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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 7.1 12-Mar-07  Version 8.0 02 Jul-08
5    ---------------------
6    
7    1.  Replaced UCP searching code with optimized version as implemented for Ad
8        Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
9        stage table and inline lookup instead of a function, giving speed ups of 2
10        to 5 times on some simple patterns that I tested. Permission was given to
11        distribute the MultiStage2.py script that generates the tables (it's not in
12        the tarball, but is in the Subversion repository).
13    
14    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
15        scripts.
16    
17    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
18        a group with a zero qualifier. The result of the study could be incorrect,
19        or the function might crash, depending on the pattern.
20    
21    
22    Version 7.7 07-May-08
23    ---------------------
24    
25    1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
26        a string to a long long, pretend we don't even have a long long." This is
27        done by checking for the strtoq, strtoll, and _strtoi64 functions.
28    
29    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
30        pre-7.6 versions, which defined a global no_arg variable instead of putting
31        it in the RE class. (See also #8 below.)
32    
33    3.  Remove a line of dead code, identified by coverity and reported by Nuno
34        Lopes.
35    
36    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
37    
38        (1) The include/exclude patterns were being applied to the whole pathnames
39            of files, instead of just to the final components.
40    
41        (2) If there was more than one level of directory, the subdirectories were
42            skipped unless they satisfied the include/exclude conditions. This is
43            inconsistent with GNU grep (and could even be seen as contrary to the
44            pcregrep specification - which I improved to make it absolutely clear).
45            The action now is always to scan all levels of directory, and just
46            apply the include/exclude patterns to regular files.
47    
48    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
49        --exclude_dir in the tests to avoid scanning .svn directories.
50    
51    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
52        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
53        doesn't support NULs in patterns.
54    
55    7.  Added some missing "const"s to declarations of static tables in
56        pcre_compile.c and pcre_dfa_exec.c.
57    
58    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
59        caused by fix #2  above. (Subsequently also a second patch to fix the
60        first patch. And a third patch - this was a messy problem.)
61    
62    9.  Applied Craig's patch to remove the use of push_back().
63    
64    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
65        matching function regexec().
66    
67    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
68        which, however, unlike Perl's \g{...}, are subroutine calls, not back
69        references. PCRE supports relative numbers with this syntax (I don't think
70        Oniguruma does).
71    
72    12. Previously, a group with a zero repeat such as (...){0} was completely
73        omitted from the compiled regex. However, this means that if the group
74        was called as a subroutine from elsewhere in the pattern, things went wrong
75        (an internal error was given). Such groups are now left in the compiled
76        pattern, with a new opcode that causes them to be skipped at execution
77        time.
78    
79    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
80        to the way PCRE behaves:
81    
82        (a) A lone ] character is dis-allowed (Perl treats it as data).
83    
84        (b) A back reference to an unmatched subpattern matches an empty string
85            (Perl fails the current match path).
86    
87        (c) A data ] in a character class must be notated as \] because if the
88            first data character in a class is ], it defines an empty class. (In
89            Perl it is not possible to have an empty class.) The empty class []
90            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
91            The negative empty class [^] matches any one character, independently
92            of the DOTALL setting.
93    
94    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
95        non-existent subpattern following a character class starting with ']' and
96        containing () gave an internal compiling error instead of "reference to
97        non-existent subpattern". Fortunately, when the pattern did exist, the
98        compiled code was correct. (When scanning forwards to check for the
99        existencd of the subpattern, it was treating the data ']' as terminating
100        the class, so got the count wrong. When actually compiling, the reference
101        was subsequently set up correctly.)
102    
103    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
104        it was being rejected as not supported by pcre_dfa_exec(), even though
105        other assertions are supported. I have made pcre_dfa_exec() support
106        (*FAIL).
107    
108    16. The implementation of 13c above involved the invention of a new opcode,
109        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
110        cannot be changed at match time, I realized I could make a small
111        improvement to matching performance by compiling OP_ALLANY instead of
112        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
113        on the OP_ANY path.
