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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4    Version 3.0 02-Jan-02
5    ---------------------
7    1. A bit of extraneous text had somehow crept into the pcregrep documentation.
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.)
14    Version 3.8 18-Dec-01
15    ---------------------
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?
21    Version 3.7 29-Oct-01
22    ---------------------
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.
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.)
34    Version 3.6 23-Oct-01
35    ---------------------
37    1. Crashed with /(sens|respons)e and \1ibility/ and "sense and sensibility" if
38    offsets passed as NULL with zero offset count.
40    2. The config.guess and config.sub files had not been updated when I moved to
41    the latest autoconf.
44    Version 3.5 15-Aug-01
45    ---------------------
47    1. Added some missing #if !defined NOPOSIX conditionals in pcretest.c that
48    had been forgotten.
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.
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.
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.
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.
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).
74    7. Upgraded Makefile.in to allow for compiling in a different directory from
75    the source directory.
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.
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.
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().
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.
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.
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.
101    Version 3.4 22-Aug-00
102    ---------------------
104    1. Fixed typo in pcre.h: unsigned const char * changed to const unsigned char *.
106    2. Diagnose condition (?(0) as an error instead of crashing on matching.
109    Version 3.3 01-Aug-00
110    ---------------------
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.
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.
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.
124    4. Add "make test" as a synonym for "make check". Corrected some comments in
125    the Makefile.
127    5. Add $(DESTDIR)/ in front of all the paths in the "install" target in the
128    Makefile.
130    6. Changed the name of pgrep to pcregrep, because Solaris has introduced a
131    command called pgrep for grepping around the active processes.
133    7. Added the beginnings of support for UTF-8 character strings.
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.)
141    Version 3.2 12-May-00
142    ---------------------
144    This is purely a bug fixing release.
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.
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.
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.
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
164      while ((c = *(++ptr)) != 0 && c != '\n');
165    to
166      while ((c = *(++ptr)) != 0 && c != '\n') ;
168    Totally extraordinary, but if that's what it takes...
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).
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.
180    Version 3.1 09-Feb-00
181    ---------------------
183    The only change in this release is the fixing of some bugs in Makefile.in for
184    the "install" target:
186    (1) It was failing to install pcreposix.h.
188    (2) It was overwriting the pcre.3 man page with the pcreposix.3 man page.
191    Version 3.0 01-Feb-00
192    ---------------------
194    1. Add support for the /+ modifier to perltest (to output $` like it does in
195    pcretest).
197    2. Add support for the /g modifier to perltest.
199    3. Fix pcretest so that it behaves even more like Perl for /g when the pattern
200    matches null strings.
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.
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.
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.
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.
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.
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.
230    10. Added experimental recursion feature (?R) to handle one common case that
231    Perl 5.6 will be able to do with (?p{...}).
233    11. Added support for POSIX character classes like [:alpha:], which Perl is
234    adopting.
237    Version 2.08 31-Aug-99
238    ----------------------
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.
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.
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.
251    5. Added Paul Sokolovsky's minor changes to make it easy to compile a Win32 DLL
252    in GnuWin32 environments.
255    Version 2.07 29-Jul-99
256    ----------------------
258    1. The documentation is now supplied in plain text form and HTML as well as in
259    the form of man page sources.
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.
265    3. Typo on pcretest.c; a cast of (unsigned char *) in the POSIX regexec() call
266    should be (const char *).
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.
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.
276    6. pgrep -V now gives the PCRE version number and date.
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.
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.
290    9. A new runtime option PCRE_NOTEMPTY causes null string matches to be ignored;
291    other alternatives are tried instead.
294    Version 2.06 09-Jun-99
295    ----------------------
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.
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.
305    3. Added additional options to pcretest for testing multiple occurrences:
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
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.
317    Version 2.05 21-Apr-99
318    ----------------------
320    1. Changed the type of magic_number from int to long int so that it works
321    properly on 16-bit systems.
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.
331    Version 2.04 18-Feb-99
332    ----------------------
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.
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.
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.
348    Version 2.03 02-Feb-99
349    ----------------------
351    1. Fixed typo and small mistake in man page.
353    2. Added 4th condition (GPL supersedes if conflict) and created separate
354    LICENCE file containing the conditions.
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).
361    4. Added the convenience functions for extracting substrings after a successful
362    match. Updated pcretest to make it able to test these functions.
365    Version 2.02 14-Jan-99
366    ----------------------
368    1. Initialized the working variables associated with each extraction so that
369    their saving and restoring doesn't refer to uninitialized store.
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.
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.
380    4. Changed "/bin/rm" in the Makefile to "-rm" so it works on Windows NT.
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.
386    Version 2.01 21-Oct-98
387    ----------------------
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.
394    Version 2.00 24-Sep-98
395    ----------------------
397    1. Since the (>?) facility is in Perl 5.005, don't require PCRE_EXTRA to enable
398    it any more.
400    2. Allow quantification of (?>) groups, and make it work correctly.
402    3. The first character computation wasn't working for (?>) groups.
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.
408    5. Remove the \X "cut" facility; Perl doesn't have it, and (?> is neater.
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.
414    7. Add other new features from 5.005:
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
423       A backreference to itself in a repeated group matches the previous
424       captured string.
426    8. General tidying up of studying (both automatic and via "study")
427    consequential on the addition of new assertions.
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.
433    10. Include the RunTest script in the distribution.
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.
440    Version 1.09 28-Apr-98
441    ----------------------
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.
449    Version 1.08 27-Mar-98
450    ----------------------
452    1. Add PCRE_UNGREEDY to invert the greediness of quantifiers.
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.
458    Version 1.07 16-Feb-98
459    ----------------------
461    1. A pattern such as /((a)*)*/ was not being diagnosed as in error (unlimited
462    repeat of a potentially empty string).
465    Version 1.06 23-Jan-98
466    ----------------------
468    1. Added Markus Oberhumer's little patches for C++.
470    2. Literal strings longer than 255 characters were broken.
473    Version 1.05 23-Dec-97
474    ----------------------
476    1. Negated character classes containing more than one character were failing if
477    PCRE_CASELESS was set at run time.
480    Version 1.04 19-Dec-97
481    ----------------------
483    1. Corrected the man page, where some "const" qualifiers had been omitted.
485    2. Made debugging output print "{0,xxx}" instead of just "{,xxx}" to agree with
486    input syntax.
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.
492    4. Tidied pcretest to ensure it frees memory that it gets.
494    5. Temporary memory was being obtained in the case where the passed offsets
495    vector was exactly big enough.
497    6. Corrected definition of offsetof() from change 5 below.
499    7. I had screwed up change 6 below and broken the rules for the use of
500    setjmp(). Now fixed.
503    Version 1.03 18-Dec-97
504    ----------------------
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.
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.
514    3. The erroneous regex a[]b caused an array overrun reference.
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.
521    5. Added a contributed patch from the TIN world which does the following:
523      + Add an undef for memmove, in case the the system defines a macro for it.
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).
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.
533      + Rename some variables in pcre to eliminate shadowing. This seems very
534        pedantic, but does no harm, of course.
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.
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.
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.
549  Version 1.02 12-Dec-97  Version 1.02 12-Dec-97
550  ----------------------  ----------------------

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