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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4    Version 3.7 29-Oct-01
5    ---------------------
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.
12    Version 3.6 23-Oct-01
13    ---------------------
15    1. Crashed with /(sens|respons)e and \1ibility/ and "sense and sensibility" if
16    offsets passed as NULL with zero offset count.
18    2. The config.guess and config.sub files had not been updated when I moved to
19    the latest autoconf.
22    Version 3.5 15-Aug-01
23    ---------------------
25    1. Added some missing #if !defined NOPOSIX conditionals in pcretest.c that
26    had been forgotten.
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.
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.
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.
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.
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).
52    7. Upgraded Makefile.in to allow for compiling in a different directory from
53    the source directory.
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.
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.
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().
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.
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.
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.
79    Version 3.4 22-Aug-00
80    ---------------------
82    1. Fixed typo in pcre.h: unsigned const char * changed to const unsigned char *.
84    2. Diagnose condition (?(0) as an error instead of crashing on matching.
87    Version 3.3 01-Aug-00
88    ---------------------
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.
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.
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.
102    4. Add "make test" as a synonym for "make check". Corrected some comments in
103    the Makefile.
105    5. Add $(DESTDIR)/ in front of all the paths in the "install" target in the
106    Makefile.
108    6. Changed the name of pgrep to pcregrep, because Solaris has introduced a
109    command called pgrep for grepping around the active processes.
111    7. Added the beginnings of support for UTF-8 character strings.
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.)
119    Version 3.2 12-May-00
120    ---------------------
122    This is purely a bug fixing release.
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.
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.
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.
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
142      while ((c = *(++ptr)) != 0 && c != '\n');
143    to
144      while ((c = *(++ptr)) != 0 && c != '\n') ;
146    Totally extraordinary, but if that's what it takes...
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).
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.
158    Version 3.1 09-Feb-00
159    ---------------------
161    The only change in this release is the fixing of some bugs in Makefile.in for
162    the "install" target:
164    (1) It was failing to install pcreposix.h.
166    (2) It was overwriting the pcre.3 man page with the pcreposix.3 man page.
169    Version 3.0 01-Feb-00
170    ---------------------
172    1. Add support for the /+ modifier to perltest (to output $` like it does in
173    pcretest).
175    2. Add support for the /g modifier to perltest.
177    3. Fix pcretest so that it behaves even more like Perl for /g when the pattern
178    matches null strings.
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.
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.
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.
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.
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.
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.
208    10. Added experimental recursion feature (?R) to handle one common case that
209    Perl 5.6 will be able to do with (?p{...}).
211    11. Added support for POSIX character classes like [:alpha:], which Perl is
212    adopting.
215    Version 2.08 31-Aug-99
216    ----------------------
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.
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.
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.
229    5. Added Paul Sokolovsky's minor changes to make it easy to compile a Win32 DLL
230    in GnuWin32 environments.
233    Version 2.07 29-Jul-99
234    ----------------------
236    1. The documentation is now supplied in plain text form and HTML as well as in
237    the form of man page sources.
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.
243    3. Typo on pcretest.c; a cast of (unsigned char *) in the POSIX regexec() call
244    should be (const char *).
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.
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.
254    6. pgrep -V now gives the PCRE version number and date.
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.
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.
268    9. A new runtime option PCRE_NOTEMPTY causes null string matches to be ignored;
269    other alternatives are tried instead.
272    Version 2.06 09-Jun-99
273    ----------------------
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.
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.
283    3. Added additional options to pcretest for testing multiple occurrences:
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
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.
295    Version 2.05 21-Apr-99
296    ----------------------
298    1. Changed the type of magic_number from int to long int so that it works
299    properly on 16-bit systems.
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.
309    Version 2.04 18-Feb-99
310    ----------------------
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.
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.
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.
326    Version 2.03 02-Feb-99
327    ----------------------
329    1. Fixed typo and small mistake in man page.
331    2. Added 4th condition (GPL supersedes if conflict) and created separate
332    LICENCE file containing the conditions.
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).
339    4. Added the convenience functions for extracting substrings after a successful
340    match. Updated pcretest to make it able to test these functions.
343    Version 2.02 14-Jan-99
344    ----------------------
346    1. Initialized the working variables associated with each extraction so that
347    their saving and restoring doesn't refer to uninitialized store.
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.
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.
358    4. Changed "/bin/rm" in the Makefile to "-rm" so it works on Windows NT.
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.
364  Version 2.01 21-Oct-98  Version 2.01 21-Oct-98
365  ----------------------  ----------------------

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