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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 7.1 12-Mar-07  Version 8.0 02 Jul-08
5    ---------------------
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).
14    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
15        scripts.
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.
21    4.  Caseless matching was not working for non-ASCII characters in back
22        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
23        It now works when Unicode Property Support is available.
25    5.  In pcretest, an escape such as \x{de} in the data was always generating
26        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
27        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
28        truncation.
30    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
32    7.  Added two (int) casts to pcregrep when printing the difference of two
33        pointers, in case they are 64-bit values.
35    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
36        test 2 if it fails.
38    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
39        and a #define of that name to empty if it is not externally set. This is to
40        allow users of MSVC to set it if necessary.
42    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
43        the convenience functions in the pcre_get.c source file.
45    11. An option change at the start of a pattern that had top-level alternatives
46        could cause overwriting and/or a crash. This command provoked a crash in
47        some environments:
49          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
51        This potential security problem was recorded as CVE-2008-2371.
54    Version 7.7 07-May-08
55    ---------------------
57    1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
58        a string to a long long, pretend we don't even have a long long." This is
59        done by checking for the strtoq, strtoll, and _strtoi64 functions.
61    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
62        pre-7.6 versions, which defined a global no_arg variable instead of putting
63        it in the RE class. (See also #8 below.)
65    3.  Remove a line of dead code, identified by coverity and reported by Nuno
66        Lopes.
68    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
70        (1) The include/exclude patterns were being applied to the whole pathnames
71            of files, instead of just to the final components.
73        (2) If there was more than one level of directory, the subdirectories were
74            skipped unless they satisfied the include/exclude conditions. This is
75            inconsistent with GNU grep (and could even be seen as contrary to the
76            pcregrep specification - which I improved to make it absolutely clear).
77            The action now is always to scan all levels of directory, and just
78            apply the include/exclude patterns to regular files.
80    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
81        --exclude_dir in the tests to avoid scanning .svn directories.
83    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
84        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
85        doesn't support NULs in patterns.
87    7.  Added some missing "const"s to declarations of static tables in
88        pcre_compile.c and pcre_dfa_exec.c.
90    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
91        caused by fix #2  above. (Subsequently also a second patch to fix the
92        first patch. And a third patch - this was a messy problem.)
94    9.  Applied Craig's patch to remove the use of push_back().
96    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
97        matching function regexec().
99    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
100        which, however, unlike Perl's \g{...}, are subroutine calls, not back
101        references. PCRE supports relative numbers with this syntax (I don't think
102        Oniguruma does).
104    12. Previously, a group with a zero repeat such as (...){0} was completely
105        omitted from the compiled regex. However, this means that if the group
106        was called as a subroutine from elsewhere in the pattern, things went wrong
107        (an internal error was given). Such groups are now left in the compiled
108        pattern, with a new opcode that causes them to be skipped at execution
109        time.
111    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
112        to the way PCRE behaves:
114        (a) A lone ] character is dis-allowed (Perl treats it as data).
116        (b) A back reference to an unmatched subpattern matches an empty string
117            (Perl fails the current match path).
119        (c) A data ] in a character class must be notated as \] because if the
120            first data character in a class is ], it defines an empty class. (In
121            Perl it is not possible to have an empty class.) The empty class []
122            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
123            The negative empty class [^] matches any one character, independently
124            of the DOTALL setting.
126    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
127        non-existent subpattern following a character class starting with ']' and
128        containing () gave an internal compiling error instead of "reference to
129        non-existent subpattern". Fortunately, when the pattern did exist, the
130        compiled code was correct. (When scanning forwards to check for the
131        existencd of the subpattern, it was treating the data ']' as terminating
132        the class, so got the count wrong. When actually compiling, the reference
133        was subsequently set up correctly.)
135    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
136        it was being rejected as not supported by pcre_dfa_exec(), even though
137        other assertions are supported. I have made pcre_dfa_exec() support
138        (*FAIL).
140    16. The implementation of 13c above involved the invention of a new opcode,
141        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
142        cannot be changed at match time, I realized I could make a small
143        improvement to matching performance by compiling OP_ALLANY instead of
144        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
145        on the OP_ANY path.
147    17. Compiling pcretest on Windows with readline support failed without the
148        following two fixes: (1) Make the unistd.h include conditional on
149        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
151    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
152        ncurses library to be included for pcretest when ReadLine support is
153        requested, but also to allow for it to be overridden. This patch came from
154        Daniel Bergström.
156    19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
157        as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
158        any errors with the current Unicode tables. Thanks to Peter Kankowski for
159        spotting this.
