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1 nigel 3 ChangeLog for PCRE
2     ------------------
3    
4 nigel 5
5 nigel 25 Version 2.01 21-Oct-98
6     ----------------------
7    
8     1. Changed the API for pcre_compile() to allow for the provision of a pointer
9     to character tables built by pcre_maketables() in the current locale. If NULL
10     is passed, the default tables are used.
11    
12    
13 nigel 23 Version 2.00 24-Sep-98
14 nigel 21 ----------------------
15    
16 nigel 23 1. Since the (>?) facility is in Perl 5.005, don't require PCRE_EXTRA to enable
17     it any more.
18    
19     2. Allow quantification of (?>) groups, and make it work correctly.
20    
21     3. The first character computation wasn't working for (?>) groups.
22    
23     4. Correct the implementation of \Z (it is permitted to match on the \n at the
24     end of the subject) and add 5.005's \z, which really does match only at the
25     very end of the subject.
26    
27     5. Remove the \X "cut" facility; Perl doesn't have it, and (?> is neater.
28    
29     6. Remove the ability to specify CASELESS, MULTILINE, DOTALL, and
30     DOLLAR_END_ONLY at runtime, to make it possible to implement the Perl 5.005
31     localized options. All options to pcre_study() were also removed.
32    
33     7. Add other new features from 5.005:
34    
35     $(?<= positive lookbehind
36     $(?<! negative lookbehind
37     (?imsx-imsx) added the unsetting capability
38     such a setting is global if at outer level; local otherwise
39     (?imsx-imsx:) non-capturing groups with option setting
40     (?(cond)re|re) conditional pattern matching
41    
42     A backreference to itself in a repeated group matches the previous
43     captured string.
44    
45     8. General tidying up of studying (both automatic and via "study")
46     consequential on the addition of new assertions.
47    
48     9. As in 5.005, unlimited repeated groups that could match an empty substring
49     are no longer faulted at compile time. Instead, the loop is forcibly broken at
50     runtime if any iteration does actually match an empty substring.
51    
52     10. Include the RunTest script in the distribution.
53    
54     11. Added tests from the Perl 5.005_02 distribution. This showed up a few
55     discrepancies, some of which were old and were also with respect to 5.004. They
56     have now been fixed.
57    
58    
59     Version 1.09 28-Apr-98
60     ----------------------
61    
62 nigel 21 1. A negated single character class followed by a quantifier with a minimum
63     value of one (e.g. [^x]{1,6} ) was not compiled correctly. This could lead to
64     program crashes, or just wrong answers. This did not apply to negated classes
65     containing more than one character, or to minima other than one.
66    
67    
68 nigel 19 Version 1.08 27-Mar-98
69     ----------------------
70    
71     1. Add PCRE_UNGREEDY to invert the greediness of quantifiers.
72    
73     2. Add (?U) and (?X) to set PCRE_UNGREEDY and PCRE_EXTRA respectively. The
74     latter must appear before anything that relies on it in the pattern.
75    
76    
77 nigel 17 Version 1.07 16-Feb-98
78     ----------------------
79    
80     1. A pattern such as /((a)*)*/ was not being diagnosed as in error (unlimited
81     repeat of a potentially empty string).
82    
83    
84 nigel 15 Version 1.06 23-Jan-98
85     ----------------------
86    
87     1. Added Markus Oberhumer's little patches for C++.
88    
89     2. Literal strings longer than 255 characters were broken.
90    
91    
92 nigel 13 Version 1.05 23-Dec-97
93     ----------------------
94    
95     1. Negated character classes containing more than one character were failing if
96     PCRE_CASELESS was set at run time.
97    
98    
99 nigel 11 Version 1.04 19-Dec-97
100     ----------------------
101    
102     1. Corrected the man page, where some "const" qualifiers had been omitted.
103    
104     2. Made debugging output print "{0,xxx}" instead of just "{,xxx}" to agree with
105     input syntax.
106    
107     3. Fixed memory leak which occurred when a regex with back references was
108     matched with an offsets vector that wasn't big enough. The temporary memory
109     that is used in this case wasn't being freed if the match failed.
110    
111     4. Tidied pcretest to ensure it frees memory that it gets.
112    
113     5. Temporary memory was being obtained in the case where the passed offsets
114     vector was exactly big enough.
115    
116     6. Corrected definition of offsetof() from change 5 below.
117    
118     7. I had screwed up change 6 below and broken the rules for the use of
119     setjmp(). Now fixed.
120    
121    
122 nigel 9 Version 1.03 18-Dec-97
123     ----------------------
124    
125     1. A erroneous regex with a missing opening parenthesis was correctly
126     diagnosed, but PCRE attempted to access brastack[-1], which could cause crashes
127     on some systems.
