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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 7.1 12-Mar-07  Version 7.9 xx-xxx-09
5    ---------------------
7    1.  When building with support for bzlib/zlib (pcregrep) and/or readline
8        (pcretest), all targets were linked against these libraries. This included
9        libpcre, libpcreposix, and libpcrecpp, even though they do not use these
10        libraries. This caused unwanted dependencies to be created. This problem
11        has been fixed, and now only pcregrep is linked with bzlib/zlib and only
12        pcretest is linked with readline.
14    2.  The "typedef int BOOL" in pcre_internal.h that was included inside the
15        "#ifndef FALSE" condition by an earlier change (probably 7.8/18) has been
16        moved outside it again, because FALSE and TRUE are already defined in AIX,
17        but BOOL is not.
19    3.  The pcre_config() function was treating the PCRE_MATCH_LIMIT and
20        PCRE_MATCH_LIMIT_RETURSION values as ints, when they should be long ints.
22    4.  The pcregrep documentation said spaces were inserted as well as colons (or
23        hyphens) following file names and line numbers when outputting matching
24        lines. This is not true; no spaces are inserted. I have also clarified the
25        wording for the --colour (or --color) option.
27    5.  In pcregrep, when --colour was used with -o, the list of matching strings
28        was not coloured; this is different to GNU grep, so I have changed it to be
29        the same.
31    6.  When --colo(u)r was used in pcregrep, only the first matching substring in
32        each matching line was coloured. Now it goes on to look for further matches
33        of any of the test patterns, which is the same behaviour as GNU grep.
35    7.  A pattern that could match an empty string could cause pcregrep to loop; it
36        doesn't make sense to accept an empty string match in pcregrep, so I have
37        locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
38        seems to be how GNU grep behaves.
40    8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
41        start or after a newline", because the conditional assertion was not being
42        correctly handled. The rule now is that both the assertion and what follows
43        in the first alternative must satisfy the test.
45    9.  If auto-callout was enabled in a pattern with a conditional group, PCRE
46        could crash during matching.
48    10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
49        used for matching.
51    11. Unicode property support in character classes was not working for
52        characters (bytes) greater than 127 when not in UTF-8 mode.
54    12. Added the -M command line option to pcretest.
56    14. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
58    15. Added the PCRE_NO_START_OPTIMIZE match-time option.
60    16. Added comments and documentation about mis-use of no_arg in the C++
61        wrapper.
64    Version 7.8 05-Sep-08
65    ---------------------
67    1.  Replaced UCP searching code with optimized version as implemented for Ad
68        Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
69        stage table and inline lookup instead of a function, giving speed ups of 2
70        to 5 times on some simple patterns that I tested. Permission was given to
71        distribute the MultiStage2.py script that generates the tables (it's not in
72        the tarball, but is in the Subversion repository).
74    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
75        scripts.
77    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
78        a group with a zero qualifier. The result of the study could be incorrect,
79        or the function might crash, depending on the pattern.
81    4.  Caseless matching was not working for non-ASCII characters in back
82        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
83        It now works when Unicode Property Support is available.
85    5.  In pcretest, an escape such as \x{de} in the data was always generating
86        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
87        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
88        truncation.
90    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
92    7.  Added two (int) casts to pcregrep when printing the difference of two
93        pointers, in case they are 64-bit values.
95    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
96        test 2 if it fails.
98    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
99        and a #define of that name to empty if it is not externally set. This is to
100        allow users of MSVC to set it if necessary.
102    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
103        the convenience functions in the pcre_get.c source file.
105    11. An option change at the start of a pattern that had top-level alternatives
106        could cause overwriting and/or a crash. This command provoked a crash in
107        some environments:
109          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
111        This potential security problem was recorded as CVE-2008-2371.
113    12. For a pattern where the match had to start at the beginning or immediately
114        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
115        pcre_dfa_exec() could read past the end of the passed subject if there was
116        no match. To help with detecting such bugs (e.g. with valgrind), I modified
117        pcretest so that it places the subject at the end of its malloc-ed buffer.
119    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
120        exec() might read past the end of the data buffer in UTF-8 mode.
122    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
123        the data contained the byte 0x85 as part of a UTF-8 character within its
124        first line. This applied both to normal and DFA matching.
126    15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
127        /^[^d]*?$/8 failed to match "abc".
