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revision 3 by nigel, Sat Feb 24 21:38:01 2007 UTC revision 29 by nigel, Sat Feb 24 21:38:53 2007 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4    
5    Version 2.03 02-Feb-99
6    ----------------------
7    
8    1. Fixed typo and small mistake in man page.
9    
10    2. Added 4th condition (GPL supersedes) and created separate LICENCE file.
11    
12    3. Updated pcretest so that patterns such as /abc\/def/ work like they do in
13    Perl, that is the internal \ allows the delimiter to be included in the
14    pattern. Locked out the use of \ as a delimiter. If \ immediately follows
15    the final delimiter, add \ to the end of the pattern (to test the error).
16    
17    4. Added the convenience functions for extracting substrings after a successful
18    match. Updated pcretest to make it able to test these functions.
19    
20    
21    Version 2.02 14-Jan-99
22    ----------------------
23    
24    1. Initialized the working variables associated with each extraction so that
25    their saving and restoring doesn't refer to uninitialized store.
26    
27    2. Put dummy code into study.c in order to trick the optimizer of the IBM C
28    compiler for OS/2 into generating correct code. Apparently IBM isn't going to
29    fix the problem.
30    
31    3. Pcretest: the timing code wasn't using LOOPREPEAT for timing execution
32    calls, and wasn't printing the correct value for compiling calls. Increased the
33    default value of LOOPREPEAT, and the number of significant figures in the
34    times.
35    
36    4. Changed "/bin/rm" in the Makefile to "-rm" so it works on Windows NT.
37    
38    5. Renamed "deftables" as "dftables" to get it down to 8 characters, to avoid
39    a building problem on Windows NT with a FAT file system.
40    
41    
42    Version 2.01 21-Oct-98
43    ----------------------
44    
45    1. Changed the API for pcre_compile() to allow for the provision of a pointer
46    to character tables built by pcre_maketables() in the current locale. If NULL
47    is passed, the default tables are used.
48    
49    
50    Version 2.00 24-Sep-98
51    ----------------------
52    
53    1. Since the (>?) facility is in Perl 5.005, don't require PCRE_EXTRA to enable
54    it any more.
55    
56    2. Allow quantification of (?>) groups, and make it work correctly.
57    
58    3. The first character computation wasn't working for (?>) groups.
59    
60    4. Correct the implementation of \Z (it is permitted to match on the \n at the
61    end of the subject) and add 5.005's \z, which really does match only at the
62    very end of the subject.
63    
64    5. Remove the \X "cut" facility; Perl doesn't have it, and (?> is neater.
65    
66    6. Remove the ability to specify CASELESS, MULTILINE, DOTALL, and
67    DOLLAR_END_ONLY at runtime, to make it possible to implement the Perl 5.005
68    localized options. All options to pcre_study() were also removed.
69    
70    7. Add other new features from 5.005:
71    
72       $(?<=           positive lookbehind
73       $(?<!           negative lookbehind
74       (?imsx-imsx)    added the unsetting capability
75                       such a setting is global if at outer level; local otherwise
76       (?imsx-imsx:)   non-capturing groups with option setting
77       (?(cond)re|re)  conditional pattern matching
78    
79       A backreference to itself in a repeated group matches the previous
80       captured string.
81    
82    8. General tidying up of studying (both automatic and via "study")
83    consequential on the addition of new assertions.
84    
85    9. As in 5.005, unlimited repeated groups that could match an empty substring
86    are no longer faulted at compile time. Instead, the loop is forcibly broken at
87    runtime if any iteration does actually match an empty substring.
88    
89    10. Include the RunTest script in the distribution.
90    
91    11. Added tests from the Perl 5.005_02 distribution. This showed up a few
92    discrepancies, some of which were old and were also with respect to 5.004. They
93    have now been fixed.
94    
95    
96    Version 1.09 28-Apr-98
97    ----------------------
98    
99    1. A negated single character class followed by a quantifier with a minimum
100    value of one (e.g.  [^x]{1,6}  ) was not compiled correctly. This could lead to
101    program crashes, or just wrong answers. This did not apply to negated classes
102    containing more than one character, or to minima other than one.
103    
104    
105    Version 1.08 27-Mar-98
106    ----------------------
107    
108    1. Add PCRE_UNGREEDY to invert the greediness of quantifiers.
109    
110    2. Add (?U) and (?X) to set PCRE_UNGREEDY and PCRE_EXTRA respectively. The
111    latter must appear before anything that relies on it in the pattern.
112    
113    
114    Version 1.07 16-Feb-98
115    ----------------------
116    
117    1. A pattern such as /((a)*)*/ was not being diagnosed as in error (unlimited
118    repeat of a potentially empty string).
