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revision 687 by ph10, Tue Sep 6 16:09:43 2011 UTC revision 691 by ph10, Sun Sep 11 14:31:21 2011 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.20  Version 8.20 12-Sep-2011
5  ------------  ------------------------
6    
7  1. Change 37 of 8.13 broke patterns like [:a]...[b:] because it thought it had  1. Change 37 of 8.13 broke patterns like [:a]...[b:] because it thought it had
8     a POSIX class. After further experiments with Perl, which convinced me that     a POSIX class. After further experiments with Perl, which convinced me that
9     Perl has bugs and confusions, a closing square bracket is no longer allowed     Perl has bugs and confusions, a closing square bracket is no longer allowed
10     in a POSIX name.     in a POSIX name. This bug also affected patterns with classes that started
11       with full stops.
12    
13  2. If a pattern such as /(a)b|ac/ is matched against "ac", there is no captured  2. If a pattern such as /(a)b|ac/ is matched against "ac", there is no captured
14     substring, but while checking the failing first alternative, substring 1 is     substring, but while checking the failing first alternative, substring 1 is
15     temporarily captured. If the output vector supplied to pcre_exec() was not     temporarily captured. If the output vector supplied to pcre_exec() was not
16     big enough for this capture, the yield of the function was still zero     big enough for this capture, the yield of the function was still zero
17     ("insufficient space for captured substrings"). This cannot be totally fixed     ("insufficient space for captured substrings"). This cannot be totally fixed
18     without adding another stack variable, which seems a lot of expense for a     without adding another stack variable, which seems a lot of expense for a
19     edge case. However, I have improved the situation in cases such as     edge case. However, I have improved the situation in cases such as
20     /(a)(b)x|abc/ matched against "abc", where the return code indicates that     /(a)(b)x|abc/ matched against "abc", where the return code indicates that
21     fewer than the maximum number of slots in the ovector have been set.     fewer than the maximum number of slots in the ovector have been set.
22    
23  3. Related to (2) above: when there are more back references in a pattern than  3. Related to (2) above: when there are more back references in a pattern than
24     slots in the output vector, pcre_exec() uses temporary memory during     slots in the output vector, pcre_exec() uses temporary memory during
25     matching, and copies in the captures as far as possible afterwards. It was     matching, and copies in the captures as far as possible afterwards. It was
26     using the entire output vector, but this conflicts with the specification     using the entire output vector, but this conflicts with the specification
27     that only 2/3 is used for passing back captured substrings. Now it uses only     that only 2/3 is used for passing back captured substrings. Now it uses only
28     the first 2/3, for compatibility. This is, of course, another edge case.     the first 2/3, for compatibility. This is, of course, another edge case.
29    
30  4. Zoltan Herczeg's just-in-time compiler support has been integrated into the  4. Zoltan Herczeg's just-in-time compiler support has been integrated into the
31     main code base, and can be used by building with --enable-jit. When this is     main code base, and can be used by building with --enable-jit. When this is
32     done, pcregrep automatically uses it unless --disable-pcregrep-jit or the     done, pcregrep automatically uses it unless --disable-pcregrep-jit or the
33     runtime --no-jit option is given.     runtime --no-jit option is given.
34    
35  5. When the number of matches in a pcre_dfa_exec() run exactly filled the  5. When the number of matches in a pcre_dfa_exec() run exactly filled the
36     ovector, the return from the function was zero, implying that there were     ovector, the return from the function was zero, implying that there were
37     other matches that did not fit. The correct "exactly full" value is now     other matches that did not fit. The correct "exactly full" value is now
38     returned.     returned.
39    
40  6. If a subpattern that was called recursively or as a subroutine contained  6. If a subpattern that was called recursively or as a subroutine contained
41     (*PRUNE) or any other control that caused it to give a non-standard return,     (*PRUNE) or any other control that caused it to give a non-standard return,
42     invalid errors such as "Error -26 (nested recursion at the same subject     invalid errors such as "Error -26 (nested recursion at the same subject
43     position)" or even infinite loops could occur.     position)" or even infinite loops could occur.
44    
45    
46  Version 8.13 16-Aug-2011  Version 8.13 16-Aug-2011

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