129    16. Added a missing copyright notice to pcrecpp_internal.h.
131    17. Make it more clear in the documentation that values returned from
132        pcre_exec() in ovector are byte offsets, not character counts.
134    18. Tidied a few places to stop certain compilers from issuing warnings.
136    19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
137        supplied by Stefan Weber. I made a further small update for 7.8 because
138        there is a change of source arrangements: the pcre_searchfuncs.c module is
139        replaced by pcre_ucd.c.
142    Version 7.7 07-May-08
143    ---------------------
145    1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
146        a string to a long long, pretend we don't even have a long long." This is
147        done by checking for the strtoq, strtoll, and _strtoi64 functions.
149    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
150        pre-7.6 versions, which defined a global no_arg variable instead of putting
151        it in the RE class. (See also #8 below.)
153    3.  Remove a line of dead code, identified by coverity and reported by Nuno
154        Lopes.
156    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
158        (1) The include/exclude patterns were being applied to the whole pathnames
159            of files, instead of just to the final components.
161        (2) If there was more than one level of directory, the subdirectories were
162            skipped unless they satisfied the include/exclude conditions. This is
163            inconsistent with GNU grep (and could even be seen as contrary to the
164            pcregrep specification - which I improved to make it absolutely clear).
165            The action now is always to scan all levels of directory, and just
166            apply the include/exclude patterns to regular files.
168    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
169        --exclude_dir in the tests to avoid scanning .svn directories.
171    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
172        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
173        doesn't support NULs in patterns.
175    7.  Added some missing "const"s to declarations of static tables in
176        pcre_compile.c and pcre_dfa_exec.c.
178    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
179        caused by fix #2  above. (Subsequently also a second patch to fix the
180        first patch. And a third patch - this was a messy problem.)
182    9.  Applied Craig's patch to remove the use of push_back().
184    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
185        matching function regexec().
187    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
188        which, however, unlike Perl's \g{...}, are subroutine calls, not back
189        references. PCRE supports relative numbers with this syntax (I don't think
190        Oniguruma does).
192    12. Previously, a group with a zero repeat such as (...){0} was completely
193        omitted from the compiled regex. However, this means that if the group
194        was called as a subroutine from elsewhere in the pattern, things went wrong
195        (an internal error was given). Such groups are now left in the compiled
196        pattern, with a new opcode that causes them to be skipped at execution
197        time.
199    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
200        to the way PCRE behaves:
202        (a) A lone ] character is dis-allowed (Perl treats it as data).
204        (b) A back reference to an unmatched subpattern matches an empty string
205            (Perl fails the current match path).
207        (c) A data ] in a character class must be notated as \] because if the
208            first data character in a class is ], it defines an empty class. (In
209            Perl it is not possible to have an empty class.) The empty class []
210            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
211            The negative empty class [^] matches any one character, independently
212            of the DOTALL setting.
214    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
215        non-existent subpattern following a character class starting with ']' and
216        containing () gave an internal compiling error instead of "reference to
217        non-existent subpattern". Fortunately, when the pattern did exist, the
218        compiled code was correct. (When scanning forwards to check for the
219        existencd of the subpattern, it was treating the data ']' as terminating
220        the class, so got the count wrong. When actually compiling, the reference
221        was subsequently set up correctly.)
223    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
224        it was being rejected as not supported by pcre_dfa_exec(), even though
225        other assertions are supported. I have made pcre_dfa_exec() support
226        (*FAIL).
228    16. The implementation of 13c above involved the invention of a new opcode,
229        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
230        cannot be changed at match time, I realized I could make a small
231        improvement to matching performance by compiling OP_ALLANY instead of
232        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
233        on the OP_ANY path.
235    17. Compiling pcretest on Windows with readline support failed without the
236        following two fixes: (1) Make the unistd.h include conditional on
237        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
239    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
240        ncurses library to be included for pcretest when ReadLine support is
241        requested, but also to allow for it to be overridden. This patch came from
242        Daniel Bergström.
244    19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
245        as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
246        any errors with the current Unicode tables. Thanks to Peter Kankowski for
247        spotting this.
250    Version 7.6 28-Jan-08
251    ---------------------
253    1.  A character class containing a very large number of characters with
254        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
255        overflow.
257    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
258        HAVE_LONG_LONG is not defined.
260    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
261        bring them up to date and include new features. This patch includes:
263        - Fixed PH's badly added libz and libbz2 support.