128    
129     2. Replaced offsetof(real_pcre, code) by offsetof(real_pcre, code[0]) because
130     it was reported that one broken compiler failed on the former because "code" is
131     also an independent variable.
132    
133     3. The erroneous regex a[]b caused an array overrun reference.
134    
135     4. A regex ending with a one-character negative class (e.g. /[^k]$/) did not
136     fail on data ending with that character. (It was going on too far, and checking
137     the next character, typically a binary zero.) This was specific to the
138     optimized code for single-character negative classes.
139    
140     5. Added a contributed patch from the TIN world which does the following:
141    
142     + Add an undef for memmove, in case the the system defines a macro for it.
143    
144     + Add a definition of offsetof(), in case there isn't one. (I don't know
145     the reason behind this - offsetof() is part of the ANSI standard - but
146     it does no harm).
147    
148     + Reduce the ifdef's in pcre.c using macro DPRINTF, thereby eliminating
149     most of the places where whitespace preceded '#'. I have given up and
150     allowed the remaining 2 cases to be at the margin.
151    
152     + Rename some variables in pcre to eliminate shadowing. This seems very
153     pedantic, but does no harm, of course.
154    
155     6. Moved the call to setjmp() into its own function, to get rid of warnings
156     from gcc -Wall, and avoided calling it at all unless PCRE_EXTRA is used.
157    
158     7. Constructs such as \d{8,} were compiling into the equivalent of
159 nigel 11 \d{8}\d{0,65527} instead of \d{8}\d* which didn't make much difference to the
160 nigel 9 outcome, but in this particular case used more store than had been allocated,
161     which caused the bug to be discovered because it threw up an internal error.
162    
163     8. The debugging code in both pcre and pcretest for outputting the compiled
164     form of a regex was going wrong in the case of back references followed by
165     curly-bracketed repeats.
166    
167    
168 nigel 7 Version 1.02 12-Dec-97
169     ----------------------
170    
171     1. Typos in pcre.3 and comments in the source fixed.
172    
173     2. Applied a contributed patch to get rid of places where it used to remove
174     'const' from variables, and fixed some signed/unsigned and uninitialized
175     variable warnings.
176    
177     3. Added the "runtest" target to Makefile.
178    
179     4. Set default compiler flag to -O2 rather than just -O.
180    
181    
182 nigel 5 Version 1.01 19-Nov-97
183     ----------------------
184    
185     1. PCRE was failing to diagnose unlimited repeat of empty string for patterns
186     like /([ab]*)*/, that is, for classes with more than one character in them.
187    
188     2. Likewise, it wasn't diagnosing patterns with "once-only" subpatterns, such
189     as /((?>a*))*/ (a PCRE_EXTRA facility).
190    
191    
192     Version 1.00 18-Nov-97
193     ----------------------
194    
195     1. Added compile-time macros to support systems such as SunOS4 which don't have
196     memmove() or strerror() but have other things that can be used instead.
197    
198     2. Arranged that "make clean" removes the executables.
199    
200    
201 nigel 3 Version 0.99 27-Oct-97
202     ----------------------
203    
204     1. Fixed bug in code for optimizing classes with only one character. It was
205     initializing a 32-byte map regardless, which could cause it to run off the end
206     of the memory it had got.
207    
208     2. Added, conditional on PCRE_EXTRA, the proposed (?>REGEX) construction.
209    
210    
211     Version 0.98 22-Oct-97
212     ----------------------
213    
214     1. Fixed bug in code for handling temporary memory usage when there are more
215     back references than supplied space in the ovector. This could cause segfaults.
216    
217    
218     Version 0.97 21-Oct-97
219     ----------------------
220    
221     1. Added the \X "cut" facility, conditional on PCRE_EXTRA.
222    
223     2. Optimized negated single characters not to use a bit map.
224    
225     3. Brought error texts together as macro definitions; clarified some of them;
226     fixed one that was wrong - it said "range out of order" when it meant "invalid
227     escape sequence".
228    
229     4. Changed some char * arguments to const char *.
230    
231     5. Added PCRE_NOTBOL and PCRE_NOTEOL (from POSIX).
232    
233     6. Added the POSIX-style API wrapper in pcreposix.a and testing facilities in
234     pcretest.
235    
236    
237     Version 0.96 16-Oct-97
238     ----------------------
239    
240     1. Added a simple "pgrep" utility to the distribution.
241    
242     2. Fixed an incompatibility with Perl: "{" is now treated as a normal character
243     unless it appears in one of the precise forms "{ddd}", "{ddd,}", or "{ddd,ddd}"
244     where "ddd" means "one or more decimal digits".
245    
246     3. Fixed serious bug. If a pattern had a back reference, but the call to
247     pcre_exec() didn't supply a large enough ovector to record the related
248     identifying subpattern, the match always failed. PCRE now remembers the number
249     of the largest back reference, and gets some temporary memory in which to save
250     the offsets during matching if necessary, in order to ensure that
251     backreferences always work.
