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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 7.1 05-Mar-07  Version 7.9 xx-xxx-09
5  ---------------------  ---------------------
7   1. Applied Bob Rossi and Daniel G's patches to convert the build system to one  1.  When building with support for bzlib/zlib (pcregrep) and/or readline
8      that is more "standard", making use of automake and other autotools. There      (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.
63    17. Implemented support for UTF-8 encoding in EBCDIC environments, a patch
64        from Martin Jerabek that uses macro names for all relevant character and
65        string constants.
67    18. Added to pcre_internal.h two configuration checks: (a) If both EBCDIC and
68        SUPPORT_UTF8 are set, give an error; (b) If SUPPORT_UCP is set without
69        SUPPORT_UTF8, define SUPPORT_UTF8. The "configure" script handles both of
70        these, but not everybody uses configure.
72    19. A conditional group that had only one branch was not being correctly
73        recognized as an item that could match an empty string. This meant that an
74        enclosing group might also not be so recognized, causing infinite looping
75        (and probably a segfault) for patterns such as ^"((?(?=[a])[^"])|b)*"$
76        with the subject "ab", where knowledge that the repeated group can match
77        nothing is needed in order to break the loop.
79    20. If a pattern that was compiled with callouts was matched using pcre_dfa_
80        exec(), but without supplying a callout function, matching went wrong.
83    Version 7.8 05-Sep-08
84    ---------------------
86    1.  Replaced UCP searching code with optimized version as implemented for Ad
87        Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
88        stage table and inline lookup instead of a function, giving speed ups of 2
89        to 5 times on some simple patterns that I tested. Permission was given to
90        distribute the MultiStage2.py script that generates the tables (it's not in
91        the tarball, but is in the Subversion repository).
93    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
94        scripts.
96    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
97        a group with a zero qualifier. The result of the study could be incorrect,
98        or the function might crash, depending on the pattern.
100    4.  Caseless matching was not working for non-ASCII characters in back
101        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
102        It now works when Unicode Property Support is available.
104    5.  In pcretest, an escape such as \x{de} in the data was always generating
105        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
106        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
107        truncation.
109    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
111    7.  Added two (int) casts to pcregrep when printing the difference of two
112        pointers, in case they are 64-bit values.
114    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
115        test 2 if it fails.
117    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
118        and a #define of that name to empty if it is not externally set. This is to
119        allow users of MSVC to set it if necessary.
121    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
122        the convenience functions in the pcre_get.c source file.
124    11. An option change at the start of a pattern that had top-level alternatives
125        could cause overwriting and/or a crash. This command provoked a crash in
126        some environments:
128          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
130        This potential security problem was recorded as CVE-2008-2371.
132    12. For a pattern where the match had to start at the beginning or immediately
133        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
134        pcre_dfa_exec() could read past the end of the passed subject if there was
135        no match. To help with detecting such bugs (e.g. with valgrind), I modified
136        pcretest so that it places the subject at the end of its malloc-ed buffer.
138    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
139        exec() might read past the end of the data buffer in UTF-8 mode.
141    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
142        the data contained the byte 0x85 as part of a UTF-8 character within its
143        first line. This applied both to normal and DFA matching.
145    15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
146        /^[^d]*?$/8 failed to match "abc".
148    16. Added a missing copyright notice to pcrecpp_internal.h.
150    17. Make it more clear in the documentation that values returned from
151        pcre_exec() in ovector are byte offsets, not character counts.
153    18. Tidied a few places to stop certain compilers from issuing warnings.
155    19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
156        supplied by Stefan Weber. I made a further small update for 7.8 because
157        there is a change of source arrangements: the pcre_searchfuncs.c module is
158        replaced by pcre_ucd.c.
161    Version 7.7 07-May-08
162    ---------------------
164    1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
165        a string to a long long, pretend we don't even have a long long." This is
166        done by checking for the strtoq, strtoll, and _strtoi64 functions.
168    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
169        pre-7.6 versions, which defined a global no_arg variable instead of putting
170        it in the RE class. (See also #8 below.)
172    3.  Remove a line of dead code, identified by coverity and reported by Nuno
173        Lopes.
175    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
177        (1) The include/exclude patterns were being applied to the whole pathnames
178            of files, instead of just to the final components.
180        (2) If there was more than one level of directory, the subdirectories were
181            skipped unless they satisfied the include/exclude conditions. This is
182            inconsistent with GNU grep (and could even be seen as contrary to the
183            pcregrep specification - which I improved to make it absolutely clear).
184            The action now is always to scan all levels of directory, and just
185            apply the include/exclude patterns to regular files.
187    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
188        --exclude_dir in the tests to avoid scanning .svn directories.