264        - Fixed a problem with static linking.
265        - Added pcredemo. [But later removed - see 7 below.]
266        - Fixed dftables problem and added an option.
267        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
268            HAVE_LONG_LONG.
269        - Added readline support for pcretest.
270        - Added an listing of the option settings after cmake has run.
272    4.  A user submitted a patch to Makefile that makes it easy to create
273        "pcre.dll" under mingw when using Configure/Make. I added stuff to
274        Makefile.am that cause it to include this special target, without
275        affecting anything else. Note that the same mingw target plus all
276        the other distribution libraries and programs are now supported
277        when configuring with CMake (see 6 below) instead of with
278        Configure/Make.
280    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
281        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
282        exported in the Windows port". It has not yet been confirmed that the patch
283        solves the problem, but it does no harm.
285    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
286        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
287        with CMake, and also correct the comment about stack recursion.
289    7.  Remove the automatic building of pcredemo from the ./configure system and
290        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
291        of a program that users should build themselves after PCRE is installed, so
292        building it automatically is not really right. What is more, it gave
293        trouble in some build environments.
295    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
298    Version 7.5 10-Jan-08
299    ---------------------
301    1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'
302        values in parens when parsing an RE using the C++ wrapper."
304    2.  Negative specials like \S did not work in character classes in UTF-8 mode.
305        Characters greater than 255 were excluded from the class instead of being
306        included.
308    3.  The same bug as (2) above applied to negated POSIX classes such as
309        [:^space:].
311    4.  PCRECPP_STATIC was referenced in pcrecpp_internal.h, but nowhere was it
312        defined or documented. It seems to have been a typo for PCRE_STATIC, so
313        I have changed it.
315    5.  The construct (?&) was not diagnosed as a syntax error (it referenced the
316        first named subpattern) and a construct such as (?&a) would reference the
317        first named subpattern whose name started with "a" (in other words, the
318        length check was missing). Both these problems are fixed. "Subpattern name
319        expected" is now given for (?&) (a zero-length name), and this patch also
320        makes it give the same error for \k'' (previously it complained that that
321        was a reference to a non-existent subpattern).
323    6.  The erroneous patterns (?+-a) and (?-+a) give different error messages;
324        this is right because (?- can be followed by option settings as well as by
325        digits. I have, however, made the messages clearer.
327    7.  Patterns such as (?(1)a|b) (a pattern that contains fewer subpatterns
328        than the number used in the conditional) now cause a compile-time error.
329        This is actually not compatible with Perl, which accepts such patterns, but
330        treats the conditional as always being FALSE (as PCRE used to), but it
331        seems to me that giving a diagnostic is better.
333    8.  Change "alphameric" to the more common word "alphanumeric" in comments
334        and messages.
336    9.  Fix two occurrences of "backslash" in comments that should have been
337        "backspace".
339    10. Remove two redundant lines of code that can never be obeyed (their function
340        was moved elsewhere).
342    11. The program that makes PCRE's Unicode character property table had a bug
343        which caused it to generate incorrect table entries for sequences of
344        characters that have the same character type, but are in different scripts.
345        It amalgamated them into a single range, with the script of the first of
346        them. In other words, some characters were in the wrong script. There were
347        thirteen such cases, affecting characters in the following ranges:
349          U+002b0 - U+002c1
350          U+0060c - U+0060d
351          U+0061e - U+00612
352          U+0064b - U+0065e
353          U+0074d - U+0076d
354          U+01800 - U+01805
355          U+01d00 - U+01d77
356          U+01d9b - U+01dbf
357          U+0200b - U+0200f
358          U+030fc - U+030fe
359          U+03260 - U+0327f
360          U+0fb46 - U+0fbb1
361          U+10450 - U+1049d
363    12. The -o option (show only the matching part of a line) for pcregrep was not
364        compatible with GNU grep in that, if there was more than one match in a
365        line, it showed only the first of them. It now behaves in the same way as
366        GNU grep.
368    13. If the -o and -v options were combined for pcregrep, it printed a blank
369        line for every non-matching line. GNU grep prints nothing, and pcregrep now
370        does the same. The return code can be used to tell if there were any
371        non-matching lines.
373    14. Added --file-offsets and --line-offsets to pcregrep.
