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1 nigel 3 ChangeLog for PCRE
2     ------------------
3    
4 nigel 5
5 nigel 27 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 nigel 25 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 nigel 23 Version 2.00 24-Sep-98
35 nigel 21 ----------------------
36    
37 nigel 23 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 nigel 21 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 nigel 19 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 nigel 17 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 nigel 15 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 nigel 13 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 nigel 11 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 nigel 9 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 nigel 11 \d{8}\d{0,65527} instead of \d{8}\d* which didn't make much difference to the
181 nigel 9 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 nigel 7 Version 1.02 12-Dec-97
190     ----------------------
191    
192     1. Typos in pcre.3 and comments in the source fixed.
193    
194     2. Applied a contributed patch to get rid of places where it used to remove
195     'const' from variables, and fixed some signed/unsigned and uninitialized
196     variable warnings.
197    
198     3. Added the "runtest" target to Makefile.
199    
200     4. Set default compiler flag to -O2 rather than just -O.
201    
202    
203 nigel 5 Version 1.01 19-Nov-97
204     ----------------------
205    
206     1. PCRE was failing to diagnose unlimited repeat of empty string for patterns
207     like /([ab]*)*/, that is, for classes with more than one character in them.
208    
209     2. Likewise, it wasn't diagnosing patterns with "once-only" subpatterns, such
210     as /((?>a*))*/ (a PCRE_EXTRA facility).
211    
212    
213     Version 1.00 18-Nov-97
214     ----------------------
215    
216     1. Added compile-time macros to support systems such as SunOS4 which don't have
217     memmove() or strerror() but have other things that can be used instead.
218    
219     2. Arranged that "make clean" removes the executables.
220    
221    
222 nigel 3 Version 0.99 27-Oct-97
223     ----------------------
224    
225     1. Fixed bug in code for optimizing classes with only one character. It was
226     initializing a 32-byte map regardless, which could cause it to run off the end
227     of the memory it had got.
228    
229     2. Added, conditional on PCRE_EXTRA, the proposed (?>REGEX) construction.
230    
231    
232     Version 0.98 22-Oct-97
233     ----------------------
234    
235     1. Fixed bug in code for handling temporary memory usage when there are more
236     back references than supplied space in the ovector. This could cause segfaults.
237    
238    
239     Version 0.97 21-Oct-97
240     ----------------------
241    
242     1. Added the \X "cut" facility, conditional on PCRE_EXTRA.
243    
244     2. Optimized negated single characters not to use a bit map.
245    
246     3. Brought error texts together as macro definitions; clarified some of them;
247     fixed one that was wrong - it said "range out of order" when it meant "invalid
248     escape sequence".
249    
250     4. Changed some char * arguments to const char *.
251    
252     5. Added PCRE_NOTBOL and PCRE_NOTEOL (from POSIX).
253    
254     6. Added the POSIX-style API wrapper in pcreposix.a and testing facilities in
255     pcretest.
256    
257    
258     Version 0.96 16-Oct-97
259     ----------------------
260    
261     1. Added a simple "pgrep" utility to the distribution.
262    
263     2. Fixed an incompatibility with Perl: "{" is now treated as a normal character
264     unless it appears in one of the precise forms "{ddd}", "{ddd,}", or "{ddd,ddd}"
265     where "ddd" means "one or more decimal digits".
266    
267     3. Fixed serious bug. If a pattern had a back reference, but the call to
268     pcre_exec() didn't supply a large enough ovector to record the related
269     identifying subpattern, the match always failed. PCRE now remembers the number
270     of the largest back reference, and gets some temporary memory in which to save
271     the offsets during matching if necessary, in order to ensure that
272     backreferences always work.
273    
274     4. Increased the compatibility with Perl in a number of ways:
275    
276     (a) . no longer matches \n by default; an option PCRE_DOTALL is provided
277     to request this handling. The option can be set at compile or exec time.
278    
279     (b) $ matches before a terminating newline by default; an option
280     PCRE_DOLLAR_ENDONLY is provided to override this (but not in multiline
281     mode). The option can be set at compile or exec time.