190    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
191        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
192        doesn't support NULs in patterns.
194    7.  Added some missing "const"s to declarations of static tables in
195        pcre_compile.c and pcre_dfa_exec.c.
197    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
198        caused by fix #2  above. (Subsequently also a second patch to fix the
199        first patch. And a third patch - this was a messy problem.)
201    9.  Applied Craig's patch to remove the use of push_back().
203    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
204        matching function regexec().
206    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
207        which, however, unlike Perl's \g{...}, are subroutine calls, not back
208        references. PCRE supports relative numbers with this syntax (I don't think
209        Oniguruma does).
211    12. Previously, a group with a zero repeat such as (...){0} was completely
212        omitted from the compiled regex. However, this means that if the group
213        was called as a subroutine from elsewhere in the pattern, things went wrong
214        (an internal error was given). Such groups are now left in the compiled
215        pattern, with a new opcode that causes them to be skipped at execution
216        time.
218    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
219        to the way PCRE behaves:
221        (a) A lone ] character is dis-allowed (Perl treats it as data).
223        (b) A back reference to an unmatched subpattern matches an empty string
224            (Perl fails the current match path).
226        (c) A data ] in a character class must be notated as \] because if the
227            first data character in a class is ], it defines an empty class. (In
228            Perl it is not possible to have an empty class.) The empty class []
229            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
230            The negative empty class [^] matches any one character, independently
231            of the DOTALL setting.
233    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
234        non-existent subpattern following a character class starting with ']' and
235        containing () gave an internal compiling error instead of "reference to
236        non-existent subpattern". Fortunately, when the pattern did exist, the
237        compiled code was correct. (When scanning forwards to check for the
238        existencd of the subpattern, it was treating the data ']' as terminating
239        the class, so got the count wrong. When actually compiling, the reference
240        was subsequently set up correctly.)
242    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
243        it was being rejected as not supported by pcre_dfa_exec(), even though
244        other assertions are supported. I have made pcre_dfa_exec() support
245        (*FAIL).
247    16. The implementation of 13c above involved the invention of a new opcode,
248        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
249        cannot be changed at match time, I realized I could make a small
250        improvement to matching performance by compiling OP_ALLANY instead of
251        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
252        on the OP_ANY path.
254    17. Compiling pcretest on Windows with readline support failed without the
255        following two fixes: (1) Make the unistd.h include conditional on
256        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
258    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
259        ncurses library to be included for pcretest when ReadLine support is
260        requested, but also to allow for it to be overridden. This patch came from
261        Daniel Bergström.
263    19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
264        as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
265        any errors with the current Unicode tables. Thanks to Peter Kankowski for
266        spotting this.
269    Version 7.6 28-Jan-08
270    ---------------------
272    1.  A character class containing a very large number of characters with
273        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
274        overflow.
276    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
277        HAVE_LONG_LONG is not defined.
279    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
280        bring them up to date and include new features. This patch includes:
282        - Fixed PH's badly added libz and libbz2 support.
283        - Fixed a problem with static linking.
284        - Added pcredemo. [But later removed - see 7 below.]
285        - Fixed dftables problem and added an option.
286        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
287            HAVE_LONG_LONG.
288        - Added readline support for pcretest.
289        - Added an listing of the option settings after cmake has run.
291    4.  A user submitted a patch to Makefile that makes it easy to create
292        "pcre.dll" under mingw when using Configure/Make. I added stuff to
293        Makefile.am that cause it to include this special target, without
294        affecting anything else. Note that the same mingw target plus all
295        the other distribution libraries and programs are now supported
296        when configuring with CMake (see 6 below) instead of with
297        Configure/Make.
299    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
300        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
301        exported in the Windows port". It has not yet been confirmed that the patch
302        solves the problem, but it does no harm.
304    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
305        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
306        with CMake, and also correct the comment about stack recursion.
308    7.  Remove the automatic building of pcredemo from the ./configure system and
309        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
310        of a program that users should build themselves after PCRE is installed, so
311        building it automatically is not really right. What is more, it gave
312        trouble in some build environments.
314    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
317    Version 7.5 10-Jan-08
318    ---------------------
320    1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'
321        values in parens when parsing an RE using the C++ wrapper."
323    2.  Negative specials like \S did not work in character classes in UTF-8 mode.
324        Characters greater than 255 were excluded from the class instead of being
325        included.
327    3.  The same bug as (2) above applied to negated POSIX classes such as
328        [:^space:].