375    15. The pattern (?=something)(?R) was not being diagnosed as a potentially
376        infinitely looping recursion. The bug was that positive lookaheads were not
377        being skipped when checking for a possible empty match (negative lookaheads
378        and both kinds of lookbehind were skipped).
380    16. Fixed two typos in the Windows-only code in pcregrep.c, and moved the
381        inclusion of <windows.h> to before rather than after the definition of
382        INVALID_FILE_ATTRIBUTES (patch from David Byron).
384    17. Specifying a possessive quantifier with a specific limit for a Unicode
385        character property caused pcre_compile() to compile bad code, which led at
386        runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this
387        are: /\p{Zl}{2,3}+/8 and /\p{Cc}{2}+/8. It was the possessive "+" that
388        caused the error; without that there was no problem.
390    18. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.
392    19. Added --enable-pcretest-libreadline.
394    20. In pcrecpp.cc, the variable 'count' was incremented twice in
395        RE::GlobalReplace(). As a result, the number of replacements returned was
396        double what it should be. I removed one of the increments, but Craig sent a
397        later patch that removed the other one (the right fix) and added unit tests
398        that check the return values (which was not done before).
400    21. Several CMake things:
402        (1) Arranged that, when cmake is used on Unix, the libraries end up with
403            the names libpcre and libpcreposix, not just pcre and pcreposix.
405        (2) The above change means that pcretest and pcregrep are now correctly
406            linked with the newly-built libraries, not previously installed ones.
410    22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
411        crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
412        UTF-8 newline character). The key issue is that the pattern starts .*;
413        this means that the match must be either at the beginning, or after a
414        newline. The bug was in the code for advancing after a failed match and
415        checking that the new position followed a newline. It was not taking
416        account of UTF-8 characters correctly.
418    23. PCRE was behaving differently from Perl in the way it recognized POSIX
419        character classes. PCRE was not treating the sequence [:...:] as a
420        character class unless the ... were all letters. Perl, however, seems to
421        allow any characters between [: and :], though of course it rejects as
422        unknown any "names" that contain non-letters, because all the known class
423        names consist only of letters. Thus, Perl gives an error for [[:1234:]],
424        for example, whereas PCRE did not - it did not recognize a POSIX character
425        class. This seemed a bit dangerous, so the code has been changed to be
426        closer to Perl. The behaviour is not identical to Perl, because PCRE will
427        diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
428        treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
429        Perl does, and where it didn't before.
431    24. Rewrite so as to remove the single use of %n from pcregrep because in some
432        Windows environments %n is disabled by default.
435    Version 7.4 21-Sep-07
436    ---------------------
438    1.  Change 7.3/28 was implemented for classes by looking at the bitmap. This
439        means that a class such as [\s] counted as "explicit reference to CR or
440        LF". That isn't really right - the whole point of the change was to try to
441        help when there was an actual mention of one of the two characters. So now
442        the change happens only if \r or \n (or a literal CR or LF) character is
443        encountered.
445    2.  The 32-bit options word was also used for 6 internal flags, but the numbers
446        of both had grown to the point where there were only 3 bits left.
447        Fortunately, there was spare space in the data structure, and so I have
448        moved the internal flags into a new 16-bit field to free up more option
449        bits.
451    3.  The appearance of (?J) at the start of a pattern set the DUPNAMES option,
452        but did not set the internal JCHANGED flag - either of these is enough to
453        control the way the "get" function works - but the PCRE_INFO_JCHANGED
454        facility is supposed to tell if (?J) was ever used, so now (?J) at the
455        start sets both bits.
457    4.  Added options (at build time, compile time, exec time) to change \R from
458        matching any Unicode line ending sequence to just matching CR, LF, or CRLF.
460    5.  doc/pcresyntax.html was missing from the distribution.
462    6.  Put back the definition of PCRE_ERROR_NULLWSLIMIT, for backward
463        compatibility, even though it is no longer used.
465    7.  Added macro for snprintf to pcrecpp_unittest.cc and also for strtoll and
466        strtoull to pcrecpp.cc to select the available functions in WIN32 when the
467        windows.h file is present (where different names are used). [This was
468        reversed later after testing - see 16 below.]
470    8.  Changed all #include <config.h> to #include "config.h". There were also
471        some further <pcre.h> cases that I changed to "pcre.h".
