Oct-01
25    ---------------------
26    
27    1. Crashed with /(sens|respons)e and \1ibility/ and "sense and sensibility" if
28    offsets passed as NULL with zero offset count.
29    
30    2. The config.guess and config.sub files had not been updated when I moved to
31    the latest autoconf.
32    
33    
34    Version 3.5 15-Aug-01
35    ---------------------
36    
37    1. Added some missing #if !defined NOPOSIX conditionals in pcretest.c that
38    had been forgotten.
39    
40    2. By using declared but undefined structures, we can avoid using "void"
41    definitions in pcre.h while keeping the internal definitions of the structures
42    private.
43    
44    3. The distribution is now built using autoconf 2.50 and libtool 1.4. From a
45    user point of view, this means that both static and shared libraries are built
46    by default, but this can be individually controlled. More of the work of
47    handling this static/shared cases is now inside libtool instead of PCRE's make
48    file.
49    
50    4. The pcretest utility is now installed along with pcregrep because it is
51    useful for users (to test regexs) and by doing this, it automatically gets
52    relinked by libtool. The documentation has been turned into a man page, so
53    there are now .1, .txt, and .html versions in /doc.
54    
55    5. Upgrades to pcregrep:
56       (i)   Added long-form option names like gnu grep.
57       (ii)  Added --help to list all options with an explanatory phrase.
58       (iii) Added -r, --recursive to recurse into sub-directories.
59       (iv)  Added -f, --file to read patterns from a file.
60    
61    6. pcre_exec() was referring to its "code" argument before testing that
62    argument for NULL (and giving an error if it was NULL).
63    
64    7. Upgraded Makefile.in to allow for compiling in a different directory from
65    the source directory.
66    
67    8. Tiny buglet in pcretest: when pcre_fullinfo() was called to retrieve the
68    options bits, the pointer it was passed was to an int instead of to an unsigned
69    long int. This mattered only on 64-bit systems.
70    
71    9. Fixed typo (3.4/1) in pcre.h again. Sigh. I had changed pcre.h (which is
72    generated) instead of pcre.in, which it its source. Also made the same change
73    in several of the .c files.
74    
75    10. A new release of gcc defines printf() as a macro, which broke pcretest
76    because it had an ifdef in the middle of a string argument for printf(). Fixed
77    by using separate calls to printf().
78    
79    11. Added --enable-newline-is-cr and --enable-newline-is-lf to the configure
80    script, to force use of CR or LF instead of \n in the source. On non-Unix
81    systems, the value can be set in config.h.
82    
83    12. The limit of 200 on non-capturing parentheses is a _nesting_ limit, not an
84    absolute limit. Changed the text of the error message to make this clear, and
85    likewise updated the man page.
86    
87    13. The limit of 99 on the number of capturing subpatterns has been removed.
88    The new limit is 65535, which I hope will not be a "real" limit.
89    
90    
91    Version 3.4 22-Aug-00
92    ---------------------
93    
94    1. Fixed typo in pcre.h: unsigned const char * changed to const unsigned char *.
95    
96    2. Diagnose condition (?(0) as an error instead of crashing on matching.
97    
98    
99    Version 3.3 01-Aug-00
100    ---------------------
101    
102    1. If an octal character was given, but the value was greater than \377, it
103    was not getting masked to the least significant bits, as documented. This could
104    lead to crashes in some systems.
105    
106    2. Perl 5.6 (if not earlier versions) accepts classes like [a-\d] and treats
107    the hyphen as a literal. PCRE used to give an error; it now behaves like Perl.
108    
109    3. Added the functions pcre_free_substring() and pcre_free_substring_list().
110    These just pass their arguments on to (pcre_free)(), but they are provided
111    because some uses of PCRE bind it to non-C systems that can call its functions,
112    but cannot call free() or pcre_free() directly.
113    
114    4. Add "make test" as a synonym for "make check". Corrected some comments in
115    the Makefile.
116    
117    5. Add $(DESTDIR)/ in front of all the paths in the "install" target in the
118    Makefile.
119    
120    6. Changed the name of pgrep to pcregrep, because Solaris has introduced a
121    command called pgrep for grepping around the active processes.
122    
123    7. Added the beginnings of support for UTF-8 character strings.
124    
125    8. Arranged for the Makefile to pass over the settings of CC, CFLAGS, and
126    RANLIB to ./ltconfig so that they are used by libtool. I think these are all
127    the relevant ones. (AR is not passed because ./ltconfig does its own figuring
128    out for the ar command.)