114    
115    17. Compiling pcretest on Windows with readline support failed without the
116        following two fixes: (1) Make the unistd.h include conditional on
117        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
118    
119    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
120        ncurses library to be included for pcretest when ReadLine support is
121        requested, but also to allow for it to be overridden. This patch came from
122        Daniel Bergström.
123    
124    19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
125        as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
126        any errors with the current Unicode tables. Thanks to Peter Kankowski for
127        spotting this.
128    
129    
130    Version 7.6 28-Jan-08
131    ---------------------
132    
133    1.  A character class containing a very large number of characters with
134        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
135        overflow.
136    
137    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
138        HAVE_LONG_LONG is not defined.
139    
140    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
141        bring them up to date and include new features. This patch includes:
142    
143        - Fixed PH's badly added libz and libbz2 support.
144        - Fixed a problem with static linking.
145        - Added pcredemo. [But later removed - see 7 below.]
146        - Fixed dftables problem and added an option.
147        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
148            HAVE_LONG_LONG.
149        - Added readline support for pcretest.
150        - Added an listing of the option settings after cmake has run.
151    
152    4.  A user submitted a patch to Makefile that makes it easy to create
153        "pcre.dll" under mingw when using Configure/Make. I added stuff to
154        Makefile.am that cause it to include this special target, without
155        affecting anything else. Note that the same mingw target plus all
156        the other distribution libraries and programs are now supported
157        when configuring with CMake (see 6 below) instead of with
158        Configure/Make.
159    
160    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
161        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
162        exported in the Windows port". It has not yet been confirmed that the patch
163        solves the problem, but it does no harm.
164    
165    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
166        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
167        with CMake, and also correct the comment about stack recursion.
168    
169    7.  Remove the automatic building of pcredemo from the ./configure system and
170        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
171        of a program that users should build themselves after PCRE is installed, so
172        building it automatically is not really right. What is more, it gave
173        trouble in some build environments.
174    
175    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
176    
177    
178    Version 7.5 10-Jan-08
179    ---------------------
180    
181    1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'
182        values in parens when parsing an RE using the C++ wrapper."
183    
184    2.  Negative specials like \S did not work in character classes in UTF-8 mode.
185        Characters greater than 255 were excluded from the class instead of being
186        included.
187    
188    3.  The same bug as (2) above applied to negated POSIX classes such as
189        [:^space:].
190    
191    4.  PCRECPP_STATIC was referenced in pcrecpp_internal.h, but nowhere was it
192        defined or documented. It seems to have been a typo for PCRE_STATIC, so
193        I have changed it.
194    
195    5.  The construct (?&) was not diagnosed as a syntax error (it referenced the
196        first named subpattern) and a construct such as (?&a) would reference the
197        first named subpattern whose name started with "a" (in other words, the
198        length check was missing). Both these problems are fixed. "Subpattern name
199        expected" is now given for (?&) (a zero-length name), and this patch also
200        makes it give the same error for \k'' (previously it complained that that
201        was a reference to a non-existent subpattern).
202    
203    6.  The erroneous patterns (?+-a) and (?-+a) give different error messages;
204        this is right because (?- can be followed by option settings as well as by
205        digits. I have, however, made the messages clearer.
206    
207    7.  Patterns such as (?(1)a|b) (a pattern that contains fewer subpatterns
208        than the number used in the conditional) now cause a compile-time error.
209        This is actually not compatible with Perl, which accepts such patterns, but
210        treats the conditional as always being FALSE (as PCRE used to), but it
211        seems to me that giving a diagnostic is better.
212    
213    8.  Change "alphameric" to the more common word "alphanumeric" in comments
214        and messages.
215    
216    9.  Fix two occurrences of "backslash" in comments that should have been
217        "backspace".
218    
219    10. Remove two redundant lines of code that can never be obeyed (their function
220        was moved elsewhere).
221    
222    11. The program that makes PCRE's Unicode character property table had a bug
223        which caused it to generate incorrect table entries for sequences of
224        characters that have the same character type, but are in different scripts.