162    Version 7.6 28-Jan-08
163    ---------------------
165    1.  A character class containing a very large number of characters with
166        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
167        overflow.
169    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
170        HAVE_LONG_LONG is not defined.
172    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
173        bring them up to date and include new features. This patch includes:
175        - Fixed PH's badly added libz and libbz2 support.
176        - Fixed a problem with static linking.
177        - Added pcredemo. [But later removed - see 7 below.]
178        - Fixed dftables problem and added an option.
179        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
180            HAVE_LONG_LONG.
181        - Added readline support for pcretest.
182        - Added an listing of the option settings after cmake has run.
184    4.  A user submitted a patch to Makefile that makes it easy to create
185        "pcre.dll" under mingw when using Configure/Make. I added stuff to
186        Makefile.am that cause it to include this special target, without
187        affecting anything else. Note that the same mingw target plus all
188        the other distribution libraries and programs are now supported
189        when configuring with CMake (see 6 below) instead of with
190        Configure/Make.
192    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
193        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
194        exported in the Windows port". It has not yet been confirmed that the patch
195        solves the problem, but it does no harm.
197    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
198        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
199        with CMake, and also correct the comment about stack recursion.
201    7.  Remove the automatic building of pcredemo from the ./configure system and
202        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
203        of a program that users should build themselves after PCRE is installed, so
204        building it automatically is not really right. What is more, it gave
205        trouble in some build environments.
207    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
210    Version 7.5 10-Jan-08
211    ---------------------
213    1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'
214        values in parens when parsing an RE using the C++ wrapper."
216    2.  Negative specials like \S did not work in character classes in UTF-8 mode.
217        Characters greater than 255 were excluded from the class instead of being
218        included.
220    3.  The same bug as (2) above applied to negated POSIX classes such as
221        [:^space:].
223    4.  PCRECPP_STATIC was referenced in pcrecpp_internal.h, but nowhere was it
224        defined or documented. It seems to have been a typo for PCRE_STATIC, so
225        I have changed it.
227    5.  The construct (?&) was not diagnosed as a syntax error (it referenced the
228        first named subpattern) and a construct such as (?&a) would reference the
229        first named subpattern whose name started with "a" (in other words, the
230        length check was missing). Both these problems are fixed. "Subpattern name
231        expected" is now given for (?&) (a zero-length name), and this patch also
232        makes it give the same error for \k'' (previously it complained that that
233        was a reference to a non-existent subpattern).
235    6.  The erroneous patterns (?+-a) and (?-+a) give different error messages;
236        this is right because (?- can be followed by option settings as well as by
237        digits. I have, however, made the messages clearer.
239    7.  Patterns such as (?(1)a|b) (a pattern that contains fewer subpatterns
240        than the number used in the conditional) now cause a compile-time error.
241        This is actually not compatible with Perl, which accepts such patterns, but
242        treats the conditional as always being FALSE (as PCRE used to), but it
243        seems to me that giving a diagnostic is better.
245    8.  Change "alphameric" to the more common word "alphanumeric" in comments
246        and messages.
248    9.  Fix two occurrences of "backslash" in comments that should have been
249        "backspace".
251    10. Remove two redundant lines of code that can never be obeyed (their function
252        was moved elsewhere).
254    11. The program that makes PCRE's Unicode character property table had a bug
255        which caused it to generate incorrect table entries for sequences of
256        characters that have the same character type, but are in different scripts.
257        It amalgamated them into a single range, with the script of the first of
258        them. In other words, some characters were in the wrong script. There were
259        thirteen such cases, affecting characters in the following ranges:
261          U+002b0 - U+002c1
262          U+0060c - U+0060d
263          U+0061e - U+00612
264          U+0064b - U+0065e
265          U+0074d - U+0076d
266          U+01800 - U+01805
267          U+01d00 - U+01d77
268          U+01d9b - U+01dbf
269          U+0200b - U+0200f
270          U+030fc - U+030fe
271          U+03260 - U+0327f
272          U+0fb46 - U+0fbb1
273          U+10450 - U+1049d
275    12. The -o option (show only the matching part of a line) for pcregrep was not
276        compatible with GNU grep in that, if there was more than one match in a
277        line, it showed only the first of them. It now behaves in the same way as
278        GNU grep.
280    13. If the -o and -v options were combined for pcregrep, it printed a blank
281        line for every non-matching line. GNU grep prints nothing, and pcregrep now
282        does the same. The return code can be used to tell if there were any
283        non-matching lines.