330    4.  PCRECPP_STATIC was referenced in pcrecpp_internal.h, but nowhere was it
331        defined or documented. It seems to have been a typo for PCRE_STATIC, so
332        I have changed it.
334    5.  The construct (?&) was not diagnosed as a syntax error (it referenced the
335        first named subpattern) and a construct such as (?&a) would reference the
336        first named subpattern whose name started with "a" (in other words, the
337        length check was missing). Both these problems are fixed. "Subpattern name
338        expected" is now given for (?&) (a zero-length name), and this patch also
339        makes it give the same error for \k'' (previously it complained that that
340        was a reference to a non-existent subpattern).
342    6.  The erroneous patterns (?+-a) and (?-+a) give different error messages;
343        this is right because (?- can be followed by option settings as well as by
344        digits. I have, however, made the messages clearer.
346    7.  Patterns such as (?(1)a|b) (a pattern that contains fewer subpatterns
347        than the number used in the conditional) now cause a compile-time error.
348        This is actually not compatible with Perl, which accepts such patterns, but
349        treats the conditional as always being FALSE (as PCRE used to), but it
350        seems to me that giving a diagnostic is better.
352    8.  Change "alphameric" to the more common word "alphanumeric" in comments
353        and messages.
355    9.  Fix two occurrences of "backslash" in comments that should have been
356        "backspace".
358    10. Remove two redundant lines of code that can never be obeyed (their function
359        was moved elsewhere).
361    11. The program that makes PCRE's Unicode character property table had a bug
362        which caused it to generate incorrect table entries for sequences of
363        characters that have the same character type, but are in different scripts.
364        It amalgamated them into a single range, with the script of the first of
365        them. In other words, some characters were in the wrong script. There were
366        thirteen such cases, affecting characters in the following ranges:
368          U+002b0 - U+002c1
369          U+0060c - U+0060d
370          U+0061e - U+00612
371          U+0064b - U+0065e
372          U+0074d - U+0076d
373          U+01800 - U+01805
374          U+01d00 - U+01d77
375          U+01d9b - U+01dbf
376          U+0200b - U+0200f
377          U+030fc - U+030fe
378          U+03260 - U+0327f
379          U+0fb46 - U+0fbb1
380          U+10450 - U+1049d
382    12. The -o option (show only the matching part of a line) for pcregrep was not
383        compatible with GNU grep in that, if there was more than one match in a
384        line, it showed only the first of them. It now behaves in the same way as
385        GNU grep.
387    13. If the -o and -v options were combined for pcregrep, it printed a blank
388        line for every non-matching line. GNU grep prints nothing, and pcregrep now
389        does the same. The return code can be used to tell if there were any
390        non-matching lines.
392    14. Added --file-offsets and --line-offsets to pcregrep.
394    15. The pattern (?=something)(?R) was not being diagnosed as a potentially
395        infinitely looping recursion. The bug was that positive lookaheads were not
396        being skipped when checking for a possible empty match (negative lookaheads
397        and both kinds of lookbehind were skipped).
399    16. Fixed two typos in the Windows-only code in pcregrep.c, and moved the
400        inclusion of <windows.h> to before rather than after the definition of
401        INVALID_FILE_ATTRIBUTES (patch from David Byron).
403    17. Specifying a possessive quantifier with a specific limit for a Unicode
404        character property caused pcre_compile() to compile bad code, which led at
405        runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this
406        are: /\p{Zl}{2,3}+/8 and /\p{Cc}{2}+/8. It was the possessive "+" that
407        caused the error; without that there was no problem.
409    18. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.
411    19. Added --enable-pcretest-libreadline.
413    20. In pcrecpp.cc, the variable 'count' was incremented twice in
414        RE::GlobalReplace(). As a result, the number of replacements returned was
415        double what it should be. I removed one of the increments, but Craig sent a
416        later patch that removed the other one (the right fix) and added unit tests
417        that check the return values (which was not done before).
419    21. Several CMake things:
421        (1) Arranged that, when cmake is used on Unix, the libraries end up with
422            the names libpcre and libpcreposix, not just pcre and pcreposix.
424        (2) The above change means that pcretest and pcregrep are now correctly
425            linked with the newly-built libraries, not previously installed ones.
429    22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
430        crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
431        UTF-8 newline character). The key issue is that the pattern starts .*;
432        this means that the match must be either at the beginning, or after a
433        newline. The bug was in the code for advancing after a failed match and
434        checking that the new position followed a newline. It was not taking
435        account of UTF-8 characters correctly.
