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revision 25 by nigel, Sat Feb 24 21:38:45 2007 UTC revision 31 by nigel, Sat Feb 24 21:38:57 2007 UTC
# Line 2  ChangeLog for PCRE Line 2  ChangeLog for PCRE
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3    
4    
5    Version 2.04 18-Feb-99
6    ----------------------
7    
8    1. For parenthesized subpatterns with repeats whose minimum was zero, the
9    computation of the store needed to hold the pattern was incorrect (too large).
10    If such patterns were nested a few deep, this could multiply and become a real
11    problem.
12    
13    2. Added /M option to pcretest to show the memory requirement of a specific
14    pattern. Made -m a synonym of -s (which does this globally) for compatibility.
15    
16    3. Subpatterns of the form (regex){n,m} (i.e. limited maximum) were being
17    compiled in such a way that the backtracking after subsequent failure was
18    pessimal. Something like (a){0,3} was compiled as (a)?(a)?(a)? instead of
19    ((a)((a)(a)?)?)? with disastrous performance if the maximum was of any size.
20    
21    
22    Version 2.03 02-Feb-99
23    ----------------------
24    
25    1. Fixed typo and small mistake in man page.
26    
27    2. Added 4th condition (GPL supersedes if conflict) and created separate
28    LICENCE file containing the conditions.
29    
30    3. Updated pcretest so that patterns such as /abc\/def/ work like they do in
31    Perl, that is the internal \ allows the delimiter to be included in the
32    pattern. Locked out the use of \ as a delimiter. If \ immediately follows
33    the final delimiter, add \ to the end of the pattern (to test the error).
34    
35    4. Added the convenience functions for extracting substrings after a successful
36    match. Updated pcretest to make it able to test these functions.
37    
38    
39    Version 2.02 14-Jan-99
40    ----------------------
41    
42    1. Initialized the working variables associated with each extraction so that
43    their saving and restoring doesn't refer to uninitialized store.
44    
45    2. Put dummy code into study.c in order to trick the optimizer of the IBM C
46    compiler for OS/2 into generating correct code. Apparently IBM isn't going to
47    fix the problem.
48    
49    3. Pcretest: the timing code wasn't using LOOPREPEAT for timing execution
50    calls, and wasn't printing the correct value for compiling calls. Increased the
51    default value of LOOPREPEAT, and the number of significant figures in the
52    times.
53    
54    4. Changed "/bin/rm" in the Makefile to "-rm" so it works on Windows NT.
55    
56    5. Renamed "deftables" as "dftables" to get it down to 8 characters, to avoid
57    a building problem on Windows NT with a FAT file system.
58    
59    
60  Version 2.01 21-Oct-98  Version 2.01 21-Oct-98
61  ----------------------  ----------------------
62    

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