473    9.  When pcregrep was used with the --colour option, it missed the line ending
474        sequence off the lines that it output.
476    10. It was pointed out to me that arrays of string pointers cause lots of
477        relocations when a shared library is dynamically loaded. A technique of
478        using a single long string with a table of offsets can drastically reduce
479        these. I have refactored PCRE in four places to do this. The result is
480        dramatic:
482          Originally:                          290
483          After changing UCP table:            187
484          After changing error message table:   43
485          After changing table of "verbs"       36
486          After changing table of Posix names   22
488        Thanks to the folks working on Gregex for glib for this insight.
490    11. --disable-stack-for-recursion caused compiling to fail unless -enable-
491        unicode-properties was also set.
493    12. Updated the tests so that they work when \R is defaulted to ANYCRLF.
495    13. Added checks for ANY and ANYCRLF to pcrecpp.cc where it previously
496        checked only for CRLF.
498    14. Added casts to pcretest.c to avoid compiler warnings.
500    15. Added Craig's patch to various pcrecpp modules to avoid compiler warnings.
502    16. Added Craig's patch to remove the WINDOWS_H tests, that were not working,
503        and instead check for _strtoi64 explicitly, and avoid the use of snprintf()
504        entirely. This removes changes made in 7 above.
506    17. The CMake files have been updated, and there is now more information about
507        building with CMake in the NON-UNIX-USE document.
510    Version 7.3 28-Aug-07
511    ---------------------
513     1. In the rejigging of the build system that eventually resulted in 7.1, the
514        line "#include <pcre.h>" was included in pcre_internal.h. The use of angle
515        brackets there is not right, since it causes compilers to look for an
516        installed pcre.h, not the version that is in the source that is being
517        compiled (which of course may be different). I have changed it back to:
519          #include "pcre.h"
521        I have a vague recollection that the change was concerned with compiling in
522        different directories, but in the new build system, that is taken care of
523        by the VPATH setting the Makefile.
525     2. The pattern .*$ when run in not-DOTALL UTF-8 mode with newline=any failed
526        when the subject happened to end in the byte 0x85 (e.g. if the last
527        character was \x{1ec5}). *Character* 0x85 is one of the "any" newline
528        characters but of course it shouldn't be taken as a newline when it is part
529        of another character. The bug was that, for an unlimited repeat of . in
530        not-DOTALL UTF-8 mode, PCRE was advancing by bytes rather than by
531        characters when looking for a newline.
533     3. A small performance improvement in the DOTALL UTF-8 mode .* case.
535     4. Debugging: adjusted the names of opcodes for different kinds of parentheses
536        in debug output.
538     5. Arrange to use "%I64d" instead of "%lld" and "%I64u" instead of "%llu" for
539        long printing in the pcrecpp unittest when running under MinGW.
541     6. ESC_K was left out of the EBCDIC table.
543     7. Change 7.0/38 introduced a new limit on the number of nested non-capturing
544        parentheses; I made it 1000, which seemed large enough. Unfortunately, the
545        limit also applies to "virtual nesting" when a pattern is recursive, and in
546        this case 1000 isn't so big. I have been able to remove this limit at the
547        expense of backing off one optimization in certain circumstances. Normally,
548        when pcre_exec() would call its internal match() function recursively and
549        immediately return the result unconditionally, it uses a "tail recursion"
550        feature to save stack. However, when a subpattern that can match an empty
551        string has an unlimited repetition quantifier, it no longer makes this
552        optimization. That gives it a stack frame in which to save the data for
553        checking that an empty string has been matched. Previously this was taken
554        from the 1000-entry workspace that had been reserved. So now there is no
555        explicit limit, but more stack is used.
557     8. Applied Daniel's patches to solve problems with the import/export magic
558        syntax that is required for Windows, and which was going wrong for the
559        pcreposix and pcrecpp parts of the library. These were overlooked when this
560        problem was solved for the main library.
562     9. There were some crude static tests to avoid integer overflow when computing
563        the size of patterns that contain repeated groups with explicit upper
564        limits. As the maximum quantifier is 65535, the maximum group length was
565        set at 30,000 so that the product of these two numbers did not overflow a
566        32-bit integer. However, it turns out that people want to use groups that
567        are longer than 30,000 bytes (though not repeat them that many times).