437    23. PCRE was behaving differently from Perl in the way it recognized POSIX
438        character classes. PCRE was not treating the sequence [:...:] as a
439        character class unless the ... were all letters. Perl, however, seems to
440        allow any characters between [: and :], though of course it rejects as
441        unknown any "names" that contain non-letters, because all the known class
442        names consist only of letters. Thus, Perl gives an error for [[:1234:]],
443        for example, whereas PCRE did not - it did not recognize a POSIX character
444        class. This seemed a bit dangerous, so the code has been changed to be
445        closer to Perl. The behaviour is not identical to Perl, because PCRE will
446        diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
447        treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
448        Perl does, and where it didn't before.
450    24. Rewrite so as to remove the single use of %n from pcregrep because in some
451        Windows environments %n is disabled by default.
454    Version 7.4 21-Sep-07
455    ---------------------
457    1.  Change 7.3/28 was implemented for classes by looking at the bitmap. This
458        means that a class such as [\s] counted as "explicit reference to CR or
459        LF". That isn't really right - the whole point of the change was to try to
460        help when there was an actual mention of one of the two characters. So now
461        the change happens only if \r or \n (or a literal CR or LF) character is
462        encountered.
464    2.  The 32-bit options word was also used for 6 internal flags, but the numbers
465        of both had grown to the point where there were only 3 bits left.
466        Fortunately, there was spare space in the data structure, and so I have
467        moved the internal flags into a new 16-bit field to free up more option
468        bits.
470    3.  The appearance of (?J) at the start of a pattern set the DUPNAMES option,
471        but did not set the internal JCHANGED flag - either of these is enough to
472        control the way the "get" function works - but the PCRE_INFO_JCHANGED
473        facility is supposed to tell if (?J) was ever used, so now (?J) at the
474        start sets both bits.
476    4.  Added options (at build time, compile time, exec time) to change \R from
477        matching any Unicode line ending sequence to just matching CR, LF, or CRLF.
479    5.  doc/pcresyntax.html was missing from the distribution.
481    6.  Put back the definition of PCRE_ERROR_NULLWSLIMIT, for backward
482        compatibility, even though it is no longer used.
484    7.  Added macro for snprintf to pcrecpp_unittest.cc and also for strtoll and
485        strtoull to pcrecpp.cc to select the available functions in WIN32 when the
486        windows.h file is present (where different names are used). [This was
487        reversed later after testing - see 16 below.]
489    8.  Changed all #include <config.h> to #include "config.h". There were also
490        some further <pcre.h> cases that I changed to "pcre.h".
492    9.  When pcregrep was used with the --colour option, it missed the line ending
493        sequence off the lines that it output.
495    10. It was pointed out to me that arrays of string pointers cause lots of
496        relocations when a shared library is dynamically loaded. A technique of
497        using a single long string with a table of offsets can drastically reduce
498        these. I have refactored PCRE in four places to do this. The result is
499        dramatic:
501          Originally:                          290
502          After changing UCP table:            187
503          After changing error message table:   43
504          After changing table of "verbs"       36
505          After changing table of Posix names   22
507        Thanks to the folks working on Gregex for glib for this insight.
509    11. --disable-stack-for-recursion caused compiling to fail unless -enable-
510        unicode-properties was also set.
512    12. Updated the tests so that they work when \R is defaulted to ANYCRLF.
514    13. Added checks for ANY and ANYCRLF to pcrecpp.cc where it previously
515        checked only for CRLF.
517    14. Added casts to pcretest.c to avoid compiler warnings.
519    15. Added Craig's patch to various pcrecpp modules to avoid compiler warnings.
521    16. Added Craig's patch to remove the WINDOWS_H tests, that were not working,
522        and instead check for _strtoi64 explicitly, and avoid the use of snprintf()
523        entirely. This removes changes made in 7 above.
525    17. The CMake files have been updated, and there is now more information about
526        building with CMake in the NON-UNIX-USE document.
529    Version 7.3 28-Aug-07
530    ---------------------
532     1. In the rejigging of the build system that eventually resulted in 7.1, the
533        line "#include <pcre.h>" was included in pcre_internal.h. The use of angle
534        brackets there is not right, since it causes compilers to look for an
535        installed pcre.h, not the version that is in the source that is being
536        compiled (which of course may be different). I have changed it back to:
538          #include "pcre.h"
540        I have a vague recollection that the change was concerned with compiling in
541        different directories, but in the new build system, that is taken care of
542        by the VPATH setting the Makefile.
544     2. The pattern .*$ when run in not-DOTALL UTF-8 mode with newline=any failed
545        when the subject happened to end in the byte 0x85 (e.g. if the last
546        character was \x{1ec5}). *Character* 0x85 is one of the "any" newline
547        characters but of course it shouldn't be taken as a newline when it is part
548        of another character. The bug was that, for an unlimited repeat of . in
549        not-DOTALL UTF-8 mode, PCRE was advancing by bytes rather than by
550        characters when looking for a newline.
