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revision 21 by nigel, Sat Feb 24 21:38:37 2007 UTC revision 47 by nigel, Sat Feb 24 21:39:29 2007 UTC
# Line 2  ChangeLog for PCRE Line 2  ChangeLog for PCRE
2  ------------------  ------------------
5  Version 1.09 28 Apr-98  Version 3.2 12-May-00
6    ---------------------
8    This is purely a bug fixing release.
10    1. If the pattern /((Z)+|A)*/ was matched agained ZABCDEFG it matched Z instead
11    of ZA. This was just one example of several cases that could provoke this bug,
12    which was introduced by change 9 of version 2.00. The code for breaking
13    infinite loops after an iteration that matches an empty string was't working
14    correctly.
16    2. The pcretest program was not imitating Perl correctly for the pattern /a*/g
17    when matched against abbab (for example). After matching an empty string, it
18    wasn't forcing anchoring when setting PCRE_NOTEMPTY for the next attempt; this
19    caused it to match further down the string than it should.
21    3. The code contained an inclusion of sys/types.h. It isn't clear why this
22    was there because it doesn't seem to be needed, and it causes trouble on some
23    systems, as it is not a Standard C header. It has been removed.
25    4. Made 4 silly changes to the source to avoid stupid compiler warnings that
26    were reported on the Macintosh. The changes were from
28      while ((c = *(++ptr)) != 0 && c != '\n');
29    to
30      while ((c = *(++ptr)) != 0 && c != '\n') ;
32    Totally extraordinary, but if that's what it takes...
34    5. PCRE is being used in one environment where neither memmove() nor bcopy() is
35    available. Added HAVE_BCOPY and an autoconf test for it; if neither
36    HAVE_MEMMOVE nor HAVE_BCOPY is set, use a built-in emulation function which
37    assumes the way PCRE uses memmove() (always moving upwards).
39    6. PCRE is being used in one environment where strchr() is not available. There
40    was only one use in pcre.c, and writing it out to avoid strchr() probably gives
41    faster code anyway.
44    Version 3.1 09-Feb-00
45    ---------------------
47    The only change in this release is the fixing of some bugs in Makefile.in for
48    the "install" target:
50    (1) It was failing to install pcreposix.h.
52    (2) It was overwriting the pcre.3 man page with the pcreposix.3 man page.
55    Version 3.0 01-Feb-00
56    ---------------------
58    1. Add support for the /+ modifier to perltest (to output $` like it does in
59    pcretest).
61    2. Add support for the /g modifier to perltest.
63    3. Fix pcretest so that it behaves even more like Perl for /g when the pattern
64    matches null strings.
66    4. Fix perltest so that it doesn't do unwanted things when fed an empty
67    pattern. Perl treats empty patterns specially - it reuses the most recent
68    pattern, which is not what we want. Replace // by /(?#)/ in order to avoid this
69    effect.
71    5. The POSIX interface was broken in that it was just handing over the POSIX
72    captured string vector to pcre_exec(), but (since release 2.00) PCRE has
73    required a bigger vector, with some working space on the end. This means that
74    the POSIX wrapper now has to get and free some memory, and copy the results.
76    6. Added some simple autoconf support, placing the test data and the
77    documentation in separate directories, re-organizing some of the
78    information files, and making it build pcre-config (a GNU standard). Also added
79    libtool support for building PCRE as a shared library, which is now the
80    default.
82    7. Got rid of the leading zero in the definition of PCRE_MINOR because 08 and
83    09 are not valid octal constants. Single digits will be used for minor values
84    less than 10.
86    8. Defined REG_EXTENDED and REG_NOSUB as zero in the POSIX header, so that
87    existing programs that set these in the POSIX interface can use PCRE without
88    modification.
90    9. Added a new function, pcre_fullinfo() with an extensible interface. It can
91    return all that pcre_info() returns, plus additional data. The pcre_info()
92    function is retained for compatibility, but is considered to be obsolete.
94    10. Added experimental recursion feature (?R) to handle one common case that
95    Perl 5.6 will be able to do with (?p{...}).
97    11. Added support for POSIX character classes like [:alpha:], which Perl is
98    adopting.
