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revision 33 by nigel, Sat Feb 24 21:39:01 2007 UTC revision 37 by nigel, Sat Feb 24 21:39:09 2007 UTC
# Line 2  ChangeLog for PCRE Line 2  ChangeLog for PCRE
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5    Version 2.07 29-Jul-99
6    ----------------------
8    1. The documentation is now supplied in plain text form and HTML as well as in
9    the form of man page sources.
11    2. C++ compilers don't like assigning (void *) values to other pointer types.
12    In particular this affects malloc(). Although there is no problem in Standard
13    C, I've put in casts to keep C++ compilers happy.
15    3. Typo on pcretest.c; a cast of (unsigned char *) in the POSIX regexec() call
16    should be (const char *).
18    4. If NOPOSIX is defined, pcretest.c compiles without POSIX support. This may
19    be useful for non-Unix systems who don't want to bother with the POSIX stuff.
20    However, I haven't made this a standard facility. The documentation doesn't
21    mention it, and the Makefile doesn't support it.
23    5. The Makefile now contains an "install" target, with editable destinations at
24    the top of the file. The pcretest program is not installed.
26    6. pgrep -V now gives the PCRE version number and date.
28    7. Fixed bug: a zero repetition after a literal string (e.g. /abcde{0}/) was
29    causing the entire string to be ignored, instead of just the last character.
31    8. If a pattern like /"([^\\"]+|\\.)*"/ is applied in the normal way to a
32    non-matching string, it can take a very, very long time, even for strings of
33    quite modest length, because of the nested recursion. PCRE now does better in
34    some of these cases. It does this by remembering the last required literal
35    character in the pattern, and pre-searching the subject to ensure it is present
36    before running the real match. In other words, it applies a heuristic to detect
37    some types of certain failure quickly, and in the above example, if presented
38    with a string that has no trailing " it gives "no match" very quickly.
40    9. A new runtime option PCRE_NOTEMPTY causes null string matches to be ignored;
41    other alternatives are tried instead.
44    Version 2.06 09-Jun-99
45    ----------------------
47    1. Change pcretest's output for amount of store used to show just the code
48    space, because the remainder (the data block) varies in size between 32-bit and
49    64-bit systems.
51    2. Added an extra argument to pcre_exec() to supply an offset in the subject to
52    start matching at. This allows lookbehinds to work when searching for multiple
53    occurrences in a string.
55    3. Added additional options to pcretest for testing multiple occurrences:
57       /+   outputs the rest of the string that follows a match
58       /g   loops for multiple occurrences, using the new startoffset argument
59       /G   loops for multiple occurrences by passing an incremented pointer
61    4. PCRE wasn't doing the "first character" optimization for patterns starting
62    with \b or \B, though it was doing it for other lookbehind assertions. That is,
63    it wasn't noticing that a match for a pattern such as /\bxyz/ has to start with
64    the letter 'x'. On long subject strings, this gives a significant speed-up.
67  Version 2.05 21-Apr-99  Version 2.05 21-Apr-99
68  ----------------------  ----------------------

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