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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4    Version 3.5 15-Aug-01
5    ---------------------
6    
7    1. Added some missing #if !defined NOPOSIX conditionals in pcretest.c that
8    had been forgotten.
9    
10    2. By using declared but undefined structures, we can avoid using "void"
11    definitions in pcre.h while keeping the internal definitions of the structures
12    private.
13    
14    3. The distribution is now built using autoconf 2.50 and libtool 1.4. From a
15    user point of view, this means that both static and shared libraries are built
16    by default, but this can be individually controlled. More of the work of
17    handling this static/shared cases is now inside libtool instead of PCRE's make
18    file.
19    
20    4. The pcretest utility is now installed along with pcregrep because it is
21    useful for users (to test regexs) and by doing this, it automatically gets
22    relinked by libtool. The documentation has been turned into a man page, so
23    there are now .1, .txt, and .html versions in /doc.
24    
25    5. Upgrades to pcregrep:
26       (i)   Added long-form option names like gnu grep.
27       (ii)  Added --help to list all options with an explanatory phrase.
28       (iii) Added -r, --recursive to recurse into sub-directories.
29       (iv)  Added -f, --file to read patterns from a file.
30    
31    6. pcre_exec() was referring to its "code" argument before testing that
32    argument for NULL (and giving an error if it was NULL).
33    
34    7. Upgraded Makefile.in to allow for compiling in a different directory from
35    the source directory.
36    
37    8. Tiny buglet in pcretest: when pcre_fullinfo() was called to retrieve the
38    options bits, the pointer it was passed was to an int instead of to an unsigned
39    long int. This mattered only on 64-bit systems.
40    
41    9. Fixed typo (3.4/1) in pcre.h again. Sigh. I had changed pcre.h (which is
42    generated) instead of pcre.in, which it its source. Also made the same change
43    in several of the .c files.
44    
45    10. A new release of gcc defines printf() as a macro, which broke pcretest
46    because it had an ifdef in the middle of a string argument for printf(). Fixed
47    by using separate calls to printf().
48    
49    11. Added --enable-newline-is-cr and --enable-newline-is-lf to the configure
50    script, to force use of CR or LF instead of \n in the source. On non-Unix
51    systems, the value can be set in config.h.
52    
53    12. The limit of 200 on non-capturing parentheses is a _nesting_ limit, not an
54    absolute limit. Changed the text of the error message to make this clear, and
55    likewise updated the man page.
56    
57    13. The limit of 99 on the number of capturing subpatterns has been removed.
58    The new limit is 65535, which I hope will not be a "real" limit.
59    
60    
61    Version 3.4 22-Aug-00
62    ---------------------
63    
64    1. Fixed typo in pcre.h: unsigned const char * changed to const unsigned char *.
65    
66    2. Diagnose condition (?(0) as an error instead of crashing on matching.
67    
68    
69    Version 3.3 01-Aug-00
70    ---------------------
71    
72    1. If an octal character was given, but the value was greater than \377, it
73    was not getting masked to the least significant bits, as documented. This could
74    lead to crashes in some systems.
75    
76    2. Perl 5.6 (if not earlier versions) accepts classes like [a-\d] and treats
77    the hyphen as a literal. PCRE used to give an error; it now behaves like Perl.
78    
79    3. Added the functions pcre_free_substring() and pcre_free_substring_list().
80    These just pass their arguments on to (pcre_free)(), but they are provided
81    because some uses of PCRE bind it to non-C systems that can call its functions,
82    but cannot call free() or pcre_free() directly.
83    
84    4. Add "make test" as a synonym for "make check". Corrected some comments in
85    the Makefile.
86    
87    5. Add $(DESTDIR)/ in front of all the paths in the "install" target in the
88    Makefile.
89    
90    6. Changed the name of pgrep to pcregrep, because Solaris has introduced a
91    command called pgrep for grepping around the active processes.
92    
93    7. Added the beginnings of support for UTF-8 character strings.
94    
95    8. Arranged for the Makefile to pass over the settings of CC, CFLAGS, and
96    RANLIB to ./ltconfig so that they are used by libtool. I think these are all
97    the relevant ones. (AR is not passed because ./ltconfig does its own figuring
98    out for the ar command.)