225        It amalgamated them into a single range, with the script of the first of
226        them. In other words, some characters were in the wrong script. There were
227        thirteen such cases, affecting characters in the following ranges:
228    
229          U+002b0 - U+002c1
230          U+0060c - U+0060d
231          U+0061e - U+00612
232          U+0064b - U+0065e
233          U+0074d - U+0076d
234          U+01800 - U+01805
235          U+01d00 - U+01d77
236          U+01d9b - U+01dbf
237          U+0200b - U+0200f
238          U+030fc - U+030fe
239          U+03260 - U+0327f
240          U+0fb46 - U+0fbb1
241          U+10450 - U+1049d
242    
243    12. The -o option (show only the matching part of a line) for pcregrep was not
244        compatible with GNU grep in that, if there was more than one match in a
245        line, it showed only the first of them. It now behaves in the same way as
246        GNU grep.
247    
248    13. If the -o and -v options were combined for pcregrep, it printed a blank
249        line for every non-matching line. GNU grep prints nothing, and pcregrep now
250        does the same. The return code can be used to tell if there were any
251        non-matching lines.
252    
253    14. Added --file-offsets and --line-offsets to pcregrep.
254    
255    15. The pattern (?=something)(?R) was not being diagnosed as a potentially
256        infinitely looping recursion. The bug was that positive lookaheads were not
257        being skipped when checking for a possible empty match (negative lookaheads
258        and both kinds of lookbehind were skipped).
259    
260    16. Fixed two typos in the Windows-only code in pcregrep.c, and moved the
261        inclusion of <windows.h> to before rather than after the definition of
262        INVALID_FILE_ATTRIBUTES (patch from David Byron).
263    
264    17. Specifying a possessive quantifier with a specific limit for a Unicode
265        character property caused pcre_compile() to compile bad code, which led at
266        runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this
267        are: /\p{Zl}{2,3}+/8 and /\p{Cc}{2}+/8. It was the possessive "+" that
268        caused the error; without that there was no problem.
269    
270    18. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.
271    
272    19. Added --enable-pcretest-libreadline.
273    
274    20. In pcrecpp.cc, the variable 'count' was incremented twice in
275        RE::GlobalReplace(). As a result, the number of replacements returned was
276        double what it should be. I removed one of the increments, but Craig sent a
277        later patch that removed the other one (the right fix) and added unit tests
278        that check the return values (which was not done before).
279    
280    21. Several CMake things:
281    
282        (1) Arranged that, when cmake is used on Unix, the libraries end up with
283            the names libpcre and libpcreposix, not just pcre and pcreposix.
284    
285        (2) The above change means that pcretest and pcregrep are now correctly
286            linked with the newly-built libraries, not previously installed ones.
287    
288        (3) Added PCRE_SUPPORT_LIBREADLINE, PCRE_SUPPORT_LIBZ, PCRE_SUPPORT_LIBBZ2.
289    
290    22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
291        crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
292        UTF-8 newline character). The key issue is that the pattern starts .*;
293        this means that the match must be either at the beginning, or after a
294        newline. The bug was in the code for advancing after a failed match and
295        checking that the new position followed a newline. It was not taking
296        account of UTF-8 characters correctly.
297    
298    23. PCRE was behaving differently from Perl in the way it recognized POSIX
299        character classes. PCRE was not treating the sequence [:...:] as a
300        character class unless the ... were all letters. Perl, however, seems to
301        allow any characters between [: and :], though of course it rejects as
302        unknown any "names" that contain non-letters, because all the known class
303        names consist only of letters. Thus, Perl gives an error for [[:1234:]],
304        for example, whereas PCRE did not - it did not recognize a POSIX character
305        class. This seemed a bit dangerous, so the code has been changed to be
306        closer to Perl. The behaviour is not identical to Perl, because PCRE will
307        diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
308        treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
309        Perl does, and where it didn't before.
310    
311    24. Rewrite so as to remove the single use of %n from pcregrep because in some
312        Windows environments %n is disabled by default.
313    
314    
315    Version 7.4 21-Sep-07
316    ---------------------
317    
318    1.  Change 7.3/28 was implemented for classes by looking at the bitmap. This
319        means that a class such as [\s] counted as "explicit reference to CR or
320        LF". That isn't really right - the whole point of the change was to try to
321        help when there was an actual mention of one of the two characters. So now
322        the change happens only if \r or \n (or a literal CR or LF) character is
323        encountered.
