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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.  When --colour was used with -o, the list of matching strings was not
28        coloured; this is different to GNU grep, so I have changed it to be the
29        same.
32    Version 7.8 05-Sep-08
33    ---------------------
35    1.  Replaced UCP searching code with optimized version as implemented for Ad
36        Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
37        stage table and inline lookup instead of a function, giving speed ups of 2
38        to 5 times on some simple patterns that I tested. Permission was given to
39        distribute the MultiStage2.py script that generates the tables (it's not in
40        the tarball, but is in the Subversion repository).
42    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
43        scripts.
45    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
46        a group with a zero qualifier. The result of the study could be incorrect,
47        or the function might crash, depending on the pattern.
49    4.  Caseless matching was not working for non-ASCII characters in back
50        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
51        It now works when Unicode Property Support is available.
53    5.  In pcretest, an escape such as \x{de} in the data was always generating
54        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
55        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
56        truncation.
58    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
60    7.  Added two (int) casts to pcregrep when printing the difference of two
61        pointers, in case they are 64-bit values.
63    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
64        test 2 if it fails.
66    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
67        and a #define of that name to empty if it is not externally set. This is to
68        allow users of MSVC to set it if necessary.
70    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
71        the convenience functions in the pcre_get.c source file.
73    11. An option change at the start of a pattern that had top-level alternatives
74        could cause overwriting and/or a crash. This command provoked a crash in
75        some environments:
77          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
79        This potential security problem was recorded as CVE-2008-2371.
81    12. For a pattern where the match had to start at the beginning or immediately
82        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
83        pcre_dfa_exec() could read past the end of the passed subject if there was
84        no match. To help with detecting such bugs (e.g. with valgrind), I modified
85        pcretest so that it places the subject at the end of its malloc-ed buffer.
87    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
88        exec() might read past the end of the data buffer in UTF-8 mode.
90    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
91        the data contained the byte 0x85 as part of a UTF-8 character within its
92        first line. This applied both to normal and DFA matching.
94    15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
95        /^[^d]*?$/8 failed to match "abc".
97    16. Added a missing copyright notice to pcrecpp_internal.h.
99    17. Make it more clear in the documentation that values returned from
100        pcre_exec() in ovector are byte offsets, not character counts.
102    18. Tidied a few places to stop certain compilers from issuing warnings.
104    19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
105        supplied by Stefan Weber. I made a further small update for 7.8 because
106        there is a change of source arrangements: the pcre_searchfuncs.c module is
107        replaced by pcre_ucd.c.
110    Version 7.7 07-May-08
111    ---------------------
113    1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
114        a string to a long long, pretend we don't even have a long long." This is
115        done by checking for the strtoq, strtoll, and _strtoi64 functions.
117    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
118        pre-7.6 versions, which defined a global no_arg variable instead of putting
119        it in the RE class. (See also #8 below.)
121    3.  Remove a line of dead code, identified by coverity and reported by Nuno
122        Lopes.
124    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
126        (1) The include/exclude patterns were being applied to the whole pathnames
127            of files, instead of just to the final components.
129        (2) If there was more than one level of directory, the subdirectories were
130            skipped unless they satisfied the include/exclude conditions. This is
131            inconsistent with GNU grep (and could even be seen as contrary to the
132            pcregrep specification - which I improved to make it absolutely clear).
133            The action now is always to scan all levels of directory, and just
134            apply the include/exclude patterns to regular files.
136    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
137        --exclude_dir in the tests to avoid scanning .svn directories.
139    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
140        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
141        doesn't support NULs in patterns.
143    7.  Added some missing "const"s to declarations of static tables in
144        pcre_compile.c and pcre_dfa_exec.c.
146    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
147        caused by fix #2  above. (Subsequently also a second patch to fix the
148        first patch. And a third patch - this was a messy problem.)
150    9.  Applied Craig's patch to remove the use of push_back().
152    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
153        matching function regexec().
155    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
156        which, however, unlike Perl's \g{...}, are subroutine calls, not back
157        references. PCRE supports relative numbers with this syntax (I don't think
158        Oniguruma does).
160    12. Previously, a group with a zero repeat such as (...){0} was completely
161        omitted from the compiled regex. However, this means that if the group
162        was called as a subroutine from elsewhere in the pattern, things went wrong
163        (an internal error was given). Such groups are now left in the compiled
164        pattern, with a new opcode that causes them to be skipped at execution
165        time.
167    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
168        to the way PCRE behaves:
170        (a) A lone ] character is dis-allowed (Perl treats it as data).
172        (b) A back reference to an unmatched subpattern matches an empty string
173            (Perl fails the current match path).
175        (c) A data ] in a character class must be notated as \] because if the
176            first data character in a class is ], it defines an empty class. (In
177            Perl it is not possible to have an empty class.) The empty class []
178            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
179            The negative empty class [^] matches any one character, independently
180            of the DOTALL setting.
182    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
183        non-existent subpattern following a character class starting with ']' and
184        containing () gave an internal compiling error instead of "reference to
185        non-existent subpattern". Fortunately, when the pattern did exist, the
186        compiled code was correct. (When scanning forwards to check for the
187        existencd of the subpattern, it was treating the data ']' as terminating
188        the class, so got the count wrong. When actually compiling, the reference
189        was subsequently set up correctly.)
191    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
192        it was being rejected as not supported by pcre_dfa_exec(), even though
193        other assertions are supported. I have made pcre_dfa_exec() support
194        (*FAIL).
