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revision 7 by nigel, Sat Feb 24 21:38:09 2007 UTC revision 27 by nigel, Sat Feb 24 21:38:49 2007 UTC
# Line 2  ChangeLog for PCRE Line 2  ChangeLog for PCRE
2  ------------------  ------------------
3    
4    
5    Version 2.02 14-Jan-99
6    ----------------------
7    
8    1. Initialized the working variables associated with each extraction so that
9    their saving and restoring doesn't refer to uninitialized store.
10    
11    2. Put dummy code into study.c in order to trick the optimizer of the IBM C
12    compiler for OS/2 into generating correct code. Apparently IBM isn't going to
13    fix the problem.
14    
15    3. Pcretest: the timing code wasn't using LOOPREPEAT for timing execution
16    calls, and wasn't printing the correct value for compiling calls. Increased the
17    default value of LOOPREPEAT, and the number of significant figures in the
18    times.
19    
20    4. Changed "/bin/rm" in the Makefile to "-rm" so it works on Windows NT.
21    
22    5. Renamed "deftables" as "dftables" to get it down to 8 characters, to avoid
23    a building problem on Windows NT with a FAT file system.
24    
25    
26    Version 2.01 21-Oct-98
27    ----------------------
28    
29    1. Changed the API for pcre_compile() to allow for the provision of a pointer
30    to character tables built by pcre_maketables() in the current locale. If NULL
31    is passed, the default tables are used.
32    
33    
34    Version 2.00 24-Sep-98
35    ----------------------
36    
37    1. Since the (>?) facility is in Perl 5.005, don't require PCRE_EXTRA to enable
38    it any more.
39    
40    2. Allow quantification of (?>) groups, and make it work correctly.
41    
42    3. The first character computation wasn't working for (?>) groups.
43    
44    4. Correct the implementation of \Z (it is permitted to match on the \n at the
45    end of the subject) and add 5.005's \z, which really does match only at the
46    very end of the subject.
47    
48    5. Remove the \X "cut" facility; Perl doesn't have it, and (?> is neater.
49    
50    6. Remove the ability to specify CASELESS, MULTILINE, DOTALL, and
51    DOLLAR_END_ONLY at runtime, to make it possible to implement the Perl 5.005
52    localized options. All options to pcre_study() were also removed.
53    
54    7. Add other new features from 5.005:
55    
56       $(?<=           positive lookbehind
57       $(?<!           negative lookbehind
58       (?imsx-imsx)    added the unsetting capability
59                       such a setting is global if at outer level; local otherwise
60       (?imsx-imsx:)   non-capturing groups with option setting
61       (?(cond)re|re)  conditional pattern matching
62    
63       A backreference to itself in a repeated group matches the previous
64       captured string.
65    
66    8. General tidying up of studying (both automatic and via "study")
67    consequential on the addition of new assertions.
68    
69    9. As in 5.005, unlimited repeated groups that could match an empty substring
70    are no longer faulted at compile time. Instead, the loop is forcibly broken at
71    runtime if any iteration does actually match an empty substring.
72    
73    10. Include the RunTest script in the distribution.
74    
75    11. Added tests from the Perl 5.005_02 distribution. This showed up a few
76    discrepancies, some of which were old and were also with respect to 5.004. They
77    have now been fixed.
78    
79    
80    Version 1.09 28-Apr-98
81    ----------------------
82    
83    1. A negated single character class followed by a quantifier with a minimum
84    value of one (e.g.  [^x]{1,6}  ) was not compiled correctly. This could lead to
85    program crashes, or just wrong answers. This did not apply to negated classes
86    containing more than one character, or to minima other than one.
87    
88    
89    Version 1.08 27-Mar-98
90    ----------------------
91    
92    1. Add PCRE_UNGREEDY to invert the greediness of quantifiers.
93    
94    2. Add (?U) and (?X) to set PCRE_UNGREEDY and PCRE_EXTRA respectively. The
95    latter must appear before anything that relies on it in the pattern.
96    
97    
98    Version 1.07 16-Feb-98
99    ----------------------
100    
101    1. A pattern such as /((a)*)*/ was not being diagnosed as in error (unlimited
102    repeat of a potentially empty string).
103    
104    
105    Version 1.06 23-Jan-98
106    ----------------------
107    
108    1. Added Markus Oberhumer's little patches for C++.
109    
110    2. Literal strings longer than 255 characters were broken.
111    
112    
113    Version 1.05 23-Dec-97
114    ----------------------
115    
116    1. Negated character classes containing more than one character were failing if
117    PCRE_CASELESS was set at run time.
118    
119    
120    Version 1.04 19-Dec-97
121    ----------------------
122    
123    1. Corrected the man page, where some "const" qualifiers had been omitted.
124    
125    2. Made debugging output print "{0,xxx}" instead of just "{,xxx}" to agree with
126    input syntax.
127    
128    3. Fixed memory leak which occurred when a regex with back references was
129    matched with an offsets vector that wasn't big enough. The temporary memory
130    that is used in this case wasn't being freed if the match failed.
131    
132    4. Tidied pcretest to ensure it frees memory that it gets.
133    
134    5. Temporary memory was being obtained in the case where the passed offsets
135    vector was exactly big enough.
136    
137    6. Corrected definition of offsetof() from change 5 below.
138    
139    7. I had screwed up change 6 below and broken the rules for the use of
140    setjmp(). Now fixed.
141    
142    
143    Version 1.03 18-Dec-97
144    ----------------------
145    
146    1. A erroneous regex with a missing opening parenthesis was correctly
147    diagnosed, but PCRE attempted to access brastack[-1], which could cause crashes
148    on some systems.
149    
150    2. Replaced offsetof(real_pcre, code) by offsetof(real_pcre, code[0]) because
151    it was reported that one broken compiler failed on the former because "code" is
152    also an independent variable.
153    
154    3. The erroneous regex a[]b caused an array overrun reference.
155    
156    4. A regex ending with a one-character negative class (e.g. /[^k]$/) did not
157    fail on data ending with that character. (It was going on too far, and checking
158    the next character, typically a binary zero.) This was specific to the
159    optimized code for single-character negative classes.
160    
161    5. Added a contributed patch from the TIN world which does the following:
162    
163      + Add an undef for memmove, in case the the system defines a macro for it.
164    
165      + Add a definition of offsetof(), in case there isn't one. (I don't know
166        the reason behind this - offsetof() is part of the ANSI standard - but
167        it does no harm).
168    
169      + Reduce the ifdef's in pcre.c using macro DPRINTF, thereby eliminating
170        most of the places where whitespace preceded '#'. I have given up and
171        allowed the remaining 2 cases to be at the margin.
172    
173      + Rename some variables in pcre to eliminate shadowing. This seems very
174        pedantic, but does no harm, of course.
175    
176    6. Moved the call to setjmp() into its own function, to get rid of warnings
177    from gcc -Wall, and avoided calling it at all unless PCRE_EXTRA is used.
178    
179    7. Constructs such as \d{8,} were compiling into the equivalent of
180    \d{8}\d{0,65527} instead of \d{8}\d* which didn't make much difference to the
181    outcome, but in this particular case used more store than had been allocated,
182    which caused the bug to be discovered because it threw up an internal error.
183    
184    8. The debugging code in both pcre and pcretest for outputting the compiled
185    form of a regex was going wrong in the case of back references followed by
186    curly-bracketed repeats.
187    
188    
189  Version 1.02 12-Dec-97  Version 1.02 12-Dec-97
190  ----------------------  ----------------------
191    

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