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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4    Version 3.7 29-Oct-01
5    ---------------------
6    
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.
10    
11    
12    Version 3.6 23-Oct-01
13    ---------------------
14    
15    1. Crashed with /(sens|respons)e and \1ibility/ and "sense and sensibility" if
16    offsets passed as NULL with zero offset count.
17    
18    2. The config.guess and config.sub files had not been updated when I moved to
19    the latest autoconf.
20    
21    
22    Version 3.5 15-Aug-01
23    ---------------------
24    
25    1. Added some missing #if !defined NOPOSIX conditionals in pcretest.c that
26    had been forgotten.
27    
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.
31    
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.
37    
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.
42    
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.
48    
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).
51    
52    7. Upgraded Makefile.in to allow for compiling in a different directory from
53    the source directory.
54    
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.
58    
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.
62    
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().
66    
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.
70    
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.
74    
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.
77    
78    
79    Version 3.4 22-Aug-00
80    ---------------------
81    
82    1. Fixed typo in pcre.h: unsigned const char * changed to const unsigned char *.
83    
84    2. Diagnose condition (?(0) as an error instead of crashing on matching.
85    
86    
87    Version 3.3 01-Aug-00
88    ---------------------
89    
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.
93    
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.
96    
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.
101    
102    4. Add "make test" as a synonym for "make check". Corrected some comments in
103    the Makefile.
104    
105    5. Add $(DESTDIR)/ in front of all the paths in the "install" target in the
106    Makefile.
107    
108    6. Changed the name of pgrep to pcregrep, because Solaris has introduced a
109    command called pgrep for grepping around the active processes.
110    
111    7. Added the beginnings of support for UTF-8 character strings.
112    
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.)
117    
118    
119    Version 3.2 12-May-00
120    ---------------------
121    
122    This is purely a bug fixing release.
123    
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.
129    
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.
134    
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.
138    
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
141    
142      while ((c = *(++ptr)) != 0 && c != '\n');
143    to
144      while ((c = *(++ptr)) != 0 && c != '\n') ;
145    
146    Totally extraordinary, but if that's what it takes...
147    
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).
152    
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.
156    
157    
158    Version 3.1 09-Feb-00
159    ---------------------
160    
161    The only change in this release is the fixing of some bugs in Makefile.in for
162    the "install" target:
163    
164    (1) It was failing to install pcreposix.h.
165    
166    (2) It was overwriting the pcre.3 man page with the pcreposix.3 man page.
167    
168    
169    Version 3.0 01-Feb-00
170    ---------------------
171    
172    1. Add support for the /+ modifier to perltest (to output $` like it does in
173    pcretest).
174    
175    2. Add support for the /g modifier to perltest.
176    
177    3. Fix pcretest so that it behaves even more like Perl for /g when the pattern
178    matches null strings.
179    
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.
184    
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.
189    
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.
195    
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.
199    
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.
203    
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.
207    
208    10. Added experimental recursion feature (?R) to handle one common case that
209    Perl 5.6 will be able to do with (?p{...}).
210    
211    11. Added support for POSIX character classes like [:alpha:], which Perl is
212    adopting.
213    
214    
215    Version 2.08 31-Aug-99
216    ----------------------
217    
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.
221    
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.
225    
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.
228    
229    5. Added Paul Sokolovsky's minor changes to make it easy to compile a Win32 DLL
230    in GnuWin32 environments.
231    
232    
233    Version 2.07 29-Jul-99
234    ----------------------
235    
236    1. The documentation is now supplied in plain text form and HTML as well as in
237    the form of man page sources.
238    
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.
242    
243    3. Typo on pcretest.c; a cast of (unsigned char *) in the POSIX regexec() call
244    should be (const char *).
245    
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.
250    
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.
253    
254    6. pgrep -V now gives the PCRE version number and date.
255    
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.
258    
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.
267    
268    9. A new runtime option PCRE_NOTEMPTY causes null string matches to be ignored;
269    other alternatives are tried instead.
270    
271    
272    Version 2.06 09-Jun-99
273    ----------------------
274    
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.
278    
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.
282    
283    3. Added additional options to pcretest for testing multiple occurrences:
284    
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
288    
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.
293    
294    
295    Version 2.05 21-Apr-99
296    ----------------------
297    
298    1. Changed the type of magic_number from int to long int so that it works
299    properly on 16-bit systems.
300    
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.
307    
308    
309    Version 2.04 18-Feb-99
310    ----------------------
311    
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.
316    
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.
319    
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.
324    
325    
326    Version 2.03 02-Feb-99
327    ----------------------
328    
329    1. Fixed typo and small mistake in man page.
330    
331    2. Added 4th condition (GPL supersedes if conflict) and created separate
332    LICENCE file containing the conditions.
333    
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).
338    
339    4. Added the convenience functions for extracting substrings after a successful
340    match. Updated pcretest to make it able to test these functions.
341    
342    
343    Version 2.02 14-Jan-99
344    ----------------------
345    
346    1. Initialized the working variables associated with each extraction so that
347    their saving and restoring doesn't refer to uninitialized store.
348    
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.
352    
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.
357    
358    4. Changed "/bin/rm" in the Makefile to "-rm" so it works on Windows NT.