129    
130    
131    Version 3.2 12-May-00
132    ---------------------
133    
134    This is purely a bug fixing release.
135    
136    1. If the pattern /((Z)+|A)*/ was matched agained ZABCDEFG it matched Z instead
137    of ZA. This was just one example of several cases that could provoke this bug,
138    which was introduced by change 9 of version 2.00. The code for breaking
139    infinite loops after an iteration that matches an empty string was't working
140    correctly.
141    
142    2. The pcretest program was not imitating Perl correctly for the pattern /a*/g
143    when matched against abbab (for example). After matching an empty string, it
144    wasn't forcing anchoring when setting PCRE_NOTEMPTY for the next attempt; this
145    caused it to match further down the string than it should.
146    
147    3. The code contained an inclusion of sys/types.h. It isn't clear why this
148    was there because it doesn't seem to be needed, and it causes trouble on some
149    systems, as it is not a Standard C header. It has been removed.
150    
151    4. Made 4 silly changes to the source to avoid stupid compiler warnings that
152    were reported on the Macintosh. The changes were from
153    
154      while ((c = *(++ptr)) != 0 && c != '\n');
155    to
156      while ((c = *(++ptr)) != 0 && c != '\n') ;
157    
158    Totally extraordinary, but if that's what it takes...
159    
160    5. PCRE is being used in one environment where neither memmove() nor bcopy() is
161    available. Added HAVE_BCOPY and an autoconf test for it; if neither
162    HAVE_MEMMOVE nor HAVE_BCOPY is set, use a built-in emulation function which
163    assumes the way PCRE uses memmove() (always moving upwards).
164    
165    6. PCRE is being used in one environment where strchr() is not available. There
166    was only one use in pcre.c, and writing it out to avoid strchr() probably gives
167    faster code anyway.
168    
169    
170    Version 3.1 09-Feb-00
171    ---------------------
172    
173    The only change in this release is the fixing of some bugs in Makefile.in for
174    the "install" target:
175    
176    (1) It was failing to install pcreposix.h.
177    
178    (2) It was overwriting the pcre.3 man page with the pcreposix.3 man page.
179    
180    
181    Version 3.0 01-Feb-00
182    ---------------------
183    
184    1. Add support for the /+ modifier to perltest (to output $` like it does in
185    pcretest).
186    
187    2. Add support for the /g modifier to perltest.
188    
189    3. Fix pcretest so that it behaves even more like Perl for /g when the pattern
190    matches null strings.
191    
192    4. Fix perltest so that it doesn't do unwanted things when fed an empty
193    pattern. Perl treats empty patterns specially - it reuses the most recent
194    pattern, which is not what we want. Replace // by /(?#)/ in order to avoid this
195    effect.
196    
197    5. The POSIX interface was broken in that it was just handing over the POSIX
198    captured string vector to pcre_exec(), but (since release 2.00) PCRE has
199    required a bigger vector, with some working space on the end. This means that
200    the POSIX wrapper now has to get and free some memory, and copy the results.
201    
202    6. Added some simple autoconf support, placing the test data and the
203    documentation in separate directories, re-organizing some of the
204    information files, and making it build pcre-config (a GNU standard). Also added
205    libtool support for building PCRE as a shared library, which is now the
206    default.
207    
208    7. Got rid of the leading zero in the definition of PCRE_MINOR because 08 and
209    09 are not valid octal constants. Single digits will be used for minor values
210    less than 10.
211    
212    8. Defined REG_EXTENDED and REG_NOSUB as zero in the POSIX header, so that
213    existing programs that set these in the POSIX interface can use PCRE without
214    modification.
215    
216    9. Added a new function, pcre_fullinfo() with an extensible interface. It can
217    return all that pcre_info() returns, plus additional data. The pcre_info()
218    function is retained for compatibility, but is considered to be obsolete.
219    
220    10. Added experimental recursion feature (?R) to handle one common case that
221    Perl 5.6 will be able to do with (?p{...}).
222    
223    11. Added support for POSIX character classes like [:alpha:], which Perl is
224    adopting.
225    
226    
227    Version 2.08 31-Aug-99
228    ----------------------
229    
230    1. When startoffset was not zero and the pattern began with ".*", PCRE was not
231    trying to match at the startoffset position, but instead was moving forward to
232    the next newline as if a previous match had failed.
233    
234    2. pcretest was not making use of PCRE_NOTEMPTY when repeating for /g and /G,
235    and could get into a loop if a null string was matched other than at the start
236    of the subject.
