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revision 544 by ph10, Tue Jun 15 17:20:55 2010 UTC revision 566 by ph10, Wed Nov 3 18:32:55 2010 UTC
# Line 1  Line 1 
1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.10 03-Jun-2010  Version 8.11 10-Oct-2010
5    ------------------------
6    
7    1.  (*THEN) was not working properly if there were untried alternatives prior
8        to it in the current branch. For example, in ((a|b)(*THEN)(*F)|c..) it
9        backtracked to try for "b" instead of moving to the next alternative branch
10        at the same level (in this case, to look for "c"). The Perl documentation
11        is clear that when (*THEN) is backtracked onto, it goes to the "next
12        alternative in the innermost enclosing group".
13    
14    2.  (*COMMIT) was not overriding (*THEN), as it does in Perl. In a pattern
15        such as   (A(*COMMIT)B(*THEN)C|D)  any failure after matching A should
16        result in overall failure. Similarly, (*COMMIT) now overrides (*PRUNE) and
17        (*SKIP), (*SKIP) overrides (*PRUNE) and (*THEN), and (*PRUNE) overrides
18        (*THEN).
19    
20    3.  If \s appeared in a character class, it removed the VT character from
21        the class, even if it had been included by some previous item, for example
22        in [\x00-\xff\s]. (This was a bug related to the fact that VT is not part
23        of \s, but is part of the POSIX "space" class.)
24    
25    4.  A partial match never returns an empty string (because you can always
26        match an empty string at the end of the subject); however the checking for
27        an empty string was starting at the "start of match" point. This has been
28        changed to the "earliest inspected character" point, because the returned
29        data for a partial match starts at this character. This means that, for
30        example, /(?<=abc)def/ gives a partial match for the subject "abc"
31        (previously it gave "no match").
32    
33    5.  Changes have been made to the way PCRE_PARTIAL_HARD affects the matching
34        of $, \z, \Z, \b, and \B. If the match point is at the end of the string,
35        previously a full match would be given. However, setting PCRE_PARTIAL_HARD
36        has an implication that the given string is incomplete (because a partial
37        match is preferred over a full match). For this reason, these items now
38        give a partial match in this situation. [Aside: previously, the one case
39        /t\b/ matched against "cat" with PCRE_PARTIAL_HARD set did return a partial
40        match rather than a full match, which was wrong by the old rules, but is
41        now correct.]
42    
43    6.  There was a bug in the handling of #-introduced comments, recognized when
44        PCRE_EXTENDED is set, when PCRE_NEWLINE_ANY and PCRE_UTF8 were also set.
45        If a UTF-8 multi-byte character included the byte 0x85 (e.g. +U0445, whose
46        UTF-8 encoding is 0xd1,0x85), this was misinterpreted as a newline when
47        scanning for the end of the comment. (*Character* 0x85 is an "any" newline,
48        but *byte* 0x85 is not, in UTF-8 mode). This bug was present in several
49        places in pcre_compile().
50    
51    7.  Related to (6) above, when pcre_compile() was skipping #-introduced
52        comments when looking ahead for named forward references to subpatterns,
53        the only newline sequence it recognized was NL. It now handles newlines
54        according to the set newline convention.
55    
56    8.  SunOS4 doesn't have strerror() or strtoul(); pcregrep dealt with the
57        former, but used strtoul(), whereas pcretest avoided strtoul() but did not
58        cater for a lack of strerror(). These oversights have been fixed.
59    
60    9.  Added --match-limit and --recursion-limit to pcregrep.
61    
62    10. Added two casts needed to build with Visual Studio when NO_RECURSE is set.
63    
64    11. When the -o option was used, pcregrep was setting a return code of 1, even
65        when matches were found, and --line-buffered was not being honoured.
66    
67    12. Added an optional parentheses number to the -o and --only-matching options
68        of pcregrep.
69    
70    13. Imitating Perl's /g action for multiple matches is tricky when the pattern
71        can match an empty string. The code to do it in pcretest and pcredemo
72        needed fixing:
73    
74        (a) When the newline convention was "crlf", pcretest got it wrong, skipping
75            only one byte after an empty string match just before CRLF (this case
76            just got forgotten; "any" and "anycrlf" were OK).