285    14. Added --file-offsets and --line-offsets to pcregrep.
287    15. The pattern (?=something)(?R) was not being diagnosed as a potentially
288        infinitely looping recursion. The bug was that positive lookaheads were not
289        being skipped when checking for a possible empty match (negative lookaheads
290        and both kinds of lookbehind were skipped).
292    16. Fixed two typos in the Windows-only code in pcregrep.c, and moved the
293        inclusion of <windows.h> to before rather than after the definition of
294        INVALID_FILE_ATTRIBUTES (patch from David Byron).
296    17. Specifying a possessive quantifier with a specific limit for a Unicode
297        character property caused pcre_compile() to compile bad code, which led at
298        runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this
299        are: /\p{Zl}{2,3}+/8 and /\p{Cc}{2}+/8. It was the possessive "+" that
300        caused the error; without that there was no problem.
302    18. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.
304    19. Added --enable-pcretest-libreadline.
306    20. In pcrecpp.cc, the variable 'count' was incremented twice in
307        RE::GlobalReplace(). As a result, the number of replacements returned was
308        double what it should be. I removed one of the increments, but Craig sent a
309        later patch that removed the other one (the right fix) and added unit tests
310        that check the return values (which was not done before).
312    21. Several CMake things:
314        (1) Arranged that, when cmake is used on Unix, the libraries end up with
315            the names libpcre and libpcreposix, not just pcre and pcreposix.
317        (2) The above change means that pcretest and pcregrep are now correctly
318            linked with the newly-built libraries, not previously installed ones.
322    22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
323        crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
324        UTF-8 newline character). The key issue is that the pattern starts .*;
325        this means that the match must be either at the beginning, or after a
326        newline. The bug was in the code for advancing after a failed match and
327        checking that the new position followed a newline. It was not taking
328        account of UTF-8 characters correctly.
330    23. PCRE was behaving differently from Perl in the way it recognized POSIX
331        character classes. PCRE was not treating the sequence [:...:] as a
332        character class unless the ... were all letters. Perl, however, seems to
333        allow any characters between [: and :], though of course it rejects as
334        unknown any "names" that contain non-letters, because all the known class
335        names consist only of letters. Thus, Perl gives an error for [[:1234:]],
336        for example, whereas PCRE did not - it did not recognize a POSIX character
337        class. This seemed a bit dangerous, so the code has been changed to be
338        closer to Perl. The behaviour is not identical to Perl, because PCRE will
339        diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
340        treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
341        Perl does, and where it didn't before.
343    24. Rewrite so as to remove the single use of %n from pcregrep because in some
344        Windows environments %n is disabled by default.
347    Version 7.4 21-Sep-07
348    ---------------------
350    1.  Change 7.3/28 was implemented for classes by looking at the bitmap. This
351        means that a class such as [\s] counted as "explicit reference to CR or
352        LF". That isn't really right - the whole point of the change was to try to
353        help when there was an actual mention of one of the two characters. So now
354        the change happens only if \r or \n (or a literal CR or LF) character is
355        encountered.
357    2.  The 32-bit options word was also used for 6 internal flags, but the numbers
358        of both had grown to the point where there were only 3 bits left.
359        Fortunately, there was spare space in the data structure, and so I have
360        moved the internal flags into a new 16-bit field to free up more option
361        bits.
363    3.  The appearance of (?J) at the start of a pattern set the DUPNAMES option,
364        but did not set the internal JCHANGED flag - either of these is enough to
365        control the way the "get" function works - but the PCRE_INFO_JCHANGED
366        facility is supposed to tell if (?J) was ever used, so now (?J) at the
367        start sets both bits.
369    4.  Added options (at build time, compile time, exec time) to change \R from
370        matching any Unicode line ending sequence to just matching CR, LF, or CRLF.
372    5.  doc/pcresyntax.html was missing from the distribution.
374    6.  Put back the definition of PCRE_ERROR_NULLWSLIMIT, for backward
375        compatibility, even though it is no longer used.
377    7.  Added macro for snprintf to pcrecpp_unittest.cc and also for strtoll and
378        strtoull to pcrecpp.cc to select the available functions in WIN32 when the
379        windows.h file is present (where different names are used). [This was
380        reversed later after testing - see 16 below.]
382    8.  Changed all #include <config.h> to #include "config.h". There were also
383        some further <pcre.h> cases that I changed to "pcre.h".
