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

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