77    
78        (b) The pcretest code also had a bug, causing it to loop forever in UTF-8
79            mode when an empty string match preceded an ASCII character followed by
80            a non-ASCII character. (The code for advancing by one character rather
81            than one byte was nonsense.)
82    
83        (c) The pcredemo.c sample program did not have any code at all to handle
84            the cases when CRLF is a valid newline sequence.
85    
86    
87    Version 8.10 25-Jun-2010
88  ------------------------  ------------------------
89    
90  1.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and  1.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and
# Line 42  Version 8.10 03-Jun-2010 Line 125  Version 8.10 03-Jun-2010
125  11. In UTF-8 mode, if a pattern that was compiled with PCRE_CASELESS was  11. In UTF-8 mode, if a pattern that was compiled with PCRE_CASELESS was
126      studied, and the match started with a letter with a code point greater than      studied, and the match started with a letter with a code point greater than
127      127 whose first byte was different to the first byte of the other case of      127 whose first byte was different to the first byte of the other case of
128      the letter, the other case of this starting letter was not recognized      the letter, the other case of this starting letter was not recognized
129      (#976).      (#976).
130    
131  12. If a pattern that was studied started with a repeated Unicode property  12. If a pattern that was studied started with a repeated Unicode property
# Line 68  Version 8.10 03-Jun-2010 Line 151  Version 8.10 03-Jun-2010
151    
152  17. Added a check for running out of memory when PCRE is compiled with  17. Added a check for running out of memory when PCRE is compiled with
153      --disable-stack-for-recursion (#990).      --disable-stack-for-recursion (#990).
154    
155  18. If the last data line in a file for pcretest does not have a newline on  18. If the last data line in a file for pcretest does not have a newline on
156      the end, a newline was missing in the output.      the end, a newline was missing in the output.
157    
158  19. The default pcre_chartables.c file recognizes only ASCII characters (values  19. The default pcre_chartables.c file recognizes only ASCII characters (values
159      less than 128) in its various bitmaps. However, there is a facility for      less than 128) in its various bitmaps. However, there is a facility for
160      generating tables according to the current locale when PCRE is compiled. It      generating tables according to the current locale when PCRE is compiled. It
161      turns out that in some environments, 0x85 and 0xa0, which are Unicode space      turns out that in some environments, 0x85 and 0xa0, which are Unicode space
162      characters, are recognized by isspace() and therefore were getting set in      characters, are recognized by isspace() and therefore were getting set in
163      these tables, and indeed these tables seem to approximate to ISO 8859. This      these tables, and indeed these tables seem to approximate to ISO 8859. This
164      caused a problem in UTF-8 mode when pcre_study() was used to create a list      caused a problem in UTF-8 mode when pcre_study() was used to create a list
165      of bytes that can start a match. For \s, it was including 0x85 and 0xa0,      of bytes that can start a match. For \s, it was including 0x85 and 0xa0,
166      which of course cannot start UTF-8 characters. I have changed the code so      which of course cannot start UTF-8 characters. I have changed the code so
167      that only real ASCII characters (less than 128) and the correct starting      that only real ASCII characters (less than 128) and the correct starting
168      bytes for UTF-8 encodings are set for characters greater than 127 when in      bytes for UTF-8 encodings are set for characters greater than 127 when in
169      UTF-8 mode. (When PCRE_UCP is set - see 9 above - the code is different      UTF-8 mode. (When PCRE_UCP is set - see 9 above - the code is different
170      altogether.)      altogether.)
171    
172  20. Added the /T option to pcretest so as to be able to run tests with non-  20. Added the /T option to pcretest so as to be able to run tests with non-
173      standard character tables, thus making it possible to include the tests      standard character tables, thus making it possible to include the tests
174      used for 19 above in the standard set of tests.      used for 19 above in the standard set of tests.
175    
176  21. A pattern such as (?&t)(?#()(?(DEFINE)(?<t>a)) which has a forward  21. A pattern such as (?&t)(?#()(?(DEFINE)(?<t>a)) which has a forward
177      reference to a subpattern the other side of a comment that contains an      reference to a subpattern the other side of a comment that contains an
178      opening parenthesis caused either an internal compiling error, or a      opening parenthesis caused either an internal compiling error, or a
179      reference to the wrong subpattern.      reference to the wrong subpattern.
180    
181    

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