568        Change 7.0/17 (the refactoring of the way the pattern size is computed) has
569        made it possible to implement the integer overflow checks in a much more
570        dynamic way, which I have now done. The artificial limitation on group
571        length has been removed - we now have only the limit on the total length of
572        the compiled pattern, which depends on the LINK_SIZE setting.
574    10. Fixed a bug in the documentation for get/copy named substring when
575        duplicate names are permitted. If none of the named substrings are set, the
576        functions return PCRE_ERROR_NOSUBSTRING (7); the doc said they returned an
577        empty string.
579    11. Because Perl interprets \Q...\E at a high level, and ignores orphan \E
580        instances, patterns such as [\Q\E] or [\E] or even [^\E] cause an error,
581        because the ] is interpreted as the first data character and the
582        terminating ] is not found. PCRE has been made compatible with Perl in this
583        regard. Previously, it interpreted [\Q\E] as an empty class, and [\E] could
584        cause memory overwriting.
586    10. Like Perl, PCRE automatically breaks an unlimited repeat after an empty
587        string has been matched (to stop an infinite loop). It was not recognizing
588        a conditional subpattern that could match an empty string if that
589        subpattern was within another subpattern. For example, it looped when
590        trying to match  (((?(1)X|))*)  but it was OK with  ((?(1)X|)*)  where the
591        condition was not nested. This bug has been fixed.
593    12. A pattern like \X?\d or \P{L}?\d in non-UTF-8 mode could cause a backtrack
594        past the start of the subject in the presence of bytes with the top bit
595        set, for example "\x8aBCD".
597    13. Added Perl 5.10 experimental backtracking controls (*FAIL), (*F), (*PRUNE),
598        (*SKIP), (*THEN), (*COMMIT), and (*ACCEPT).
600    14. Optimized (?!) to (*FAIL).
602    15. Updated the test for a valid UTF-8 string to conform to the later RFC 3629.
603        This restricts code points to be within the range 0 to 0x10FFFF, excluding
604        the "low surrogate" sequence 0xD800 to 0xDFFF. Previously, PCRE allowed the
605        full range 0 to 0x7FFFFFFF, as defined by RFC 2279. Internally, it still
606        does: it's just the validity check that is more restrictive.
608    16. Inserted checks for integer overflows during escape sequence (backslash)
609        processing, and also fixed erroneous offset values for syntax errors during
610        backslash processing.
612    17. Fixed another case of looking too far back in non-UTF-8 mode (cf 12 above)
613        for patterns like [\PPP\x8a]{1,}\x80 with the subject "A\x80".
615    18. An unterminated class in a pattern like (?1)\c[ with a "forward reference"
616        caused an overrun.
618    19. A pattern like (?:[\PPa*]*){8,} which had an "extended class" (one with
619        something other than just ASCII characters) inside a group that had an
620        unlimited repeat caused a loop at compile time (while checking to see
621        whether the group could match an empty string).
623    20. Debugging a pattern containing \p or \P could cause a crash. For example,
624        [\P{Any}] did so. (Error in the code for printing property names.)
626    21. An orphan \E inside a character class could cause a crash.
628    22. A repeated capturing bracket such as (A)? could cause a wild memory
629        reference during compilation.
631    23. There are several functions in pcre_compile() that scan along a compiled
632        expression for various reasons (e.g. to see if it's fixed length for look
633        behind). There were bugs in these functions when a repeated \p or \P was
634        present in the pattern. These operators have additional parameters compared
635        with \d, etc, and these were not being taken into account when moving along
636        the compiled data. Specifically:
638        (a) A item such as \p{Yi}{3} in a lookbehind was not treated as fixed
639            length.
641        (b) An item such as \pL+ within a repeated group could cause crashes or
642            loops.
644        (c) A pattern such as \p{Yi}+(\P{Yi}+)(?1) could give an incorrect
645            "reference to non-existent subpattern" error.
647        (d) A pattern like (\P{Yi}{2}\277)? could loop at compile time.
649    24. A repeated \S or \W in UTF-8 mode could give wrong answers when multibyte
650        characters were involved (for example /\S{2}/8g with "A\x{a3}BC").
652    25. Using pcregrep in multiline, inverted mode (-Mv) caused it to loop.
654    26. Patterns such as [\P{Yi}A] which include \p or \P and just one other
655        character were causing crashes (broken optimization).