552     3. A small performance improvement in the DOTALL UTF-8 mode .* case.
554     4. Debugging: adjusted the names of opcodes for different kinds of parentheses
555        in debug output.
557     5. Arrange to use "%I64d" instead of "%lld" and "%I64u" instead of "%llu" for
558        long printing in the pcrecpp unittest when running under MinGW.
560     6. ESC_K was left out of the EBCDIC table.
562     7. Change 7.0/38 introduced a new limit on the number of nested non-capturing
563        parentheses; I made it 1000, which seemed large enough. Unfortunately, the
564        limit also applies to "virtual nesting" when a pattern is recursive, and in
565        this case 1000 isn't so big. I have been able to remove this limit at the
566        expense of backing off one optimization in certain circumstances. Normally,
567        when pcre_exec() would call its internal match() function recursively and
568        immediately return the result unconditionally, it uses a "tail recursion"
569        feature to save stack. However, when a subpattern that can match an empty
570        string has an unlimited repetition quantifier, it no longer makes this
571        optimization. That gives it a stack frame in which to save the data for
572        checking that an empty string has been matched. Previously this was taken
573        from the 1000-entry workspace that had been reserved. So now there is no
574        explicit limit, but more stack is used.
576     8. Applied Daniel's patches to solve problems with the import/export magic
577        syntax that is required for Windows, and which was going wrong for the
578        pcreposix and pcrecpp parts of the library. These were overlooked when this
579        problem was solved for the main library.
581     9. There were some crude static tests to avoid integer overflow when computing
582        the size of patterns that contain repeated groups with explicit upper
583        limits. As the maximum quantifier is 65535, the maximum group length was
584        set at 30,000 so that the product of these two numbers did not overflow a
585        32-bit integer. However, it turns out that people want to use groups that
586        are longer than 30,000 bytes (though not repeat them that many times).
587        Change 7.0/17 (the refactoring of the way the pattern size is computed) has
588        made it possible to implement the integer overflow checks in a much more
589        dynamic way, which I have now done. The artificial limitation on group
590        length has been removed - we now have only the limit on the total length of
591        the compiled pattern, which depends on the LINK_SIZE setting.
593    10. Fixed a bug in the documentation for get/copy named substring when
594        duplicate names are permitted. If none of the named substrings are set, the
595        functions return PCRE_ERROR_NOSUBSTRING (7); the doc said they returned an
596        empty string.
598    11. Because Perl interprets \Q...\E at a high level, and ignores orphan \E
599        instances, patterns such as [\Q\E] or [\E] or even [^\E] cause an error,
600        because the ] is interpreted as the first data character and the
601        terminating ] is not found. PCRE has been made compatible with Perl in this
602        regard. Previously, it interpreted [\Q\E] as an empty class, and [\E] could
603        cause memory overwriting.
605    10. Like Perl, PCRE automatically breaks an unlimited repeat after an empty
606        string has been matched (to stop an infinite loop). It was not recognizing
607        a conditional subpattern that could match an empty string if that
608        subpattern was within another subpattern. For example, it looped when
609        trying to match  (((?(1)X|))*)  but it was OK with  ((?(1)X|)*)  where the
610        condition was not nested. This bug has been fixed.
612    12. A pattern like \X?\d or \P{L}?\d in non-UTF-8 mode could cause a backtrack
613        past the start of the subject in the presence of bytes with the top bit
614        set, for example "\x8aBCD".
616    13. Added Perl 5.10 experimental backtracking controls (*FAIL), (*F), (*PRUNE),
617        (*SKIP), (*THEN), (*COMMIT), and (*ACCEPT).
619    14. Optimized (?!) to (*FAIL).
621    15. Updated the test for a valid UTF-8 string to conform to the later RFC 3629.
622        This restricts code points to be within the range 0 to 0x10FFFF, excluding
623        the "low surrogate" sequence 0xD800 to 0xDFFF. Previously, PCRE allowed the
624        full range 0 to 0x7FFFFFFF, as defined by RFC 2279. Internally, it still
625        does: it's just the validity check that is more restrictive.
627    16. Inserted checks for integer overflows during escape sequence (backslash)
628        processing, and also fixed erroneous offset values for syntax errors during
629        backslash processing.
631    17. Fixed another case of looking too far back in non-UTF-8 mode (cf 12 above)
632        for patterns like [\PPP\x8a]{1,}\x80 with the subject "A\x80".
634    18. An unterminated class in a pattern like (?1)\c[ with a "forward reference"
635        caused an overrun.
637    19. A pattern like (?:[\PPa*]*){8,} which had an "extended class" (one with
638        something other than just ASCII characters) inside a group that had an
639        unlimited repeat caused a loop at compile time (while checking to see
640        whether the group could match an empty string).