99    
100    
101    Version 3.2 12-May-00
102    ---------------------
103    
104    This is purely a bug fixing release.
105    
106    1. If the pattern /((Z)+|A)*/ was matched agained ZABCDEFG it matched Z instead
107    of ZA. This was just one example of several cases that could provoke this bug,
108    which was introduced by change 9 of version 2.00. The code for breaking
109    infinite loops after an iteration that matches an empty string was't working
110    correctly.
111    
112    2. The pcretest program was not imitating Perl correctly for the pattern /a*/g
113    when matched against abbab (for example). After matching an empty string, it
114    wasn't forcing anchoring when setting PCRE_NOTEMPTY for the next attempt; this
115    caused it to match further down the string than it should.
116    
117    3. The code contained an inclusion of sys/types.h. It isn't clear why this
118    was there because it doesn't seem to be needed, and it causes trouble on some
119    systems, as it is not a Standard C header. It has been removed.
120    
121    4. Made 4 silly changes to the source to avoid stupid compiler warnings that
122    were reported on the Macintosh. The changes were from
123    
124      while ((c = *(++ptr)) != 0 && c != '\n');
125    to
126      while ((c = *(++ptr)) != 0 && c != '\n') ;
127    
128    Totally extraordinary, but if that's what it takes...
129    
130    5. PCRE is being used in one environment where neither memmove() nor bcopy() is
131    available. Added HAVE_BCOPY and an autoconf test for it; if neither
132    HAVE_MEMMOVE nor HAVE_BCOPY is set, use a built-in emulation function which
133    assumes the way PCRE uses memmove() (always moving upwards).
134    
135    6. PCRE is being used in one environment where strchr() is not available. There
136    was only one use in pcre.c, and writing it out to avoid strchr() probably gives
137    faster code anyway.
138    
139    
140    Version 3.1 09-Feb-00
141    ---------------------
142    
143    The only change in this release is the fixing of some bugs in Makefile.in for
144    the "install" target:
145    
146    (1) It was failing to install pcreposix.h.
147    
148    (2) It was overwriting the pcre.3 man page with the pcreposix.3 man page.
149    
150    
151    Version 3.0 01-Feb-00
152    ---------------------
153    
154    1. Add support for the /+ modifier to perltest (to output $` like it does in
155    pcretest).
156    
157    2. Add support for the /g modifier to perltest.
158    
159    3. Fix pcretest so that it behaves even more like Perl for /g when the pattern
160    matches null strings.
161    
162    4. Fix perltest so that it doesn't do unwanted things when fed an empty
163    pattern. Perl treats empty patterns specially - it reuses the most recent
164    pattern, which is not what we want. Replace // by /(?#)/ in order to avoid this
165    effect.
166    
167    5. The POSIX interface was broken in that it was just handing over the POSIX
168    captured string vector to pcre_exec(), but (since release 2.00) PCRE has
169    required a bigger vector, with some working space on the end. This means that
170    the POSIX wrapper now has to get and free some memory, and copy the results.
171    
172    6. Added some simple autoconf support, placing the test data and the
173    documentation in separate directories, re-organizing some of the
174    information files, and making it build pcre-config (a GNU standard). Also added
175    libtool support for building PCRE as a shared library, which is now the
176    default.
177    
178    7. Got rid of the leading zero in the definition of PCRE_MINOR because 08 and
179    09 are not valid octal constants. Single digits will be used for minor values
180    less than 10.
181    
182    8. Defined REG_EXTENDED and REG_NOSUB as zero in the POSIX header, so that
183    existing programs that set these in the POSIX interface can use PCRE without
184    modification.
185    
186    9. Added a new function, pcre_fullinfo() with an extensible interface. It can
187    return all that pcre_info() returns, plus additional data. The pcre_info()
188    function is retained for compatibility, but is considered to be obsolete.
189    
190    10. Added experimental recursion feature (?R) to handle one common case that
191    Perl 5.6 will be able to do with (?p{...}).
192    
193    11. Added support for POSIX character classes like [:alpha:], which Perl is
194    adopting.
195    
196    
197    Version 2.08 31-Aug-99
198    ----------------------
199    
200    1. When startoffset was not zero and the pattern began with ".*", PCRE was not
201    trying to match at the startoffset position, but instead was moving forward to
202    the next newline as if a previous match had failed.
203    
204    2. pcretest was not making use of PCRE_NOTEMPTY when repeating for /g and /G,
205    and could get into a loop if a null string was matched other than at the start
206    of the subject.