324    
325    2.  The 32-bit options word was also used for 6 internal flags, but the numbers
326        of both had grown to the point where there were only 3 bits left.
327        Fortunately, there was spare space in the data structure, and so I have
328        moved the internal flags into a new 16-bit field to free up more option
329        bits.
330    
331    3.  The appearance of (?J) at the start of a pattern set the DUPNAMES option,
332        but did not set the internal JCHANGED flag - either of these is enough to
333        control the way the "get" function works - but the PCRE_INFO_JCHANGED
334        facility is supposed to tell if (?J) was ever used, so now (?J) at the
335        start sets both bits.
336    
337    4.  Added options (at build time, compile time, exec time) to change \R from
338        matching any Unicode line ending sequence to just matching CR, LF, or CRLF.
339    
340    5.  doc/pcresyntax.html was missing from the distribution.
341    
342    6.  Put back the definition of PCRE_ERROR_NULLWSLIMIT, for backward
343        compatibility, even though it is no longer used.
344    
345    7.  Added macro for snprintf to pcrecpp_unittest.cc and also for strtoll and
346        strtoull to pcrecpp.cc to select the available functions in WIN32 when the
347        windows.h file is present (where different names are used). [This was
348        reversed later after testing - see 16 below.]
349    
350    8.  Changed all #include <config.h> to #include "config.h". There were also
351        some further <pcre.h> cases that I changed to "pcre.h".
352    
353    9.  When pcregrep was used with the --colour option, it missed the line ending
354        sequence off the lines that it output.
355    
356    10. It was pointed out to me that arrays of string pointers cause lots of
357        relocations when a shared library is dynamically loaded. A technique of
358        using a single long string with a table of offsets can drastically reduce
359        these. I have refactored PCRE in four places to do this. The result is
360        dramatic:
361    
362          Originally:                          290
363          After changing UCP table:            187
364          After changing error message table:   43
365          After changing table of "verbs"       36
366          After changing table of Posix names   22
367    
368        Thanks to the folks working on Gregex for glib for this insight.
369    
370    11. --disable-stack-for-recursion caused compiling to fail unless -enable-
371        unicode-properties was also set.
372    
373    12. Updated the tests so that they work when \R is defaulted to ANYCRLF.
374    
375    13. Added checks for ANY and ANYCRLF to pcrecpp.cc where it previously
376        checked only for CRLF.
377    
378    14. Added casts to pcretest.c to avoid compiler warnings.
379    
380    15. Added Craig's patch to various pcrecpp modules to avoid compiler warnings.
381    
382    16. Added Craig's patch to remove the WINDOWS_H tests, that were not working,
383        and instead check for _strtoi64 explicitly, and avoid the use of snprintf()
384        entirely. This removes changes made in 7 above.
385    
386    17. The CMake files have been updated, and there is now more information about
387        building with CMake in the NON-UNIX-USE document.
388    
389    
390    Version 7.3 28-Aug-07
391    ---------------------
392    
393     1. In the rejigging of the build system that eventually resulted in 7.1, the
394        line "#include <pcre.h>" was included in pcre_internal.h. The use of angle
395        brackets there is not right, since it causes compilers to look for an
396        installed pcre.h, not the version that is in the source that is being
397        compiled (which of course may be different). I have changed it back to:
398    
399          #include "pcre.h"
400    
401        I have a vague recollection that the change was concerned with compiling in
402        different directories, but in the new build system, that is taken care of
403        by the VPATH setting the Makefile.
404    
405     2. The pattern .*$ when run in not-DOTALL UTF-8 mode with newline=any failed
406        when the subject happened to end in the byte 0x85 (e.g. if the last
407        character was \x{1ec5}). *Character* 0x85 is one of the "any" newline
408        characters but of course it shouldn't be taken as a newline when it is part
409        of another character. The bug was that, for an unlimited repeat of . in
410        not-DOTALL UTF-8 mode, PCRE was advancing by bytes rather than by
411        characters when looking for a newline.