101    Version 2.08 31-Aug-99
102    ----------------------
104    1. When startoffset was not zero and the pattern began with ".*", PCRE was not
105    trying to match at the startoffset position, but instead was moving forward to
106    the next newline as if a previous match had failed.
108    2. pcretest was not making use of PCRE_NOTEMPTY when repeating for /g and /G,
109    and could get into a loop if a null string was matched other than at the start
110    of the subject.
112    3. Added definitions of PCRE_MAJOR and PCRE_MINOR to pcre.h so the version can
113    be distinguished at compile time, and for completeness also added PCRE_DATE.
115    5. Added Paul Sokolovsky's minor changes to make it easy to compile a Win32 DLL
116    in GnuWin32 environments.
119    Version 2.07 29-Jul-99
120    ----------------------
122    1. The documentation is now supplied in plain text form and HTML as well as in
123    the form of man page sources.
125    2. C++ compilers don't like assigning (void *) values to other pointer types.
126    In particular this affects malloc(). Although there is no problem in Standard
127    C, I've put in casts to keep C++ compilers happy.
129    3. Typo on pcretest.c; a cast of (unsigned char *) in the POSIX regexec() call
130    should be (const char *).
132    4. If NOPOSIX is defined, pcretest.c compiles without POSIX support. This may
133    be useful for non-Unix systems who don't want to bother with the POSIX stuff.
134    However, I haven't made this a standard facility. The documentation doesn't
135    mention it, and the Makefile doesn't support it.
137    5. The Makefile now contains an "install" target, with editable destinations at
138    the top of the file. The pcretest program is not installed.
140    6. pgrep -V now gives the PCRE version number and date.
142    7. Fixed bug: a zero repetition after a literal string (e.g. /abcde{0}/) was
143    causing the entire string to be ignored, instead of just the last character.
145    8. If a pattern like /"([^\\"]+|\\.)*"/ is applied in the normal way to a
146    non-matching string, it can take a very, very long time, even for strings of
147    quite modest length, because of the nested recursion. PCRE now does better in
148    some of these cases. It does this by remembering the last required literal
149    character in the pattern, and pre-searching the subject to ensure it is present
150    before running the real match. In other words, it applies a heuristic to detect
151    some types of certain failure quickly, and in the above example, if presented
152    with a string that has no trailing " it gives "no match" very quickly.
154    9. A new runtime option PCRE_NOTEMPTY causes null string matches to be ignored;
155    other alternatives are tried instead.
158    Version 2.06 09-Jun-99
159    ----------------------
161    1. Change pcretest's output for amount of store used to show just the code
162    space, because the remainder (the data block) varies in size between 32-bit and
163    64-bit systems.
165    2. Added an extra argument to pcre_exec() to supply an offset in the subject to
166    start matching at. This allows lookbehinds to work when searching for multiple
167    occurrences in a string.
169    3. Added additional options to pcretest for testing multiple occurrences:
171       /+   outputs the rest of the string that follows a match
172       /g   loops for multiple occurrences, using the new startoffset argument
173       /G   loops for multiple occurrences by passing an incremented pointer
175    4. PCRE wasn't doing the "first character" optimization for patterns starting
176    with \b or \B, though it was doing it for other lookbehind assertions. That is,
177    it wasn't noticing that a match for a pattern such as /\bxyz/ has to start with
178    the letter 'x'. On long subject strings, this gives a significant speed-up.
181    Version 2.05 21-Apr-99
182    ----------------------
184    1. Changed the type of magic_number from int to long int so that it works
185    properly on 16-bit systems.
187    2. Fixed a bug which caused patterns starting with .* not to work correctly
188    when the subject string contained newline characters. PCRE was assuming
189    anchoring for such patterns in all cases, which is not correct because .* will
190    not pass a newline unless PCRE_DOTALL is set. It now assumes anchoring only if
191    DOTALL is set at top level; otherwise it knows that patterns starting with .*
192    must be retried after every newline in the subject.
195    Version 2.04 18-Feb-99
196    ----------------------
198    1. For parenthesized subpatterns with repeats whose minimum was zero, the
199    computation of the store needed to hold the pattern was incorrect (too large).