385    9.  When pcregrep was used with the --colour option, it missed the line ending
386        sequence off the lines that it output.
388    10. It was pointed out to me that arrays of string pointers cause lots of
389        relocations when a shared library is dynamically loaded. A technique of
390        using a single long string with a table of offsets can drastically reduce
391        these. I have refactored PCRE in four places to do this. The result is
392        dramatic:
394          Originally:                          290
395          After changing UCP table:            187
396          After changing error message table:   43
397          After changing table of "verbs"       36
398          After changing table of Posix names   22
400        Thanks to the folks working on Gregex for glib for this insight.
402    11. --disable-stack-for-recursion caused compiling to fail unless -enable-
403        unicode-properties was also set.
405    12. Updated the tests so that they work when \R is defaulted to ANYCRLF.
407    13. Added checks for ANY and ANYCRLF to pcrecpp.cc where it previously
408        checked only for CRLF.
410    14. Added casts to pcretest.c to avoid compiler warnings.
412    15. Added Craig's patch to various pcrecpp modules to avoid compiler warnings.
414    16. Added Craig's patch to remove the WINDOWS_H tests, that were not working,
415        and instead check for _strtoi64 explicitly, and avoid the use of snprintf()
416        entirely. This removes changes made in 7 above.
418    17. The CMake files have been updated, and there is now more information about
419        building with CMake in the NON-UNIX-USE document.
422    Version 7.3 28-Aug-07
423    ---------------------
425     1. In the rejigging of the build system that eventually resulted in 7.1, the
426        line "#include <pcre.h>" was included in pcre_internal.h. The use of angle
427        brackets there is not right, since it causes compilers to look for an
428        installed pcre.h, not the version that is in the source that is being
429        compiled (which of course may be different). I have changed it back to:
431          #include "pcre.h"
433        I have a vague recollection that the change was concerned with compiling in
434        different directories, but in the new build system, that is taken care of
435        by the VPATH setting the Makefile.
437     2. The pattern .*$ when run in not-DOTALL UTF-8 mode with newline=any failed
438        when the subject happened to end in the byte 0x85 (e.g. if the last
439        character was \x{1ec5}). *Character* 0x85 is one of the "any" newline
440        characters but of course it shouldn't be taken as a newline when it is part
441        of another character. The bug was that, for an unlimited repeat of . in
442        not-DOTALL UTF-8 mode, PCRE was advancing by bytes rather than by
443        characters when looking for a newline.
445     3. A small performance improvement in the DOTALL UTF-8 mode .* case.
447     4. Debugging: adjusted the names of opcodes for different kinds of parentheses
448        in debug output.
450     5. Arrange to use "%I64d" instead of "%lld" and "%I64u" instead of "%llu" for
451        long printing in the pcrecpp unittest when running under MinGW.
453     6. ESC_K was left out of the EBCDIC table.
455     7. Change 7.0/38 introduced a new limit on the number of nested non-capturing
456        parentheses; I made it 1000, which seemed large enough. Unfortunately, the
457        limit also applies to "virtual nesting" when a pattern is recursive, and in
458        this case 1000 isn't so big. I have been able to remove this limit at the
459        expense of backing off one optimization in certain circumstances. Normally,
460        when pcre_exec() would call its internal match() function recursively and
461        immediately return the result unconditionally, it uses a "tail recursion"
462        feature to save stack. However, when a subpattern that can match an empty
463        string has an unlimited repetition quantifier, it no longer makes this
464        optimization. That gives it a stack frame in which to save the data for
465        checking that an empty string has been matched. Previously this was taken
466        from the 1000-entry workspace that had been reserved. So now there is no
467        explicit limit, but more stack is used.
469     8. Applied Daniel's patches to solve problems with the import/export magic
470        syntax that is required for Windows, and which was going wrong for the
471        pcreposix and pcrecpp parts of the library. These were overlooked when this
472        problem was solved for the main library.
474     9. There were some crude static tests to avoid integer overflow when computing
475        the size of patterns that contain repeated groups with explicit upper
476        limits. As the maximum quantifier is 65535, the maximum group length was
477        set at 30,000 so that the product of these two numbers did not overflow a
478        32-bit integer. However, it turns out that people want to use groups that
479        are longer than 30,000 bytes (though not repeat them that many times).
480        Change 7.0/17 (the refactoring of the way the pattern size is computed) has
481        made it possible to implement the integer overflow checks in a much more
482        dynamic way, which I have now done. The artificial limitation on group
483        length has been removed - we now have only the limit on the total length of
484        the compiled pattern, which depends on the LINK_SIZE setting.