252    
253     4. Increased the compatibility with Perl in a number of ways:
254    
255     (a) . no longer matches \n by default; an option PCRE_DOTALL is provided
256     to request this handling. The option can be set at compile or exec time.
257    
258     (b) $ matches before a terminating newline by default; an option
259     PCRE_DOLLAR_ENDONLY is provided to override this (but not in multiline
260     mode). The option can be set at compile or exec time.
261    
262     (c) The handling of \ followed by a digit other than 0 is now supposed to be
263     the same as Perl's. If the decimal number it represents is less than 10
264     or there aren't that many previous left capturing parentheses, an octal
265     escape is read. Inside a character class, it's always an octal escape,
266     even if it is a single digit.
267    
268     (d) An escaped but undefined alphabetic character is taken as a literal,
269     unless PCRE_EXTRA is set. Currently this just reserves the remaining
270     escapes.
271    
272     (e) {0} is now permitted. (The previous item is removed from the compiled
273     pattern).
274    
275     5. Changed all the names of code files so that the basic parts are no longer
276     than 10 characters, and abolished the teeny "globals.c" file.
277    
278     6. Changed the handling of character classes; they are now done with a 32-byte
279     bit map always.
280    
281     7. Added the -d and /D options to pcretest to make it possible to look at the
282     internals of compilation without having to recompile pcre.
283    
284    
285     Version 0.95 23-Sep-97
286     ----------------------
287    
288     1. Fixed bug in pre-pass concerning escaped "normal" characters such as \x5c or
289     \x20 at the start of a run of normal characters. These were being treated as
290     real characters, instead of the source characters being re-checked.
291    
292    
293     Version 0.94 18-Sep-97
294     ----------------------
295    
296     1. The functions are now thread-safe, with the caveat that the global variables
297     containing pointers to malloc() and free() or alternative functions are the
298     same for all threads.
299    
300     2. Get pcre_study() to generate a bitmap of initial characters for non-
301     anchored patterns when this is possible, and use it if passed to pcre_exec().
302    
303    
304     Version 0.93 15-Sep-97
305     ----------------------
306    
307     1. /(b)|(:+)/ was computing an incorrect first character.
308    
309     2. Add pcre_study() to the API and the passing of pcre_extra to pcre_exec(),
310     but not actually doing anything yet.
311    
312     3. Treat "-" characters in classes that cannot be part of ranges as literals,
313     as Perl does (e.g. [-az] or [az-]).
314    
315     4. Set the anchored flag if a branch starts with .* or .*? because that tests
316     all possible positions.
317    
318     5. Split up into different modules to avoid including unneeded functions in a
319     compiled binary. However, compile and exec are still in one module. The "study"
320     function is split off.
321    
322     6. The character tables are now in a separate module whose source is generated
323     by an auxiliary program - but can then be edited by hand if required. There are
324     now no calls to isalnum(), isspace(), isdigit(), isxdigit(), tolower() or
325     toupper() in the code.
326    
327     7. Turn the malloc/free funtions variables into pcre_malloc and pcre_free and
328     make them global. Abolish the function for setting them, as the caller can now
329     set them directly.
330    
331    
332     Version 0.92 11-Sep-97
333     ----------------------
334    
335     1. A repeat with a fixed maximum and a minimum of 1 for an ordinary character
336     (e.g. /a{1,3}/) was broken (I mis-optimized it).
337    
338     2. Caseless matching was not working in character classes if the characters in
339     the pattern were in upper case.
340    
341     3. Make ranges like [W-c] work in the same way as Perl for caseless matching.
342    
343     4. Make PCRE_ANCHORED public and accept as a compile option.
344    
345     5. Add an options word to pcre_exec() and accept PCRE_ANCHORED and
346     PCRE_CASELESS at run time. Add escapes \A and \I to pcretest to cause it to
347     pass them.
348    
349     6. Give an error if bad option bits passed at compile or run time.
350    
351     7. Add PCRE_MULTILINE at compile and exec time, and (?m) as well. Add \M to
352     pcretest to cause it to pass that flag.
353    
354     8. Add pcre_info(), to get the number of identifying subpatterns, the stored
355     options, and the first character, if set.
356    
357     9. Recognize C+ or C{n,m} where n >= 1 as providing a fixed starting character.
358    
359    
360     Version 0.91 10-Sep-97
361     ----------------------
362    
363     1. PCRE was failing to diagnose unlimited repeats of subpatterns that could
364     match the empty string as in /(a*)*/. It was looping and ultimately crashing.
365    
366     2. PCRE was looping on encountering an indefinitely repeated back reference to
367     a subpattern that had matched an empty string, e.g. /(a|)\1*/. It now does what
368     Perl does - treats the match as successful.
369    
370     ****

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