200    If such patterns were nested a few deep, this could multiply and become a real
201    problem.
203    2. Added /M option to pcretest to show the memory requirement of a specific
204    pattern. Made -m a synonym of -s (which does this globally) for compatibility.
206    3. Subpatterns of the form (regex){n,m} (i.e. limited maximum) were being
207    compiled in such a way that the backtracking after subsequent failure was
208    pessimal. Something like (a){0,3} was compiled as (a)?(a)?(a)? instead of
209    ((a)((a)(a)?)?)? with disastrous performance if the maximum was of any size.
212    Version 2.03 02-Feb-99
213    ----------------------
215    1. Fixed typo and small mistake in man page.
217    2. Added 4th condition (GPL supersedes if conflict) and created separate
218    LICENCE file containing the conditions.
220    3. Updated pcretest so that patterns such as /abc\/def/ work like they do in
221    Perl, that is the internal \ allows the delimiter to be included in the
222    pattern. Locked out the use of \ as a delimiter. If \ immediately follows
223    the final delimiter, add \ to the end of the pattern (to test the error).
225    4. Added the convenience functions for extracting substrings after a successful
226    match. Updated pcretest to make it able to test these functions.
229    Version 2.02 14-Jan-99
230    ----------------------
232    1. Initialized the working variables associated with each extraction so that
233    their saving and restoring doesn't refer to uninitialized store.
235    2. Put dummy code into study.c in order to trick the optimizer of the IBM C
236    compiler for OS/2 into generating correct code. Apparently IBM isn't going to
237    fix the problem.
239    3. Pcretest: the timing code wasn't using LOOPREPEAT for timing execution
240    calls, and wasn't printing the correct value for compiling calls. Increased the
241    default value of LOOPREPEAT, and the number of significant figures in the
242    times.
244    4. Changed "/bin/rm" in the Makefile to "-rm" so it works on Windows NT.
246    5. Renamed "deftables" as "dftables" to get it down to 8 characters, to avoid
247    a building problem on Windows NT with a FAT file system.
250    Version 2.01 21-Oct-98
251    ----------------------
253    1. Changed the API for pcre_compile() to allow for the provision of a pointer
254    to character tables built by pcre_maketables() in the current locale. If NULL
255    is passed, the default tables are used.
258    Version 2.00 24-Sep-98
259    ----------------------
261    1. Since the (>?) facility is in Perl 5.005, don't require PCRE_EXTRA to enable
262    it any more.
264    2. Allow quantification of (?>) groups, and make it work correctly.
266    3. The first character computation wasn't working for (?>) groups.
268    4. Correct the implementation of \Z (it is permitted to match on the \n at the
269    end of the subject) and add 5.005's \z, which really does match only at the
270    very end of the subject.
272    5. Remove the \X "cut" facility; Perl doesn't have it, and (?> is neater.
274    6. Remove the ability to specify CASELESS, MULTILINE, DOTALL, and
275    DOLLAR_END_ONLY at runtime, to make it possible to implement the Perl 5.005
276    localized options. All options to pcre_study() were also removed.
278    7. Add other new features from 5.005:
280       $(?<=           positive lookbehind
281       $(?<!           negative lookbehind
282       (?imsx-imsx)    added the unsetting capability
283                       such a setting is global if at outer level; local otherwise
284       (?imsx-imsx:)   non-capturing groups with option setting
285       (?(cond)re|re)  conditional pattern matching
287       A backreference to itself in a repeated group matches the previous
288       captured string.
290    8. General tidying up of studying (both automatic and via "study")
291    consequential on the addition of new assertions.
293    9. As in 5.005, unlimited repeated groups that could match an empty substring
294    are no longer faulted at compile time. Instead, the loop is forcibly broken at
295    runtime if any iteration does actually match an empty substring.
297    10. Include the RunTest script in the distribution.
299    11. Added tests from the Perl 5.005_02 distribution. This showed up a few
300    discrepancies, some of which were old and were also with respect to 5.004. They
301    have now been fixed.
304    Version 1.09 28-Apr-98
305  ----------------------  ----------------------
307  1. A negated single character class followed by a quantifier with a minimum  1. A negated single character class followed by a quantifier with a minimum

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