207    
208    3. Added definitions of PCRE_MAJOR and PCRE_MINOR to pcre.h so the version can
209    be distinguished at compile time, and for completeness also added PCRE_DATE.
210    
211    5. Added Paul Sokolovsky's minor changes to make it easy to compile a Win32 DLL
212    in GnuWin32 environments.
213    
214    
215    Version 2.07 29-Jul-99
216    ----------------------
217    
218    1. The documentation is now supplied in plain text form and HTML as well as in
219    the form of man page sources.
220    
221    2. C++ compilers don't like assigning (void *) values to other pointer types.
222    In particular this affects malloc(). Although there is no problem in Standard
223    C, I've put in casts to keep C++ compilers happy.
224    
225    3. Typo on pcretest.c; a cast of (unsigned char *) in the POSIX regexec() call
226    should be (const char *).
227    
228    4. If NOPOSIX is defined, pcretest.c compiles without POSIX support. This may
229    be useful for non-Unix systems who don't want to bother with the POSIX stuff.
230    However, I haven't made this a standard facility. The documentation doesn't
231    mention it, and the Makefile doesn't support it.
232    
233    5. The Makefile now contains an "install" target, with editable destinations at
234    the top of the file. The pcretest program is not installed.
235    
236    6. pgrep -V now gives the PCRE version number and date.
237    
238    7. Fixed bug: a zero repetition after a literal string (e.g. /abcde{0}/) was
239    causing the entire string to be ignored, instead of just the last character.
240    
241    8. If a pattern like /"([^\\"]+|\\.)*"/ is applied in the normal way to a
242    non-matching string, it can take a very, very long time, even for strings of
243    quite modest length, because of the nested recursion. PCRE now does better in
244    some of these cases. It does this by remembering the last required literal
245    character in the pattern, and pre-searching the subject to ensure it is present
246    before running the real match. In other words, it applies a heuristic to detect
247    some types of certain failure quickly, and in the above example, if presented
248    with a string that has no trailing " it gives "no match" very quickly.
249    
250    9. A new runtime option PCRE_NOTEMPTY causes null string matches to be ignored;
251    other alternatives are tried instead.
252    
253    
254    Version 2.06 09-Jun-99
255    ----------------------
256    
257    1. Change pcretest's output for amount of store used to show just the code
258    space, because the remainder (the data block) varies in size between 32-bit and
259    64-bit systems.
260    
261    2. Added an extra argument to pcre_exec() to supply an offset in the subject to
262    start matching at. This allows lookbehinds to work when searching for multiple
263    occurrences in a string.
264    
265    3. Added additional options to pcretest for testing multiple occurrences:
266    
267       /+   outputs the rest of the string that follows a match
268       /g   loops for multiple occurrences, using the new startoffset argument
269       /G   loops for multiple occurrences by passing an incremented pointer
270    
271    4. PCRE wasn't doing the "first character" optimization for patterns starting
272    with \b or \B, though it was doing it for other lookbehind assertions. That is,
273    it wasn't noticing that a match for a pattern such as /\bxyz/ has to start with
274    the letter 'x'. On long subject strings, this gives a significant speed-up.
275    
276    
277    Version 2.05 21-Apr-99
278    ----------------------
279    
280    1. Changed the type of magic_number from int to long int so that it works
281    properly on 16-bit systems.
282    
283    2. Fixed a bug which caused patterns starting with .* not to work correctly
284    when the subject string contained newline characters. PCRE was assuming
285    anchoring for such patterns in all cases, which is not correct because .* will
286    not pass a newline unless PCRE_DOTALL is set. It now assumes anchoring only if
287    DOTALL is set at top level; otherwise it knows that patterns starting with .*
288    must be retried after every newline in the subject.
289    
290    
291    Version 2.04 18-Feb-99
292    ----------------------
293    
294    1. For parenthesized subpatterns with repeats whose minimum was zero, the
295    computation of the store needed to hold the pattern was incorrect (too large).
296    If such patterns were nested a few deep, this could multiply and become a real
297    problem.
298    
299    2. Added /M option to pcretest to show the memory requirement of a specific
300    pattern. Made -m a synonym of -s (which does this globally) for compatibility.
