/[pcre]/code/tags/pcre-1.00/ChangeLog
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1 nigel 3 ChangeLog for PCRE
2     ------------------
3    
4     Version 0.99 27-Oct-97
5     ----------------------
6    
7     1. Fixed bug in code for optimizing classes with only one character. It was
8     initializing a 32-byte map regardless, which could cause it to run off the end
9     of the memory it had got.
10    
11     2. Added, conditional on PCRE_EXTRA, the proposed (?>REGEX) construction.
12    
13    
14     Version 0.98 22-Oct-97
15     ----------------------
16    
17     1. Fixed bug in code for handling temporary memory usage when there are more
18     back references than supplied space in the ovector. This could cause segfaults.
19    
20    
21     Version 0.97 21-Oct-97
22     ----------------------
23    
24     1. Added the \X "cut" facility, conditional on PCRE_EXTRA.
25    
26     2. Optimized negated single characters not to use a bit map.
27    
28     3. Brought error texts together as macro definitions; clarified some of them;
29     fixed one that was wrong - it said "range out of order" when it meant "invalid
30     escape sequence".
31    
32     4. Changed some char * arguments to const char *.
33    
34     5. Added PCRE_NOTBOL and PCRE_NOTEOL (from POSIX).
35    
36     6. Added the POSIX-style API wrapper in pcreposix.a and testing facilities in
37     pcretest.
38    
39    
40     Version 0.96 16-Oct-97
41     ----------------------
42    
43     1. Added a simple "pgrep" utility to the distribution.
44    
45     2. Fixed an incompatibility with Perl: "{" is now treated as a normal character
46     unless it appears in one of the precise forms "{ddd}", "{ddd,}", or "{ddd,ddd}"
47     where "ddd" means "one or more decimal digits".
48    
49     3. Fixed serious bug. If a pattern had a back reference, but the call to
50     pcre_exec() didn't supply a large enough ovector to record the related
51     identifying subpattern, the match always failed. PCRE now remembers the number
52     of the largest back reference, and gets some temporary memory in which to save
53     the offsets during matching if necessary, in order to ensure that
54     backreferences always work.
55    
56     4. Increased the compatibility with Perl in a number of ways:
57    
58     (a) . no longer matches \n by default; an option PCRE_DOTALL is provided
59     to request this handling. The option can be set at compile or exec time.
60    
61     (b) $ matches before a terminating newline by default; an option
62     PCRE_DOLLAR_ENDONLY is provided to override this (but not in multiline
63     mode). The option can be set at compile or exec time.
64    
65     (c) The handling of \ followed by a digit other than 0 is now supposed to be
66     the same as Perl's. If the decimal number it represents is less than 10
67     or there aren't that many previous left capturing parentheses, an octal
68     escape is read. Inside a character class, it's always an octal escape,
69     even if it is a single digit.
70    
71     (d) An escaped but undefined alphabetic character is taken as a literal,
72     unless PCRE_EXTRA is set. Currently this just reserves the remaining
73     escapes.
74    
75     (e) {0} is now permitted. (The previous item is removed from the compiled
76     pattern).
77    
78     5. Changed all the names of code files so that the basic parts are no longer
79     than 10 characters, and abolished the teeny "globals.c" file.
80    
81     6. Changed the handling of character classes; they are now done with a 32-byte
82     bit map always.
83    
84     7. Added the -d and /D options to pcretest to make it possible to look at the
85     internals of compilation without having to recompile pcre.
86    
87    
88     Version 0.95 23-Sep-97
89     ----------------------
90    
91     1. Fixed bug in pre-pass concerning escaped "normal" characters such as \x5c or
92     \x20 at the start of a run of normal characters. These were being treated as
93     real characters, instead of the source characters being re-checked.
94    
95    
96     Version 0.94 18-Sep-97
97     ----------------------
98    
99     1. The functions are now thread-safe, with the caveat that the global variables
100     containing pointers to malloc() and free() or alternative functions are the
101     same for all threads.
102    
103     2. Get pcre_study() to generate a bitmap of initial characters for non-
104     anchored patterns when this is possible, and use it if passed to pcre_exec().
105    
106    
107     Version 0.93 15-Sep-97
108     ----------------------
109    
110     1. /(b)|(:+)/ was computing an incorrect first character.
111    
112     2. Add pcre_study() to the API and the passing of pcre_extra to pcre_exec(),
113     but not actually doing anything yet.
114    
115     3. Treat "-" characters in classes that cannot be part of ranges as literals,
116     as Perl does (e.g. [-az] or [az-]).
117    
118     4. Set the anchored flag if a branch starts with .* or .*? because that tests
119     all possible positions.
120    
121     5. Split up into different modules to avoid including unneeded functions in a
122     compiled binary. However, compile and exec are still in one module. The "study"
123     function is split off.
124    
125     6. The character tables are now in a separate module whose source is generated
126     by an auxiliary program - but can then be edited by hand if required. There are
127     now no calls to isalnum(), isspace(), isdigit(), isxdigit(), tolower() or
128     toupper() in the code.
129    
130     7. Turn the malloc/free funtions variables into pcre_malloc and pcre_free and
131     make them global. Abolish the function for setting them, as the caller can now
132     set them directly.
133    
134    
135     Version 0.92 11-Sep-97
136     ----------------------
137    
138     1. A repeat with a fixed maximum and a minimum of 1 for an ordinary character
139     (e.g. /a{1,3}/) was broken (I mis-optimized it).
140    
141     2. Caseless matching was not working in character classes if the characters in
142     the pattern were in upper case.
143    
144     3. Make ranges like [W-c] work in the same way as Perl for caseless matching.
145    
146     4. Make PCRE_ANCHORED public and accept as a compile option.
147    
148     5. Add an options word to pcre_exec() and accept PCRE_ANCHORED and
149     PCRE_CASELESS at run time. Add escapes \A and \I to pcretest to cause it to
150     pass them.
151    
152     6. Give an error if bad option bits passed at compile or run time.
153    
154     7. Add PCRE_MULTILINE at compile and exec time, and (?m) as well. Add \M to
155     pcretest to cause it to pass that flag.
156    
157     8. Add pcre_info(), to get the number of identifying subpatterns, the stored
158     options, and the first character, if set.
159    
160     9. Recognize C+ or C{n,m} where n >= 1 as providing a fixed starting character.
161    
162    
163     Version 0.91 10-Sep-97
164     ----------------------
165    
166     1. PCRE was failing to diagnose unlimited repeats of subpatterns that could
167     match the empty string as in /(a*)*/. It was looping and ultimately crashing.
168    
169     2. PCRE was looping on encountering an indefinitely repeated back reference to
170     a subpattern that had matched an empty string, e.g. /(a|)\1*/. It now does what
171     Perl does - treats the match as successful.
172    
173     ****

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