237    
238    3. Added definitions of PCRE_MAJOR and PCRE_MINOR to pcre.h so the version can
239    be distinguished at compile time, and for completeness also added PCRE_DATE.
240    
241    5. Added Paul Sokolovsky's minor changes to make it easy to compile a Win32 DLL
242    in GnuWin32 environments.
243    
244    
245    Version 2.07 29-Jul-99
246    ----------------------
247    
248    1. The documentation is now supplied in plain text form and HTML as well as in
249    the form of man page sources.
250    
251    2. C++ compilers don't like assigning (void *) values to other pointer types.
252    In particular this affects malloc(). Although there is no problem in Standard
253    C, I've put in casts to keep C++ compilers happy.
254    
255    3. Typo on pcretest.c; a cast of (unsigned char *) in the POSIX regexec() call
256    should be (const char *).
257    
258    4. If NOPOSIX is defined, pcretest.c compiles without POSIX support. This may
259    be useful for non-Unix systems who don't want to bother with the POSIX stuff.
260    However, I haven't made this a standard facility. The documentation doesn't
261    mention it, and the Makefile doesn't support it.
262    
263    5. The Makefile now contains an "install" target, with editable destinations at
264    the top of the file. The pcretest program is not installed.
265    
266    6. pgrep -V now gives the PCRE version number and date.
267    
268    7. Fixed bug: a zero repetition after a literal string (e.g. /abcde{0}/) was
269    causing the entire string to be ignored, instead of just the last character.
270    
271    8. If a pattern like /"([^\\"]+|\\.)*"/ is applied in the normal way to a
272    non-matching string, it can take a very, very long time, even for strings of
273    quite modest length, because of the nested recursion. PCRE now does better in
274    some of these cases. It does this by remembering the last required literal
275    character in the pattern, and pre-searching the subject to ensure it is present
276    before running the real match. In other words, it applies a heuristic to detect
277    some types of certain failure quickly, and in the above example, if presented
278    with a string that has no trailing " it gives "no match" very quickly.
279    
280    9. A new runtime option PCRE_NOTEMPTY causes null string matches to be ignored;
281    other alternatives are tried instead.
282    
283    
284    Version 2.06 09-Jun-99
285    ----------------------
286    
287    1. Change pcretest's output for amount of store used to show just the code
288    space, because the remainder (the data block) varies in size between 32-bit and
289    64-bit systems.
290    
291    2. Added an extra argument to pcre_exec() to supply an offset in the subject to
292    start matching at. This allows lookbehinds to work when searching for multiple
293    occurrences in a string.
294    
295    3. Added additional options to pcretest for testing multiple occurrences:
296    
297       /+   outputs the rest of the string that follows a match
298       /g   loops for multiple occurrences, using the new startoffset argument
299       /G   loops for multiple occurrences by passing an incremented pointer
300    
301    4. PCRE wasn't doing the "first character" optimization for patterns starting
302    with \b or \B, though it was doing it for other lookbehind assertions. That is,
303    it wasn't noticing that a match for a pattern such as /\bxyz/ has to start with
304    the letter 'x'. On long subject strings, this gives a significant speed-up.
305    
306    
307    Version 2.05 21-Apr-99
308    ----------------------
309    
310    1. Changed the type of magic_number from int to long int so that it works
311    properly on 16-bit systems.
312    
313    2. Fixed a bug which caused patterns starting with .* not to work correctly
314    when the subject string contained newline characters. PCRE was assuming
315    anchoring for such patterns in all cases, which is not correct because .* will
316    not pass a newline unless PCRE_DOTALL is set. It now assumes anchoring only if
317    DOTALL is set at top level; otherwise it knows that patterns starting with .*
318    must be retried after every newline in the subject.
319    
320    
321    Version 2.04 18-Feb-99
322    ----------------------
323    
324    1. For parenthesized subpatterns with repeats whose minimum was zero, the
325    computation of the store needed to hold the pattern was incorrect (too large).
326    If such patterns were nested a few deep, this could multiply and become a real
327    problem.
328    
329    2. Added /M option to pcretest to show the memory requirement of a specific
330    pattern. Made -m a synonym of -s (which does this globally) for compatibility.
331    
332    3. Subpatterns of the form (regex){n,m} (i.e. limited maximum) were being
333    compiled in such a way that the backtracking after subsequent failure was
334    pessimal. Something like (a){0,3} was compiled as (a)?(a)?(a)? instead of
335    ((a)((a)(a)?)?)? with disastrous performance if the maximum was of any size.