301    
302    3. Subpatterns of the form (regex){n,m} (i.e. limited maximum) were being
303    compiled in such a way that the backtracking after subsequent failure was
304    pessimal. Something like (a){0,3} was compiled as (a)?(a)?(a)? instead of
305    ((a)((a)(a)?)?)? with disastrous performance if the maximum was of any size.
306    
307    
308    Version 2.03 02-Feb-99
309    ----------------------
310    
311    1. Fixed typo and small mistake in man page.
312    
313    2. Added 4th condition (GPL supersedes if conflict) and created separate
314    LICENCE file containing the conditions.
315    
316    3. Updated pcretest so that patterns such as /abc\/def/ work like they do in
317    Perl, that is the internal \ allows the delimiter to be included in the
318    pattern. Locked out the use of \ as a delimiter. If \ immediately follows
319    the final delimiter, add \ to the end of the pattern (to test the error).
320    
321    4. Added the convenience functions for extracting substrings after a successful
322    match. Updated pcretest to make it able to test these functions.
323    
324    
325    Version 2.02 14-Jan-99
326    ----------------------
327    
328    1. Initialized the working variables associated with each extraction so that
329    their saving and restoring doesn't refer to uninitialized store.
330    
331    2. Put dummy code into study.c in order to trick the optimizer of the IBM C
332    compiler for OS/2 into generating correct code. Apparently IBM isn't going to
333    fix the problem.
334    
335    3. Pcretest: the timing code wasn't using LOOPREPEAT for timing execution
336    calls, and wasn't printing the correct value for compiling calls. Increased the
337    default value of LOOPREPEAT, and the number of significant figures in the
338    times.
339    
340    4. Changed "/bin/rm" in the Makefile to "-rm" so it works on Windows NT.
341    
342    5. Renamed "deftables" as "dftables" to get it down to 8 characters, to avoid
343    a building problem on Windows NT with a FAT file system.
344    
345    
346    Version 2.01 21-Oct-98
347    ----------------------
348    
349    1. Changed the API for pcre_compile() to allow for the provision of a pointer
350    to character tables built by pcre_maketables() in the current locale. If NULL
351    is passed, the default tables are used.
352    
353    
354    Version 2.00 24-Sep-98
355    ----------------------
356    
357    1. Since the (>?) facility is in Perl 5.005, don't require PCRE_EXTRA to enable
358    it any more.
359    
360    2. Allow quantification of (?>) groups, and make it work correctly.
361    
362    3. The first character computation wasn't working for (?>) groups.
363    
364    4. Correct the implementation of \Z (it is permitted to match on the \n at the
365    end of the subject) and add 5.005's \z, which really does match only at the
366    very end of the subject.
367    
368    5. Remove the \X "cut" facility; Perl doesn't have it, and (?> is neater.
369    
370    6. Remove the ability to specify CASELESS, MULTILINE, DOTALL, and
371    DOLLAR_END_ONLY at runtime, to make it possible to implement the Perl 5.005
372    localized options. All options to pcre_study() were also removed.
373    
374    7. Add other new features from 5.005:
375    
376       $(?<=           positive lookbehind
377       $(?<!           negative lookbehind
378       (?imsx-imsx)    added the unsetting capability
379                       such a setting is global if at outer level; local otherwise
380       (?imsx-imsx:)   non-capturing groups with option setting
381       (?(cond)re|re)  conditional pattern matching
382    
383       A backreference to itself in a repeated group matches the previous
384       captured string.
385    
386    8. General tidying up of studying (both automatic and via "study")
387    consequential on the addition of new assertions.
388    
389    9. As in 5.005, unlimited repeated groups that could match an empty substring
390    are no longer faulted at compile time. Instead, the loop is forcibly broken at
391    runtime if any iteration does actually match an empty substring.
392    
393    10. Include the RunTest script in the distribution.
394    
395    11. Added tests from the Perl 5.005_02 distribution. This showed up a few
396    discrepancies, some of which were old and were also with respect to 5.004. They
397    have now been fixed.
398    
399    
400    Version 1.09 28-Apr-98
401    ----------------------
402    
403    1. A negated single character class followed by a quantifier with a minimum
404    value of one (e.g.  [^x]{1,6}  ) was not compiled correctly. This could lead to
405    program crashes, or just wrong answers. This did not apply to negated classes
406    containing more than one character, or to minima other than one.