412    
413     3. A small performance improvement in the DOTALL UTF-8 mode .* case.
414    
415     4. Debugging: adjusted the names of opcodes for different kinds of parentheses
416        in debug output.
417    
418     5. Arrange to use "%I64d" instead of "%lld" and "%I64u" instead of "%llu" for
419        long printing in the pcrecpp unittest when running under MinGW.
420    
421     6. ESC_K was left out of the EBCDIC table.
422    
423     7. Change 7.0/38 introduced a new limit on the number of nested non-capturing
424        parentheses; I made it 1000, which seemed large enough. Unfortunately, the
425        limit also applies to "virtual nesting" when a pattern is recursive, and in
426        this case 1000 isn't so big. I have been able to remove this limit at the
427        expense of backing off one optimization in certain circumstances. Normally,
428        when pcre_exec() would call its internal match() function recursively and
429        immediately return the result unconditionally, it uses a "tail recursion"
430        feature to save stack. However, when a subpattern that can match an empty
431        string has an unlimited repetition quantifier, it no longer makes this
432        optimization. That gives it a stack frame in which to save the data for
433        checking that an empty string has been matched. Previously this was taken
434        from the 1000-entry workspace that had been reserved. So now there is no
435        explicit limit, but more stack is used.
436    
437     8. Applied Daniel's patches to solve problems with the import/export magic
438        syntax that is required for Windows, and which was going wrong for the
439        pcreposix and pcrecpp parts of the library. These were overlooked when this
440        problem was solved for the main library.
441    
442     9. There were some crude static tests to avoid integer overflow when computing
443        the size of patterns that contain repeated groups with explicit upper
444        limits. As the maximum quantifier is 65535, the maximum group length was
445        set at 30,000 so that the product of these two numbers did not overflow a
446        32-bit integer. However, it turns out that people want to use groups that
447        are longer than 30,000 bytes (though not repeat them that many times).
448        Change 7.0/17 (the refactoring of the way the pattern size is computed) has
449        made it possible to implement the integer overflow checks in a much more
450        dynamic way, which I have now done. The artificial limitation on group
451        length has been removed - we now have only the limit on the total length of
452        the compiled pattern, which depends on the LINK_SIZE setting.
453    
454    10. Fixed a bug in the documentation for get/copy named substring when
455        duplicate names are permitted. If none of the named substrings are set, the
456        functions return PCRE_ERROR_NOSUBSTRING (7); the doc said they returned an
457        empty string.
458    
459    11. Because Perl interprets \Q...\E at a high level, and ignores orphan \E
460        instances, patterns such as [\Q\E] or [\E] or even [^\E] cause an error,
461        because the ] is interpreted as the first data character and the
462        terminating ] is not found. PCRE has been made compatible with Perl in this
463        regard. Previously, it interpreted [\Q\E] as an empty class, and [\E] could
464        cause memory overwriting.
465    
466    10. Like Perl, PCRE automatically breaks an unlimited repeat after an empty
467        string has been matched (to stop an infinite loop). It was not recognizing
468        a conditional subpattern that could match an empty string if that
469        subpattern was within another subpattern. For example, it looped when
470        trying to match  (((?(1)X|))*)  but it was OK with  ((?(1)X|)*)  where the
471        condition was not nested. This bug has been fixed.
472    
473    12. A pattern like \X?\d or \P{L}?\d in non-UTF-8 mode could cause a backtrack
474        past the start of the subject in the presence of bytes with the top bit
475        set, for example "\x8aBCD".
476    
477    13. Added Perl 5.10 experimental backtracking controls (*FAIL), (*F), (*PRUNE),
478        (*SKIP), (*THEN), (*COMMIT), and (*ACCEPT).
479    
480    14. Optimized (?!) to (*FAIL).
481    
482    15. Updated the test for a valid UTF-8 string to conform to the later RFC 3629.