336    
337    
338    Version 2.03 02-Feb-99
339    ----------------------
340    
341    1. Fixed typo and small mistake in man page.
342    
343    2. Added 4th condition (GPL supersedes if conflict) and created separate
344    LICENCE file containing the conditions.
345    
346    3. Updated pcretest so that patterns such as /abc\/def/ work like they do in
347    Perl, that is the internal \ allows the delimiter to be included in the
348    pattern. Locked out the use of \ as a delimiter. If \ immediately follows
349    the final delimiter, add \ to the end of the pattern (to test the error).
350    
351    4. Added the convenience functions for extracting substrings after a successful
352    match. Updated pcretest to make it able to test these functions.
353    
354    
355    Version 2.02 14-Jan-99
356    ----------------------
357    
358    1. Initialized the working variables associated with each extraction so that
359    their saving and restoring doesn't refer to uninitialized store.
360    
361    2. Put dummy code into study.c in order to trick the optimizer of the IBM C
362    compiler for OS/2 into generating correct code. Apparently IBM isn't going to
363    fix the problem.
364    
365    3. Pcretest: the timing code wasn't using LOOPREPEAT for timing execution
366    calls, and wasn't printing the correct value for compiling calls. Increased the
367    default value of LOOPREPEAT, and the number of significant figures in the
368    times.
369    
370    4. Changed "/bin/rm" in the Makefile to "-rm" so it works on Windows NT.
371    
372    5. Renamed "deftables" as "dftables" to get it down to 8 characters, to avoid
373    a building problem on Windows NT with a FAT file system.
374    
375    
376    Version 2.01 21-Oct-98
377    ----------------------
378    
379    1. Changed the API for pcre_compile() to allow for the provision of a pointer
380    to character tables built by pcre_maketables() in the current locale. If NULL
381    is passed, the default tables are used.
382    
383    
384    Version 2.00 24-Sep-98
385    ----------------------
386    
387    1. Since the (>?) facility is in Perl 5.005, don't require PCRE_EXTRA to enable
388    it any more.
389    
390    2. Allow quantification of (?>) groups, and make it work correctly.
391    
392    3. The first character computation wasn't working for (?>) groups.
393    
394    4. Correct the implementation of \Z (it is permitted to match on the \n at the
395    end of the subject) and add 5.005's \z, which really does match only at the
396    very end of the subject.
397    
398    5. Remove the \X "cut" facility; Perl doesn't have it, and (?> is neater.
399    
400    6. Remove the ability to specify CASELESS, MULTILINE, DOTALL, and
401    DOLLAR_END_ONLY at runtime, to make it possible to implement the Perl 5.005
402    localized options. All options to pcre_study() were also removed.
403    
404    7. Add other new features from 5.005:
405    
406       $(?<=           positive lookbehind
407       $(?<!           negative lookbehind
408       (?imsx-imsx)    added the unsetting capability
409                       such a setting is global if at outer level; local otherwise
410       (?imsx-imsx:)   non-capturing groups with option setting
411       (?(cond)re|re)  conditional pattern matching
412    
413       A backreference to itself in a repeated group matches the previous
414       captured string.
415    
416    8. General tidying up of studying (both automatic and via "study")
417    consequential on the addition of new assertions.
418    
419    9. As in 5.005, unlimited repeated groups that could match an empty substring
420    are no longer faulted at compile time. Instead, the loop is forcibly broken at
421    runtime if any iteration does actually match an empty substring.
422    
423    10. Include the RunTest script in the distribution.
424    
425    11. Added tests from the Perl 5.005_02 distribution. This showed up a few
426    discrepancies, some of which were old and were also with respect to 5.004. They
427    have now been fixed.
428    
429    
430    Version 1.09 28-Apr-98
431    ----------------------
432    
433    1. A negated single character class followed by a quantifier with a minimum
434    value of one (e.g.  [^x]{1,6}  ) was not compiled correctly. This could lead to
435    program crashes, or just wrong answers. This did not apply to negated classes
436    containing more than one character, or to minima other than one.
437    
438    
439    Version 1.08 27-Mar-98
440    ----------------------
441    
442    1. Add PCRE_UNGREEDY to invert the greediness of quantifiers.
443    
444    2. Add (?U) and (?X) to set PCRE_UNGREEDY and PCRE_EXTRA respectively. The
445    latter must appear before anything that relies on it in the pattern.
446    
447    
448  Version 1.07 16-Feb-98  Version 1.07 16-Feb-98
449  ----------------------  ----------------------

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