282    
283     (c) The handling of \ followed by a digit other than 0 is now supposed to be
284     the same as Perl's. If the decimal number it represents is less than 10
285     or there aren't that many previous left capturing parentheses, an octal
286     escape is read. Inside a character class, it's always an octal escape,
287     even if it is a single digit.
288    
289     (d) An escaped but undefined alphabetic character is taken as a literal,
290     unless PCRE_EXTRA is set. Currently this just reserves the remaining
291     escapes.
292    
293     (e) {0} is now permitted. (The previous item is removed from the compiled
294     pattern).
295    
296     5. Changed all the names of code files so that the basic parts are no longer
297     than 10 characters, and abolished the teeny "globals.c" file.
298    
299     6. Changed the handling of character classes; they are now done with a 32-byte
300     bit map always.
301    
302     7. Added the -d and /D options to pcretest to make it possible to look at the
303     internals of compilation without having to recompile pcre.
304    
305    
306     Version 0.95 23-Sep-97
307     ----------------------
308    
309     1. Fixed bug in pre-pass concerning escaped "normal" characters such as \x5c or
310     \x20 at the start of a run of normal characters. These were being treated as
311     real characters, instead of the source characters being re-checked.
312    
313    
314     Version 0.94 18-Sep-97
315     ----------------------
316    
317     1. The functions are now thread-safe, with the caveat that the global variables
318     containing pointers to malloc() and free() or alternative functions are the
319     same for all threads.
320    
321     2. Get pcre_study() to generate a bitmap of initial characters for non-
322     anchored patterns when this is possible, and use it if passed to pcre_exec().
323    
324    
325     Version 0.93 15-Sep-97
326     ----------------------
327    
328     1. /(b)|(:+)/ was computing an incorrect first character.
329    
330     2. Add pcre_study() to the API and the passing of pcre_extra to pcre_exec(),
331     but not actually doing anything yet.
332    
333     3. Treat "-" characters in classes that cannot be part of ranges as literals,
334     as Perl does (e.g. [-az] or [az-]).
335    
336     4. Set the anchored flag if a branch starts with .* or .*? because that tests
337     all possible positions.
338    
339     5. Split up into different modules to avoid including unneeded functions in a
340     compiled binary. However, compile and exec are still in one module. The "study"
341     function is split off.
342    
343     6. The character tables are now in a separate module whose source is generated
344     by an auxiliary program - but can then be edited by hand if required. There are
345     now no calls to isalnum(), isspace(), isdigit(), isxdigit(), tolower() or
346     toupper() in the code.
347    
348     7. Turn the malloc/free funtions variables into pcre_malloc and pcre_free and
349     make them global. Abolish the function for setting them, as the caller can now
350     set them directly.
351    
352    
353     Version 0.92 11-Sep-97
354     ----------------------
355    
356     1. A repeat with a fixed maximum and a minimum of 1 for an ordinary character
357     (e.g. /a{1,3}/) was broken (I mis-optimized it).
358    
359     2. Caseless matching was not working in character classes if the characters in
360     the pattern were in upper case.
361    
362     3. Make ranges like [W-c] work in the same way as Perl for caseless matching.
363    
364     4. Make PCRE_ANCHORED public and accept as a compile option.
365    
366     5. Add an options word to pcre_exec() and accept PCRE_ANCHORED and
367     PCRE_CASELESS at run time. Add escapes \A and \I to pcretest to cause it to
368     pass them.
369    
370     6. Give an error if bad option bits passed at compile or run time.
371    
372     7. Add PCRE_MULTILINE at compile and exec time, and (?m) as well. Add \M to
373     pcretest to cause it to pass that flag.
374    
375     8. Add pcre_info(), to get the number of identifying subpatterns, the stored
376     options, and the first character, if set.
377    
378     9. Recognize C+ or C{n,m} where n >= 1 as providing a fixed starting character.
379    
380    
381     Version 0.91 10-Sep-97
382     ----------------------
383    
384     1. PCRE was failing to diagnose unlimited repeats of subpatterns that could
385     match the empty string as in /(a*)*/. It was looping and ultimately crashing.
386    
387     2. PCRE was looping on encountering an indefinitely repeated back reference to
388     a subpattern that had matched an empty string, e.g. /(a|)\1*/. It now does what
389     Perl does - treats the match as successful.
390    
391     ****

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