483        This restricts code points to be within the range 0 to 0x10FFFF, excluding
484        the "low surrogate" sequence 0xD800 to 0xDFFF. Previously, PCRE allowed the
485        full range 0 to 0x7FFFFFFF, as defined by RFC 2279. Internally, it still
486        does: it's just the validity check that is more restrictive.
487    
488    16. Inserted checks for integer overflows during escape sequence (backslash)
489        processing, and also fixed erroneous offset values for syntax errors during
490        backslash processing.
491    
492    17. Fixed another case of looking too far back in non-UTF-8 mode (cf 12 above)
493        for patterns like [\PPP\x8a]{1,}\x80 with the subject "A\x80".
494    
495    18. An unterminated class in a pattern like (?1)\c[ with a "forward reference"
496        caused an overrun.
497    
498    19. A pattern like (?:[\PPa*]*){8,} which had an "extended class" (one with
499        something other than just ASCII characters) inside a group that had an
500        unlimited repeat caused a loop at compile time (while checking to see
501        whether the group could match an empty string).
502    
503    20. Debugging a pattern containing \p or \P could cause a crash. For example,
504        [\P{Any}] did so. (Error in the code for printing property names.)
505    
506    21. An orphan \E inside a character class could cause a crash.
507    
508    22. A repeated capturing bracket such as (A)? could cause a wild memory
509        reference during compilation.
510    
511    23. There are several functions in pcre_compile() that scan along a compiled
512        expression for various reasons (e.g. to see if it's fixed length for look
513        behind). There were bugs in these functions when a repeated \p or \P was
514        present in the pattern. These operators have additional parameters compared
515        with \d, etc, and these were not being taken into account when moving along
516        the compiled data. Specifically:
517    
518        (a) A item such as \p{Yi}{3} in a lookbehind was not treated as fixed
519            length.
520    
521        (b) An item such as \pL+ within a repeated group could cause crashes or
522            loops.
523    
524        (c) A pattern such as \p{Yi}+(\P{Yi}+)(?1) could give an incorrect
525            "reference to non-existent subpattern" error.
526    
527        (d) A pattern like (\P{Yi}{2}\277)? could loop at compile time.
528    
529    24. A repeated \S or \W in UTF-8 mode could give wrong answers when multibyte
530        characters were involved (for example /\S{2}/8g with "A\x{a3}BC").
531    
532    25. Using pcregrep in multiline, inverted mode (-Mv) caused it to loop.
533    
534    26. Patterns such as [\P{Yi}A] which include \p or \P and just one other
535        character were causing crashes (broken optimization).
536    
537    27. Patterns such as (\P{Yi}*\277)* (group with possible zero repeat containing
538        \p or \P) caused a compile-time loop.
539    
540    28. More problems have arisen in unanchored patterns when CRLF is a valid line
541        break. For example, the unstudied pattern [\r\n]A does not match the string
542        "\r\nA" because change 7.0/46 below moves the current point on by two
543        characters after failing to match at the start. However, the pattern \nA
544        *does* match, because it doesn't start till \n, and if [\r\n]A is studied,
545        the same is true. There doesn't seem any very clean way out of this, but
546        what I have chosen to do makes the common cases work: PCRE now takes note
547        of whether there can be an explicit match for \r or \n anywhere in the
548        pattern, and if so, 7.0/46 no longer applies. As part of this change,
549        there's a new PCRE_INFO_HASCRORLF option for finding out whether a compiled
550        pattern has explicit CR or LF references.
551    
552    29. Added (*CR) etc for changing newline setting at start of pattern.
553    
554    
555    Version 7.2 19-Jun-07
556    ---------------------
557    
558     1. If the fr_FR locale cannot be found for test 3, try the "french" locale,
559        which is apparently normally available under Windows.
560    
561     2. Re-jig the pcregrep tests with different newline settings in an attempt
562        to make them independent of the local environment's newline setting.
563    
564     3. Add code to configure.ac to remove -g from the CFLAGS default settings.
565    
566     4. Some of the "internals" tests were previously cut out when the link size
567        was not 2, because the output contained actual offsets. The recent new
568        "Z" feature of pcretest means that these can be cut out, making the tests
569        usable with all link sizes.