119    
120    
121    Version 1.06 23-Jan-98
122    ----------------------
123    
124    1. Added Markus Oberhumer's little patches for C++.
125    
126    2. Literal strings longer than 255 characters were broken.
127    
128    
129    Version 1.05 23-Dec-97
130    ----------------------
131    
132    1. Negated character classes containing more than one character were failing if
133    PCRE_CASELESS was set at run time.
134    
135    
136    Version 1.04 19-Dec-97
137    ----------------------
138    
139    1. Corrected the man page, where some "const" qualifiers had been omitted.
140    
141    2. Made debugging output print "{0,xxx}" instead of just "{,xxx}" to agree with
142    input syntax.
143    
144    3. Fixed memory leak which occurred when a regex with back references was
145    matched with an offsets vector that wasn't big enough. The temporary memory
146    that is used in this case wasn't being freed if the match failed.
147    
148    4. Tidied pcretest to ensure it frees memory that it gets.
149    
150    5. Temporary memory was being obtained in the case where the passed offsets
151    vector was exactly big enough.
152    
153    6. Corrected definition of offsetof() from change 5 below.
154    
155    7. I had screwed up change 6 below and broken the rules for the use of
156    setjmp(). Now fixed.
157    
158    
159    Version 1.03 18-Dec-97
160    ----------------------
161    
162    1. A erroneous regex with a missing opening parenthesis was correctly
163    diagnosed, but PCRE attempted to access brastack[-1], which could cause crashes
164    on some systems.
165    
166    2. Replaced offsetof(real_pcre, code) by offsetof(real_pcre, code[0]) because
167    it was reported that one broken compiler failed on the former because "code" is
168    also an independent variable.
169    
170    3. The erroneous regex a[]b caused an array overrun reference.
171    
172    4. A regex ending with a one-character negative class (e.g. /[^k]$/) did not
173    fail on data ending with that character. (It was going on too far, and checking
174    the next character, typically a binary zero.) This was specific to the
175    optimized code for single-character negative classes.
176    
177    5. Added a contributed patch from the TIN world which does the following:
178    
179      + Add an undef for memmove, in case the the system defines a macro for it.
180    
181      + Add a definition of offsetof(), in case there isn't one. (I don't know
182        the reason behind this - offsetof() is part of the ANSI standard - but
183        it does no harm).
184    
185      + Reduce the ifdef's in pcre.c using macro DPRINTF, thereby eliminating
186        most of the places where whitespace preceded '#'. I have given up and
187        allowed the remaining 2 cases to be at the margin.
188    
189      + Rename some variables in pcre to eliminate shadowing. This seems very
190        pedantic, but does no harm, of course.
191    
192    6. Moved the call to setjmp() into its own function, to get rid of warnings
193    from gcc -Wall, and avoided calling it at all unless PCRE_EXTRA is used.
194    
195    7. Constructs such as \d{8,} were compiling into the equivalent of
196    \d{8}\d{0,65527} instead of \d{8}\d* which didn't make much difference to the
197    outcome, but in this particular case used more store than had been allocated,
198    which caused the bug to be discovered because it threw up an internal error.
199    
200    8. The debugging code in both pcre and pcretest for outputting the compiled
201    form of a regex was going wrong in the case of back references followed by
202    curly-bracketed repeats.
203    
204    
205    Version 1.02 12-Dec-97
206    ----------------------
207    
208    1. Typos in pcre.3 and comments in the source fixed.
209    
210    2. Applied a contributed patch to get rid of places where it used to remove
211    'const' from variables, and fixed some signed/unsigned and uninitialized
212    variable warnings.
213    
214    3. Added the "runtest" target to Makefile.
215    
216    4. Set default compiler flag to -O2 rather than just -O.
217    
218    
219    Version 1.01 19-Nov-97
220    ----------------------
221    
222    1. PCRE was failing to diagnose unlimited repeat of empty string for patterns
223    like /([ab]*)*/, that is, for classes with more than one character in them.
224    
225    2. Likewise, it wasn't diagnosing patterns with "once-only" subpatterns, such
226    as /((?>a*))*/ (a PCRE_EXTRA facility).
227    
228    
229    Version 1.00 18-Nov-97
230    ----------------------
231    
232    1. Added compile-time macros to support systems such as SunOS4 which don't have
233    memmove() or strerror() but have other things that can be used instead.
234    
235    2. Arranged that "make clean" removes the executables.
236    
237    
238  Version 0.99 27-Oct-97  Version 0.99 27-Oct-97
239  ----------------------  ----------------------
240    

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