657    27. Patterns such as (\P{Yi}*\277)* (group with possible zero repeat containing
658        \p or \P) caused a compile-time loop.
660    28. More problems have arisen in unanchored patterns when CRLF is a valid line
661        break. For example, the unstudied pattern [\r\n]A does not match the string
662        "\r\nA" because change 7.0/46 below moves the current point on by two
663        characters after failing to match at the start. However, the pattern \nA
664        *does* match, because it doesn't start till \n, and if [\r\n]A is studied,
665        the same is true. There doesn't seem any very clean way out of this, but
666        what I have chosen to do makes the common cases work: PCRE now takes note
667        of whether there can be an explicit match for \r or \n anywhere in the
668        pattern, and if so, 7.0/46 no longer applies. As part of this change,
669        there's a new PCRE_INFO_HASCRORLF option for finding out whether a compiled
670        pattern has explicit CR or LF references.
672    29. Added (*CR) etc for changing newline setting at start of pattern.
675    Version 7.2 19-Jun-07
676    ---------------------
678     1. If the fr_FR locale cannot be found for test 3, try the "french" locale,
679        which is apparently normally available under Windows.
681     2. Re-jig the pcregrep tests with different newline settings in an attempt
682        to make them independent of the local environment's newline setting.
684     3. Add code to configure.ac to remove -g from the CFLAGS default settings.
686     4. Some of the "internals" tests were previously cut out when the link size
687        was not 2, because the output contained actual offsets. The recent new
688        "Z" feature of pcretest means that these can be cut out, making the tests
689        usable with all link sizes.
691     5. Implemented Stan Switzer's goto replacement for longjmp() when not using
692        stack recursion. This gives a massive performance boost under BSD, but just
693        a small improvement under Linux. However, it saves one field in the frame
694        in all cases.
696     6. Added more features from the forthcoming Perl 5.10:
698        (a) (?-n) (where n is a string of digits) is a relative subroutine or
699            recursion call. It refers to the nth most recently opened parentheses.
701        (b) (?+n) is also a relative subroutine call; it refers to the nth next
702            to be opened parentheses.
704        (c) Conditions that refer to capturing parentheses can be specified
705            relatively, for example, (?(-2)... or (?(+3)...
707        (d) \K resets the start of the current match so that everything before
708            is not part of it.
710        (e) \k{name} is synonymous with \k<name> and \k'name' (.NET compatible).
712        (f) \g{name} is another synonym - part of Perl 5.10's unification of
713            reference syntax.
715        (g) (?| introduces a group in which the numbering of parentheses in each
716            alternative starts with the same number.
718        (h) \h, \H, \v, and \V match horizontal and vertical whitespace.
720     7. Added two new calls to pcre_fullinfo(): PCRE_INFO_OKPARTIAL and
723     8. A pattern such as  (.*(.)?)*  caused pcre_exec() to fail by either not
724        terminating or by crashing. Diagnosed by Viktor Griph; it was in the code
725        for detecting groups that can match an empty string.
727     9. A pattern with a very large number of alternatives (more than several
728        hundred) was running out of internal workspace during the pre-compile
729        phase, where pcre_compile() figures out how much memory will be needed. A
730        bit of new cunning has reduced the workspace needed for groups with
731        alternatives. The 1000-alternative test pattern now uses 12 bytes of
732        workspace instead of running out of the 4096 that are available.
734    10. Inserted some missing (unsigned int) casts to get rid of compiler warnings.
736    11. Applied patch from Google to remove an optimization that didn't quite work.
737        The report of the bug said:
739          pcrecpp::RE("a*").FullMatch("aaa") matches, while
740          pcrecpp::RE("a*?").FullMatch("aaa") does not, and
741          pcrecpp::RE("a*?\\z").FullMatch("aaa") does again.
743    12. If \p or \P was used in non-UTF-8 mode on a character greater than 127
744        it matched the wrong number of bytes.
747    Version 7.1 24-Apr-07
748  ---------------------  ---------------------
750   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 149  Version 7.1 12-Mar-07 Line 892  Version 7.1 12-Mar-07
893  23. Added some casts to kill warnings from HP-UX ia64 compiler.  23. Added some casts to kill warnings from HP-UX ia64 compiler.
895    24. Added a man page for pcre-config.
898  Version 7.0 19-Dec-06  Version 7.0 19-Dec-06
899  ---------------------  ---------------------

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