486    10. Fixed a bug in the documentation for get/copy named substring when
487        duplicate names are permitted. If none of the named substrings are set, the
488        functions return PCRE_ERROR_NOSUBSTRING (7); the doc said they returned an
489        empty string.
491    11. Because Perl interprets \Q...\E at a high level, and ignores orphan \E
492        instances, patterns such as [\Q\E] or [\E] or even [^\E] cause an error,
493        because the ] is interpreted as the first data character and the
494        terminating ] is not found. PCRE has been made compatible with Perl in this
495        regard. Previously, it interpreted [\Q\E] as an empty class, and [\E] could
496        cause memory overwriting.
498    10. Like Perl, PCRE automatically breaks an unlimited repeat after an empty
499        string has been matched (to stop an infinite loop). It was not recognizing
500        a conditional subpattern that could match an empty string if that
501        subpattern was within another subpattern. For example, it looped when
502        trying to match  (((?(1)X|))*)  but it was OK with  ((?(1)X|)*)  where the
503        condition was not nested. This bug has been fixed.
505    12. A pattern like \X?\d or \P{L}?\d in non-UTF-8 mode could cause a backtrack
506        past the start of the subject in the presence of bytes with the top bit
507        set, for example "\x8aBCD".
509    13. Added Perl 5.10 experimental backtracking controls (*FAIL), (*F), (*PRUNE),
510        (*SKIP), (*THEN), (*COMMIT), and (*ACCEPT).
512    14. Optimized (?!) to (*FAIL).
514    15. Updated the test for a valid UTF-8 string to conform to the later RFC 3629.
515        This restricts code points to be within the range 0 to 0x10FFFF, excluding
516        the "low surrogate" sequence 0xD800 to 0xDFFF. Previously, PCRE allowed the
517        full range 0 to 0x7FFFFFFF, as defined by RFC 2279. Internally, it still
518        does: it's just the validity check that is more restrictive.
520    16. Inserted checks for integer overflows during escape sequence (backslash)
521        processing, and also fixed erroneous offset values for syntax errors during
522        backslash processing.
524    17. Fixed another case of looking too far back in non-UTF-8 mode (cf 12 above)
525        for patterns like [\PPP\x8a]{1,}\x80 with the subject "A\x80".
527    18. An unterminated class in a pattern like (?1)\c[ with a "forward reference"
528        caused an overrun.
530    19. A pattern like (?:[\PPa*]*){8,} which had an "extended class" (one with
531        something other than just ASCII characters) inside a group that had an
532        unlimited repeat caused a loop at compile time (while checking to see
533        whether the group could match an empty string).
535    20. Debugging a pattern containing \p or \P could cause a crash. For example,
536        [\P{Any}] did so. (Error in the code for printing property names.)
538    21. An orphan \E inside a character class could cause a crash.
540    22. A repeated capturing bracket such as (A)? could cause a wild memory
541        reference during compilation.
543    23. There are several functions in pcre_compile() that scan along a compiled
544        expression for various reasons (e.g. to see if it's fixed length for look
545        behind). There were bugs in these functions when a repeated \p or \P was
546        present in the pattern. These operators have additional parameters compared
547        with \d, etc, and these were not being taken into account when moving along
548        the compiled data. Specifically:
550        (a) A item such as \p{Yi}{3} in a lookbehind was not treated as fixed
551            length.
553        (b) An item such as \pL+ within a repeated group could cause crashes or
554            loops.
556        (c) A pattern such as \p{Yi}+(\P{Yi}+)(?1) could give an incorrect
557            "reference to non-existent subpattern" error.
559        (d) A pattern like (\P{Yi}{2}\277)? could loop at compile time.
561    24. A repeated \S or \W in UTF-8 mode could give wrong answers when multibyte
562        characters were involved (for example /\S{2}/8g with "A\x{a3}BC").
564    25. Using pcregrep in multiline, inverted mode (-Mv) caused it to loop.
566    26. Patterns such as [\P{Yi}A] which include \p or \P and just one other
567        character were causing crashes (broken optimization).
569    27. Patterns such as (\P{Yi}*\277)* (group with possible zero repeat containing
570        \p or \P) caused a compile-time loop.