407    
408    
409    Version 1.08 27-Mar-98
410    ----------------------
411    
412    1. Add PCRE_UNGREEDY to invert the greediness of quantifiers.
413    
414    2. Add (?U) and (?X) to set PCRE_UNGREEDY and PCRE_EXTRA respectively. The
415    latter must appear before anything that relies on it in the pattern.
416    
417    
418    Version 1.07 16-Feb-98
419    ----------------------
420    
421    1. A pattern such as /((a)*)*/ was not being diagnosed as in error (unlimited
422    repeat of a potentially empty string).
423    
424    
425    Version 1.06 23-Jan-98
426    ----------------------
427    
428    1. Added Markus Oberhumer's little patches for C++.
429    
430    2. Literal strings longer than 255 characters were broken.
431    
432    
433    Version 1.05 23-Dec-97
434    ----------------------
435    
436    1. Negated character classes containing more than one character were failing if
437    PCRE_CASELESS was set at run time.
438    
439    
440    Version 1.04 19-Dec-97
441    ----------------------
442    
443    1. Corrected the man page, where some "const" qualifiers had been omitted.
444    
445    2. Made debugging output print "{0,xxx}" instead of just "{,xxx}" to agree with
446    input syntax.
447    
448    3. Fixed memory leak which occurred when a regex with back references was
449    matched with an offsets vector that wasn't big enough. The temporary memory
450    that is used in this case wasn't being freed if the match failed.
451    
452    4. Tidied pcretest to ensure it frees memory that it gets.
453    
454    5. Temporary memory was being obtained in the case where the passed offsets
455    vector was exactly big enough.
456    
457    6. Corrected definition of offsetof() from change 5 below.
458    
459    7. I had screwed up change 6 below and broken the rules for the use of
460    setjmp(). Now fixed.
461    
462    
463    Version 1.03 18-Dec-97
464    ----------------------
465    
466    1. A erroneous regex with a missing opening parenthesis was correctly
467    diagnosed, but PCRE attempted to access brastack[-1], which could cause crashes
468    on some systems.
469    
470    2. Replaced offsetof(real_pcre, code) by offsetof(real_pcre, code[0]) because
471    it was reported that one broken compiler failed on the former because "code" is
472    also an independent variable.
473    
474    3. The erroneous regex a[]b caused an array overrun reference.
475    
476    4. A regex ending with a one-character negative class (e.g. /[^k]$/) did not
477    fail on data ending with that character. (It was going on too far, and checking
478    the next character, typically a binary zero.) This was specific to the
479    optimized code for single-character negative classes.
480    
481    5. Added a contributed patch from the TIN world which does the following:
482    
483      + Add an undef for memmove, in case the the system defines a macro for it.
484    
485      + Add a definition of offsetof(), in case there isn't one. (I don't know
486        the reason behind this - offsetof() is part of the ANSI standard - but
487        it does no harm).
488    
489      + Reduce the ifdef's in pcre.c using macro DPRINTF, thereby eliminating
490        most of the places where whitespace preceded '#'. I have given up and
491        allowed the remaining 2 cases to be at the margin.
492    
493      + Rename some variables in pcre to eliminate shadowing. This seems very
494        pedantic, but does no harm, of course.
495    
496    6. Moved the call to setjmp() into its own function, to get rid of warnings
497    from gcc -Wall, and avoided calling it at all unless PCRE_EXTRA is used.
498    
499    7. Constructs such as \d{8,} were compiling into the equivalent of
500    \d{8}\d{0,65527} instead of \d{8}\d* which didn't make much difference to the
501    outcome, but in this particular case used more store than had been allocated,
502    which caused the bug to be discovered because it threw up an internal error.
503    
504    8. The debugging code in both pcre and pcretest for outputting the compiled
505    form of a regex was going wrong in the case of back references followed by
506    curly-bracketed repeats.
507    
508    
509    Version 1.02 12-Dec-97
510    ----------------------
511    
512    1. Typos in pcre.3 and comments in the source fixed.
513    
514    2. Applied a contributed patch to get rid of places where it used to remove
515    'const' from variables, and fixed some signed/unsigned and uninitialized
516    variable warnings.
517    
518    3. Added the "runtest" target to Makefile.
519    
520    4. Set default compiler flag to -O2 rather than just -O.
521    
522    
523  Version 1.01 19-Nov-97  Version 1.01 19-Nov-97
524  ----------------------  ----------------------

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