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revision 29 by nigel, Sat Feb 24 21:38:53 2007 UTC revision 39 by nigel, Sat Feb 24 21:39:13 2007 UTC
# Line 2  ChangeLog for PCRE Line 2  ChangeLog for PCRE
2  ------------------  ------------------
5    Version 2.08 31-Aug-99
6    ----------------------
8    1. When startoffset was not zero and the pattern began with ".*", PCRE was not
9    trying to match at the startoffset position, but instead was moving forward to
10    the next newline as if a previous match had failed.
12    2. pcretest was not making use of PCRE_NOTEMPTY when repeating for /g and /G,
13    and could get into a loop if a null string was matched other than at the start
14    of the subject.
16    3. Added definitions of PCRE_MAJOR and PCRE_MINOR to pcre.h so the version can
17    be distinguished at compile time, and for completeness also added PCRE_DATE.
19    5. Added Paul Sokolovsky's minor changes to make it easy to compile a Win32 DLL
20    in GnuWin32 environments.
23    Version 2.07 29-Jul-99
24    ----------------------
26    1. The documentation is now supplied in plain text form and HTML as well as in
27    the form of man page sources.
29    2. C++ compilers don't like assigning (void *) values to other pointer types.
30    In particular this affects malloc(). Although there is no problem in Standard
31    C, I've put in casts to keep C++ compilers happy.
33    3. Typo on pcretest.c; a cast of (unsigned char *) in the POSIX regexec() call
34    should be (const char *).
36    4. If NOPOSIX is defined, pcretest.c compiles without POSIX support. This may
37    be useful for non-Unix systems who don't want to bother with the POSIX stuff.
38    However, I haven't made this a standard facility. The documentation doesn't
39    mention it, and the Makefile doesn't support it.
41    5. The Makefile now contains an "install" target, with editable destinations at
42    the top of the file. The pcretest program is not installed.
44    6. pgrep -V now gives the PCRE version number and date.
46    7. Fixed bug: a zero repetition after a literal string (e.g. /abcde{0}/) was
47    causing the entire string to be ignored, instead of just the last character.
49    8. If a pattern like /"([^\\"]+|\\.)*"/ is applied in the normal way to a
50    non-matching string, it can take a very, very long time, even for strings of
51    quite modest length, because of the nested recursion. PCRE now does better in
52    some of these cases. It does this by remembering the last required literal
53    character in the pattern, and pre-searching the subject to ensure it is present
54    before running the real match. In other words, it applies a heuristic to detect
55    some types of certain failure quickly, and in the above example, if presented
56    with a string that has no trailing " it gives "no match" very quickly.
58    9. A new runtime option PCRE_NOTEMPTY causes null string matches to be ignored;
59    other alternatives are tried instead.
62    Version 2.06 09-Jun-99
63    ----------------------
65    1. Change pcretest's output for amount of store used to show just the code
66    space, because the remainder (the data block) varies in size between 32-bit and
67    64-bit systems.
69    2. Added an extra argument to pcre_exec() to supply an offset in the subject to
70    start matching at. This allows lookbehinds to work when searching for multiple
71    occurrences in a string.
73    3. Added additional options to pcretest for testing multiple occurrences:
75       /+   outputs the rest of the string that follows a match
76       /g   loops for multiple occurrences, using the new startoffset argument
77       /G   loops for multiple occurrences by passing an incremented pointer
79    4. PCRE wasn't doing the "first character" optimization for patterns starting
80    with \b or \B, though it was doing it for other lookbehind assertions. That is,
81    it wasn't noticing that a match for a pattern such as /\bxyz/ has to start with
82    the letter 'x'. On long subject strings, this gives a significant speed-up.
85    Version 2.05 21-Apr-99
86    ----------------------
88    1. Changed the type of magic_number from int to long int so that it works
89    properly on 16-bit systems.
91    2. Fixed a bug which caused patterns starting with .* not to work correctly
92    when the subject string contained newline characters. PCRE was assuming
93    anchoring for such patterns in all cases, which is not correct because .* will
94    not pass a newline unless PCRE_DOTALL is set. It now assumes anchoring only if
95    DOTALL is set at top level; otherwise it knows that patterns starting with .*
96    must be retried after every newline in the subject.
99    Version 2.04 18-Feb-99
100    ----------------------
102    1. For parenthesized subpatterns with repeats whose minimum was zero, the
103    computation of the store needed to hold the pattern was incorrect (too large).
104    If such patterns were nested a few deep, this could multiply and become a real
105    problem.
107    2. Added /M option to pcretest to show the memory requirement of a specific
108    pattern. Made -m a synonym of -s (which does this globally) for compatibility.
110    3. Subpatterns of the form (regex){n,m} (i.e. limited maximum) were being
111    compiled in such a way that the backtracking after subsequent failure was
112    pessimal. Something like (a){0,3} was compiled as (a)?(a)?(a)? instead of
113    ((a)((a)(a)?)?)? with disastrous performance if the maximum was of any size.
116  Version 2.03 02-Feb-99  Version 2.03 02-Feb-99
117  ----------------------  ----------------------
119  1. Fixed typo and small mistake in man page.  1. Fixed typo and small mistake in man page.
121  2. Added 4th condition (GPL supersedes) and created separate LICENCE file.  2. Added 4th condition (GPL supersedes if conflict) and created separate
122    LICENCE file containing the conditions.
124  3. Updated pcretest so that patterns such as /abc\/def/ work like they do in  3. Updated pcretest so that patterns such as /abc\/def/ work like they do in
125  Perl, that is the internal \ allows the delimiter to be included in the  Perl, that is the internal \ allows the delimiter to be included in the

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