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revision 35 by nigel, Sat Feb 24 21:39:05 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 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  Version 2.06 09-Jun-99
159  ----------------------  ----------------------

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