572    28. More problems have arisen in unanchored patterns when CRLF is a valid line
573        break. For example, the unstudied pattern [\r\n]A does not match the string
574        "\r\nA" because change 7.0/46 below moves the current point on by two
575        characters after failing to match at the start. However, the pattern \nA
576        *does* match, because it doesn't start till \n, and if [\r\n]A is studied,
577        the same is true. There doesn't seem any very clean way out of this, but
578        what I have chosen to do makes the common cases work: PCRE now takes note
579        of whether there can be an explicit match for \r or \n anywhere in the
580        pattern, and if so, 7.0/46 no longer applies. As part of this change,
581        there's a new PCRE_INFO_HASCRORLF option for finding out whether a compiled
582        pattern has explicit CR or LF references.
584    29. Added (*CR) etc for changing newline setting at start of pattern.
587    Version 7.2 19-Jun-07
588    ---------------------
590     1. If the fr_FR locale cannot be found for test 3, try the "french" locale,
591        which is apparently normally available under Windows.
593     2. Re-jig the pcregrep tests with different newline settings in an attempt
594        to make them independent of the local environment's newline setting.
596     3. Add code to configure.ac to remove -g from the CFLAGS default settings.
598     4. Some of the "internals" tests were previously cut out when the link size
599        was not 2, because the output contained actual offsets. The recent new
600        "Z" feature of pcretest means that these can be cut out, making the tests
601        usable with all link sizes.
603     5. Implemented Stan Switzer's goto replacement for longjmp() when not using
604        stack recursion. This gives a massive performance boost under BSD, but just
605        a small improvement under Linux. However, it saves one field in the frame
606        in all cases.
608     6. Added more features from the forthcoming Perl 5.10:
610        (a) (?-n) (where n is a string of digits) is a relative subroutine or
611            recursion call. It refers to the nth most recently opened parentheses.
613        (b) (?+n) is also a relative subroutine call; it refers to the nth next
614            to be opened parentheses.
616        (c) Conditions that refer to capturing parentheses can be specified
617            relatively, for example, (?(-2)... or (?(+3)...
619        (d) \K resets the start of the current match so that everything before
620            is not part of it.
622        (e) \k{name} is synonymous with \k<name> and \k'name' (.NET compatible).
624        (f) \g{name} is another synonym - part of Perl 5.10's unification of
625            reference syntax.
627        (g) (?| introduces a group in which the numbering of parentheses in each
628            alternative starts with the same number.
630        (h) \h, \H, \v, and \V match horizontal and vertical whitespace.
632     7. Added two new calls to pcre_fullinfo(): PCRE_INFO_OKPARTIAL and
635     8. A pattern such as  (.*(.)?)*  caused pcre_exec() to fail by either not
636        terminating or by crashing. Diagnosed by Viktor Griph; it was in the code
637        for detecting groups that can match an empty string.
639     9. A pattern with a very large number of alternatives (more than several
640        hundred) was running out of internal workspace during the pre-compile
641        phase, where pcre_compile() figures out how much memory will be needed. A
642        bit of new cunning has reduced the workspace needed for groups with
643        alternatives. The 1000-alternative test pattern now uses 12 bytes of
644        workspace instead of running out of the 4096 that are available.
646    10. Inserted some missing (unsigned int) casts to get rid of compiler warnings.
648    11. Applied patch from Google to remove an optimization that didn't quite work.
649        The report of the bug said:
651          pcrecpp::RE("a*").FullMatch("aaa") matches, while
652          pcrecpp::RE("a*?").FullMatch("aaa") does not, and
653          pcrecpp::RE("a*?\\z").FullMatch("aaa") does again.
655    12. If \p or \P was used in non-UTF-8 mode on a character greater than 127
656        it matched the wrong number of bytes.
659    Version 7.1 24-Apr-07
660  ---------------------  ---------------------
662   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 136  Version 7.1 12-Mar-07 Line 791  Version 7.1 12-Mar-07
791      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
792      it specially.      it specially.
794    20. pcretest is supposed to handle patterns and data of any length, by
795        extending its buffers when necessary. It was getting this wrong when the
796        buffer for a data line had to be extended.
798    21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or
799        CRLF as a newline sequence.
801    22. Code for handling Unicode properties in pcre_dfa_exec() wasn't being cut
802        out by #ifdef SUPPORT_UCP. This did no harm, as it could never be used, but
803        I have nevertheless tidied it up.
805    23. Added some casts to kill warnings from HP-UX ia64 compiler.
807    24. Added a man page for pcre-config.
810  Version 7.0 19-Dec-06  Version 7.0 19-Dec-06
811  ---------------------  ---------------------

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