642    20. Debugging a pattern containing \p or \P could cause a crash. For example,
643        [\P{Any}] did so. (Error in the code for printing property names.)
645    21. An orphan \E inside a character class could cause a crash.
647    22. A repeated capturing bracket such as (A)? could cause a wild memory
648        reference during compilation.
650    23. There are several functions in pcre_compile() that scan along a compiled
651        expression for various reasons (e.g. to see if it's fixed length for look
652        behind). There were bugs in these functions when a repeated \p or \P was
653        present in the pattern. These operators have additional parameters compared
654        with \d, etc, and these were not being taken into account when moving along
655        the compiled data. Specifically:
657        (a) A item such as \p{Yi}{3} in a lookbehind was not treated as fixed
658            length.
660        (b) An item such as \pL+ within a repeated group could cause crashes or
661            loops.
663        (c) A pattern such as \p{Yi}+(\P{Yi}+)(?1) could give an incorrect
664            "reference to non-existent subpattern" error.
666        (d) A pattern like (\P{Yi}{2}\277)? could loop at compile time.
668    24. A repeated \S or \W in UTF-8 mode could give wrong answers when multibyte
669        characters were involved (for example /\S{2}/8g with "A\x{a3}BC").
671    25. Using pcregrep in multiline, inverted mode (-Mv) caused it to loop.
673    26. Patterns such as [\P{Yi}A] which include \p or \P and just one other
674        character were causing crashes (broken optimization).
676    27. Patterns such as (\P{Yi}*\277)* (group with possible zero repeat containing
677        \p or \P) caused a compile-time loop.
679    28. More problems have arisen in unanchored patterns when CRLF is a valid line
680        break. For example, the unstudied pattern [\r\n]A does not match the string
681        "\r\nA" because change 7.0/46 below moves the current point on by two
682        characters after failing to match at the start. However, the pattern \nA
683        *does* match, because it doesn't start till \n, and if [\r\n]A is studied,
684        the same is true. There doesn't seem any very clean way out of this, but
685        what I have chosen to do makes the common cases work: PCRE now takes note
686        of whether there can be an explicit match for \r or \n anywhere in the
687        pattern, and if so, 7.0/46 no longer applies. As part of this change,
688        there's a new PCRE_INFO_HASCRORLF option for finding out whether a compiled
689        pattern has explicit CR or LF references.
691    29. Added (*CR) etc for changing newline setting at start of pattern.
694    Version 7.2 19-Jun-07
695    ---------------------
697     1. If the fr_FR locale cannot be found for test 3, try the "french" locale,
698        which is apparently normally available under Windows.
700     2. Re-jig the pcregrep tests with different newline settings in an attempt
701        to make them independent of the local environment's newline setting.
703     3. Add code to configure.ac to remove -g from the CFLAGS default settings.
705     4. Some of the "internals" tests were previously cut out when the link size
706        was not 2, because the output contained actual offsets. The recent new
707        "Z" feature of pcretest means that these can be cut out, making the tests
708        usable with all link sizes.
710     5. Implemented Stan Switzer's goto replacement for longjmp() when not using
711        stack recursion. This gives a massive performance boost under BSD, but just
712        a small improvement under Linux. However, it saves one field in the frame
713        in all cases.
715     6. Added more features from the forthcoming Perl 5.10:
717        (a) (?-n) (where n is a string of digits) is a relative subroutine or
718            recursion call. It refers to the nth most recently opened parentheses.
720        (b) (?+n) is also a relative subroutine call; it refers to the nth next
721            to be opened parentheses.
723        (c) Conditions that refer to capturing parentheses can be specified
724            relatively, for example, (?(-2)... or (?(+3)...
726        (d) \K resets the start of the current match so that everything before
727            is not part of it.
729        (e) \k{name} is synonymous with \k<name> and \k'name' (.NET compatible).
731        (f) \g{name} is another synonym - part of Perl 5.10's unification of
732            reference syntax.
734        (g) (?| introduces a group in which the numbering of parentheses in each
735            alternative starts with the same number.
737        (h) \h, \H, \v, and \V match horizontal and vertical whitespace.
739     7. Added two new calls to pcre_fullinfo(): PCRE_INFO_OKPARTIAL and
742     8. A pattern such as  (.*(.)?)*  caused pcre_exec() to fail by either not
743        terminating or by crashing. Diagnosed by Viktor Griph; it was in the code
744        for detecting groups that can match an empty string.