570    
571     5. Implemented Stan Switzer's goto replacement for longjmp() when not using
572        stack recursion. This gives a massive performance boost under BSD, but just
573        a small improvement under Linux. However, it saves one field in the frame
574        in all cases.
575    
576     6. Added more features from the forthcoming Perl 5.10:
577    
578        (a) (?-n) (where n is a string of digits) is a relative subroutine or
579            recursion call. It refers to the nth most recently opened parentheses.
580    
581        (b) (?+n) is also a relative subroutine call; it refers to the nth next
582            to be opened parentheses.
583    
584        (c) Conditions that refer to capturing parentheses can be specified
585            relatively, for example, (?(-2)... or (?(+3)...
586    
587        (d) \K resets the start of the current match so that everything before
588            is not part of it.
589    
590        (e) \k{name} is synonymous with \k<name> and \k'name' (.NET compatible).
591    
592        (f) \g{name} is another synonym - part of Perl 5.10's unification of
593            reference syntax.
594    
595        (g) (?| introduces a group in which the numbering of parentheses in each
596            alternative starts with the same number.
597    
598        (h) \h, \H, \v, and \V match horizontal and vertical whitespace.
599    
600     7. Added two new calls to pcre_fullinfo(): PCRE_INFO_OKPARTIAL and
601        PCRE_INFO_JCHANGED.
602    
603     8. A pattern such as  (.*(.)?)*  caused pcre_exec() to fail by either not
604        terminating or by crashing. Diagnosed by Viktor Griph; it was in the code
605        for detecting groups that can match an empty string.
606    
607     9. A pattern with a very large number of alternatives (more than several
608        hundred) was running out of internal workspace during the pre-compile
609        phase, where pcre_compile() figures out how much memory will be needed. A
610        bit of new cunning has reduced the workspace needed for groups with
611        alternatives. The 1000-alternative test pattern now uses 12 bytes of
612        workspace instead of running out of the 4096 that are available.
613    
614    10. Inserted some missing (unsigned int) casts to get rid of compiler warnings.
615    
616    11. Applied patch from Google to remove an optimization that didn't quite work.
617        The report of the bug said:
618    
619          pcrecpp::RE("a*").FullMatch("aaa") matches, while
620          pcrecpp::RE("a*?").FullMatch("aaa") does not, and
621          pcrecpp::RE("a*?\\z").FullMatch("aaa") does again.
622    
623    12. If \p or \P was used in non-UTF-8 mode on a character greater than 127
624        it matched the wrong number of bytes.
625    
626    
627    Version 7.1 24-Apr-07
628  ---------------------  ---------------------
629    
630   1. Applied Bob Rossi and Daniel G's patches to convert the build system to one   1. Applied Bob Rossi and Daniel G's patches to convert the build system to one
# Line 135  Version 7.1 12-Mar-07 Line 758  Version 7.1 12-Mar-07
758      was because its rules for how to advance for /g after matching an empty      was because its rules for how to advance for /g after matching an empty
759      string at the end of a line did not allow for this case. They now check for      string at the end of a line did not allow for this case. They now check for
760      it specially.      it specially.
761    
762  20. pcretest is supposed to handle patterns and data of any length, by  20. pcretest is supposed to handle patterns and data of any length, by
763      extending its buffers when necessary. It was getting this wrong when the      extending its buffers when necessary. It was getting this wrong when the
764      buffer for a data line had to be extended.      buffer for a data line had to be extended.
765    
766  21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or  21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or
767      CRLF as a newline sequence.      CRLF as a newline sequence.
768    
769    22. Code for handling Unicode properties in pcre_dfa_exec() wasn't being cut
770        out by #ifdef SUPPORT_UCP. This did no harm, as it could never be used, but
771        I have nevertheless tidied it up.
772    
773    23. Added some casts to kill warnings from HP-UX ia64 compiler.
774    
775    24. Added a man page for pcre-config.
776    
777    
778  Version 7.0 19-Dec-06  Version 7.0 19-Dec-06

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