359    
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.
362    
363    
364    Version 2.01 21-Oct-98
365    ----------------------
366    
367    1. Changed the API for pcre_compile() to allow for the provision of a pointer
368    to character tables built by pcre_maketables() in the current locale. If NULL
369    is passed, the default tables are used.
370    
371    
372    Version 2.00 24-Sep-98
373    ----------------------
374    
375    1. Since the (>?) facility is in Perl 5.005, don't require PCRE_EXTRA to enable
376    it any more.
377    
378    2. Allow quantification of (?>) groups, and make it work correctly.
379    
380    3. The first character computation wasn't working for (?>) groups.
381    
382    4. Correct the implementation of \Z (it is permitted to match on the \n at the
383    end of the subject) and add 5.005's \z, which really does match only at the
384    very end of the subject.
385    
386    5. Remove the \X "cut" facility; Perl doesn't have it, and (?> is neater.
387    
388    6. Remove the ability to specify CASELESS, MULTILINE, DOTALL, and
389    DOLLAR_END_ONLY at runtime, to make it possible to implement the Perl 5.005
390    localized options. All options to pcre_study() were also removed.
391    
392    7. Add other new features from 5.005:
393    
394       $(?<=           positive lookbehind
395       $(?<!           negative lookbehind
396       (?imsx-imsx)    added the unsetting capability
397                       such a setting is global if at outer level; local otherwise
398       (?imsx-imsx:)   non-capturing groups with option setting
399       (?(cond)re|re)  conditional pattern matching
400    
401       A backreference to itself in a repeated group matches the previous
402       captured string.
403    
404    8. General tidying up of studying (both automatic and via "study")
405    consequential on the addition of new assertions.
406    
407    9. As in 5.005, unlimited repeated groups that could match an empty substring
408    are no longer faulted at compile time. Instead, the loop is forcibly broken at
409    runtime if any iteration does actually match an empty substring.
410    
411    10. Include the RunTest script in the distribution.
412    
413    11. Added tests from the Perl 5.005_02 distribution. This showed up a few
414    discrepancies, some of which were old and were also with respect to 5.004. They
415    have now been fixed.
416    
417    
418    Version 1.09 28-Apr-98
419    ----------------------
420    
421    1. A negated single character class followed by a quantifier with a minimum
422    value of one (e.g.  [^x]{1,6}  ) was not compiled correctly. This could lead to
423    program crashes, or just wrong answers. This did not apply to negated classes
424    containing more than one character, or to minima other than one.
425    
426    
427    Version 1.08 27-Mar-98
428    ----------------------
429    
430    1. Add PCRE_UNGREEDY to invert the greediness of quantifiers.
431    
432    2. Add (?U) and (?X) to set PCRE_UNGREEDY and PCRE_EXTRA respectively. The
433    latter must appear before anything that relies on it in the pattern.
434    
435    
436    Version 1.07 16-Feb-98
437    ----------------------
438    
439    1. A pattern such as /((a)*)*/ was not being diagnosed as in error (unlimited
440    repeat of a potentially empty string).
441    
442    
443    Version 1.06 23-Jan-98
444    ----------------------
445    
446    1. Added Markus Oberhumer's little patches for C++.
447    
448    2. Literal strings longer than 255 characters were broken.
449    
450    
451    Version 1.05 23-Dec-97
452    ----------------------
453    
454    1. Negated character classes containing more than one character were failing if
455    PCRE_CASELESS was set at run time.
456    
457    
458    Version 1.04 19-Dec-97
459    ----------------------
460    
461    1. Corrected the man page, where some "const" qualifiers had been omitted.
462    
463    2. Made debugging output print "{0,xxx}" instead of just "{,xxx}" to agree with
464    input syntax.
465    
466    3. Fixed memory leak which occurred when a regex with back references was
467    matched with an offsets vector that wasn't big enough. The temporary memory
468    that is used in this case wasn't being freed if the match failed.
469    
470    4. Tidied pcretest to ensure it frees memory that it gets.
471    
472    5. Temporary memory was being obtained in the case where the passed offsets
473    vector was exactly big enough.
474    
475    6. Corrected definition of offsetof() from change 5 below.
476    
477    7. I had screwed up change 6 below and broken the rules for the use of
478    setjmp(). Now fixed.
479    
480    
481  Version 1.03 18-Dec-97  Version 1.03 18-Dec-97
482  ----------------------  ----------------------
# Line 39  optimized code for single-character nega Line 515  optimized code for single-character nega
515  from gcc -Wall, and avoided calling it at all unless PCRE_EXTRA is used.  from gcc -Wall, and avoided calling it at all unless PCRE_EXTRA is used.
516    
517  7. Constructs such as \d{8,} were compiling into the equivalent of  7. Constructs such as \d{8,} were compiling into the equivalent of
518  \d{8}\d{65527} instead of \d{8}\d* which didn't make much difference to the  \d{8}\d{0,65527} instead of \d{8}\d* which didn't make much difference to the
519  outcome, but in this particular case used more store than had been allocated,  outcome, but in this particular case used more store than had been allocated,
520  which caused the bug to be discovered because it threw up an internal error.  which caused the bug to be discovered because it threw up an internal error.
521    

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