746     9. A pattern with a very large number of alternatives (more than several
747        hundred) was running out of internal workspace during the pre-compile
748        phase, where pcre_compile() figures out how much memory will be needed. A
749        bit of new cunning has reduced the workspace needed for groups with
750        alternatives. The 1000-alternative test pattern now uses 12 bytes of
751        workspace instead of running out of the 4096 that are available.
753    10. Inserted some missing (unsigned int) casts to get rid of compiler warnings.
755    11. Applied patch from Google to remove an optimization that didn't quite work.
756        The report of the bug said:
758          pcrecpp::RE("a*").FullMatch("aaa") matches, while
759          pcrecpp::RE("a*?").FullMatch("aaa") does not, and
760          pcrecpp::RE("a*?\\z").FullMatch("aaa") does again.
762    12. If \p or \P was used in non-UTF-8 mode on a character greater than 127
763        it matched the wrong number of bytes.
766    Version 7.1 24-Apr-07
767    ---------------------
769     1. Applied Bob Rossi and Daniel G's patches to convert the build system to one
770        that is more "standard", making use of automake and other Autotools. There
771      is some re-arrangement of the files and adjustment of comments consequent      is some re-arrangement of the files and adjustment of comments consequent
772      on this.      on this.
774   2. Part of the patch fixed a problem with the pcregrep tests. The test of -r   2. Part of the patch fixed a problem with the pcregrep tests. The test of -r
775      for recursive directory scanning broke on some systems because the files      for recursive directory scanning broke on some systems because the files
776      are not scanned in any specific order and on different systems the order      are not scanned in any specific order and on different systems the order
777      was different. A call to "sort" has been inserted into RunGrepTest for the      was different. A call to "sort" has been inserted into RunGrepTest for the
778      approprate test as a short-term fix. In the longer term there may be an      approprate test as a short-term fix. In the longer term there may be an
779      alternative.      alternative.
781   3. I had an email from Eric Raymond about problems translating some of PCRE's   3. I had an email from Eric Raymond about problems translating some of PCRE's
782      man pages to HTML (despite the fact that I distribute HTML pages, some      man pages to HTML (despite the fact that I distribute HTML pages, some
783      people do their own conversions for various reasons). The problems      people do their own conversions for various reasons). The problems
784      concerned the use of low-level troff macros .br and .in. I have therefore      concerned the use of low-level troff macros .br and .in. I have therefore
785      removed all such uses from the man pages (some were redundant, some could      removed all such uses from the man pages (some were redundant, some could
786      be replaced by .nf/.fi pairs). The maintain/132html script that I use to      be replaced by .nf/.fi pairs). The 132html script that I use to generate
787      generate HTML has been updated to handle .nf/.fi and to complain if it      HTML has been updated to handle .nf/.fi and to complain if it encounters
788      encounters .br or .in.      .br or .in.
790   4. Updated comments in configure.ac that get placed in config.h.in and also   4. Updated comments in configure.ac that get placed in config.h.in and also
791      arranged for config.h to be included in the distribution, for the benefit      arranged for config.h to be included in the distribution, with the name
792      of those who have to compile without Autotools (compare pcre.h).      config.h.generic, for the benefit of those who have to compile without
793        Autotools (compare pcre.h, which is now distributed as pcre.h.generic).
794   5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan  
795      Weber: (1) pcre_internal.h was missing some function renames; (2) updated   5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan
796      makevp.bat for the current PCRE, using the additional files !compile.txt,      Weber: (1) pcre_internal.h was missing some function renames; (2) updated
797      !linklib.txt, and pcregexp.pas.      makevp.bat for the current PCRE, using the additional files
798        makevp_c.txt, makevp_l.txt, and pcregexp.pas.
799   6. A Windows user reported a minor discrepancy with test 2, which turned out  
800      to be caused by a trailing space on an input line that had got lost in his   6. A Windows user reported a minor discrepancy with test 2, which turned out
801        to be caused by a trailing space on an input line that had got lost in his
802      copy. The trailing space was an accident, so I've just removed it.      copy. The trailing space was an accident, so I've just removed it.
804     7. Add -Wl,-R... flags in pcre-config.in for *BSD* systems, as I'm told
805        that is needed.
807     8. Mark ucp_table (in ucptable.h) and ucp_gentype (in pcre_ucp_searchfuncs.c)
808        as "const" (a) because they are and (b) because it helps the PHP
809        maintainers who have recently made a script to detect big data structures
810        in the php code that should be moved to the .rodata section. I remembered
811        to update Builducptable as well, so it won't revert if ucptable.h is ever
812        re-created.
814     9. Added some extra #ifdef SUPPORT_UTF8 conditionals into pcretest.c,
815        pcre_printint.src, pcre_compile.c, pcre_study.c, and pcre_tables.c, in
816        order to be able to cut out the UTF-8 tables in the latter when UTF-8
817        support is not required. This saves 1.5-2K of code, which is important in
818        some applications.
820        Later: more #ifdefs are needed in pcre_ord2utf8.c and pcre_valid_utf8.c
821        so as not to refer to the tables, even though these functions will never be
822        called when UTF-8 support is disabled. Otherwise there are problems with a
823        shared library.
825    10. Fixed two bugs in the emulated memmove() function in pcre_internal.h:
827        (a) It was defining its arguments as char * instead of void *.
829        (b) It was assuming that all moves were upwards in memory; this was true
830            a long time ago when I wrote it, but is no longer the case.
832        The emulated memove() is provided for those environments that have neither
833        memmove() nor bcopy(). I didn't think anyone used it these days, but that
834        is clearly not the case, as these two bugs were recently reported.
836    11. The script PrepareRelease is now distributed: it calls 132html, CleanTxt,
837        and Detrail to create the HTML documentation, the .txt form of the man
838        pages, and it removes trailing spaces from listed files. It also creates
839        pcre.h.generic and config.h.generic from pcre.h and config.h. In the latter
840        case, it wraps all the #defines with #ifndefs. This script should be run
841        before "make dist".
843    12. Fixed two fairly obscure bugs concerned with quantified caseless matching
844        with Unicode property support.
846        (a) For a maximizing quantifier, if the two different cases of the
847            character were of different lengths in their UTF-8 codings (there are
848            some cases like this - I found 11), and the matching function had to
849            back up over a mixture of the two cases, it incorrectly assumed they
850            were both the same length.
852        (b) When PCRE was configured to use the heap rather than the stack for
853            recursion during matching, it was not correctly preserving the data for
854            the other case of a UTF-8 character when checking ahead for a match
855            while processing a minimizing repeat. If the check also involved
856            matching a wide character, but failed, corruption could cause an
857            erroneous result when trying to check for a repeat of the original
858            character.
860    13. Some tidying changes to the testing mechanism:
862        (a) The RunTest script now detects the internal link size and whether there
863            is UTF-8 and UCP support by running ./pcretest -C instead of relying on
864            values substituted by "configure". (The RunGrepTest script already did
865            this for UTF-8.) The configure.ac script no longer substitutes the
866            relevant variables.
868        (b) The debugging options /B and /D in pcretest show the compiled bytecode
869            with length and offset values. This means that the output is different
870            for different internal link sizes. Test 2 is skipped for link sizes
871            other than 2 because of this, bypassing the problem. Unfortunately,
872            there was also a test in test 3 (the locale tests) that used /B and
873            failed for link sizes other than 2. Rather than cut the whole test out,
874            I have added a new /Z option to pcretest that replaces the length and
875            offset values with spaces. This is now used to make test 3 independent
876            of link size. (Test 2 will be tidied up later.)
878    14. If erroroffset was passed as NULL to pcre_compile, it provoked a
879        segmentation fault instead of returning the appropriate error message.
881    15. In multiline mode when the newline sequence was set to "any", the pattern
882        ^$ would give a match between the \r and \n of a subject such as "A\r\nB".
883        This doesn't seem right; it now treats the CRLF combination as the line
884        ending, and so does not match in that case. It's only a pattern such as ^$
885        that would hit this one: something like ^ABC$ would have failed after \r
886        and then tried again after \r\n.
888    16. Changed the comparison command for RunGrepTest from "diff -u" to "diff -ub"
889        in an attempt to make files that differ only in their line terminators
890        compare equal. This works on Linux.
892    17. Under certain error circumstances pcregrep might try to free random memory
893        as it exited. This is now fixed, thanks to valgrind.
895    19. In pcretest, if the pattern /(?m)^$/g<any> was matched against the string
896        "abc\r\n\r\n", it found an unwanted second match after the second \r. This
897        was because its rules for how to advance for /g after matching an empty
898        string at the end of a line did not allow for this case. They now check for
899        it specially.
901    20. pcretest is supposed to handle patterns and data of any length, by
902        extending its buffers when necessary. It was getting this wrong when the
903        buffer for a data line had to be extended.
905    21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or
906        CRLF as a newline sequence.
908    22. Code for handling Unicode properties in pcre_dfa_exec() wasn't being cut
909        out by #ifdef SUPPORT_UCP. This did no harm, as it could never be used, but
910        I have nevertheless tidied it up.
912    23. Added some casts to kill warnings from HP-UX ia64 compiler.
914    24. Added a man page for pcre-config.
917  Version 7.0 19-Dec-06  Version 7.0 19-Dec-06
918  ---------------------  ---------------------

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