196    16. The implementation of 13c above involved the invention of a new opcode,
197        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
198        cannot be changed at match time, I realized I could make a small
199        improvement to matching performance by compiling OP_ALLANY instead of
200        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
201        on the OP_ANY path.
203    17. Compiling pcretest on Windows with readline support failed without the
204        following two fixes: (1) Make the unistd.h include conditional on
205        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
207    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
208        ncurses library to be included for pcretest when ReadLine support is
209        requested, but also to allow for it to be overridden. This patch came from
210        Daniel Bergström.
212    19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
213        as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
214        any errors with the current Unicode tables. Thanks to Peter Kankowski for
215        spotting this.
218    Version 7.6 28-Jan-08
219    ---------------------
221    1.  A character class containing a very large number of characters with
222        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
223        overflow.
225    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
226        HAVE_LONG_LONG is not defined.
228    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
229        bring them up to date and include new features. This patch includes:
231        - Fixed PH's badly added libz and libbz2 support.
232        - Fixed a problem with static linking.
233        - Added pcredemo. [But later removed - see 7 below.]
234        - Fixed dftables problem and added an option.
235        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
236            HAVE_LONG_LONG.
237        - Added readline support for pcretest.
238        - Added an listing of the option settings after cmake has run.
240    4.  A user submitted a patch to Makefile that makes it easy to create
241        "pcre.dll" under mingw when using Configure/Make. I added stuff to
242        Makefile.am that cause it to include this special target, without
243        affecting anything else. Note that the same mingw target plus all
244        the other distribution libraries and programs are now supported
245        when configuring with CMake (see 6 below) instead of with
246        Configure/Make.
248    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
249        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
250        exported in the Windows port". It has not yet been confirmed that the patch
251        solves the problem, but it does no harm.
253    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
254        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
255        with CMake, and also correct the comment about stack recursion.
257    7.  Remove the automatic building of pcredemo from the ./configure system and
258        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
259        of a program that users should build themselves after PCRE is installed, so
260        building it automatically is not really right. What is more, it gave
261        trouble in some build environments.
263    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
266    Version 7.5 10-Jan-08
267    ---------------------
269    1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'
270        values in parens when parsing an RE using the C++ wrapper."
272    2.  Negative specials like \S did not work in character classes in UTF-8 mode.
273        Characters greater than 255 were excluded from the class instead of being
274        included.
276    3.  The same bug as (2) above applied to negated POSIX classes such as
277        [:^space:].
279    4.  PCRECPP_STATIC was referenced in pcrecpp_internal.h, but nowhere was it
280        defined or documented. It seems to have been a typo for PCRE_STATIC, so
281        I have changed it.
283    5.  The construct (?&) was not diagnosed as a syntax error (it referenced the
284        first named subpattern) and a construct such as (?&a) would reference the
285        first named subpattern whose name started with "a" (in other words, the
286        length check was missing). Both these problems are fixed. "Subpattern name
287        expected" is now given for (?&) (a zero-length name), and this patch also
288        makes it give the same error for \k'' (previously it complained that that
289        was a reference to a non-existent subpattern).
291    6.  The erroneous patterns (?+-a) and (?-+a) give different error messages;
292        this is right because (?- can be followed by option settings as well as by
293        digits. I have, however, made the messages clearer.
295    7.  Patterns such as (?(1)a|b) (a pattern that contains fewer subpatterns
296        than the number used in the conditional) now cause a compile-time error.
297        This is actually not compatible with Perl, which accepts such patterns, but
298        treats the conditional as always being FALSE (as PCRE used to), but it
299        seems to me that giving a diagnostic is better.
301    8.  Change "alphameric" to the more common word "alphanumeric" in comments
302        and messages.
304    9.  Fix two occurrences of "backslash" in comments that should have been
305        "backspace".
307    10. Remove two redundant lines of code that can never be obeyed (their function
308        was moved elsewhere).
310    11. The program that makes PCRE's Unicode character property table had a bug
311        which caused it to generate incorrect table entries for sequences of
312        characters that have the same character type, but are in different scripts.
313        It amalgamated them into a single range, with the script of the first of
314        them. In other words, some characters were in the wrong script. There were
315        thirteen such cases, affecting characters in the following ranges:
317          U+002b0 - U+002c1
318          U+0060c - U+0060d
319          U+0061e - U+00612
320          U+0064b - U+0065e
321          U+0074d - U+0076d
322          U+01800 - U+01805
323          U+01d00 - U+01d77
324          U+01d9b - U+01dbf
325          U+0200b - U+0200f
326          U+030fc - U+030fe
327          U+03260 - U+0327f
328          U+0fb46 - U+0fbb1
329          U+10450 - U+1049d
331    12. The -o option (show only the matching part of a line) for pcregrep was not
332        compatible with GNU grep in that, if there was more than one match in a
333        line, it showed only the first of them. It now behaves in the same way as
334        GNU grep.
336    13. If the -o and -v options were combined for pcregrep, it printed a blank
337        line for every non-matching line. GNU grep prints nothing, and pcregrep now
338        does the same. The return code can be used to tell if there were any
339        non-matching lines.
341    14. Added --file-offsets and --line-offsets to pcregrep.
343    15. The pattern (?=something)(?R) was not being diagnosed as a potentially
344        infinitely looping recursion. The bug was that positive lookaheads were not
345        being skipped when checking for a possible empty match (negative lookaheads
346        and both kinds of lookbehind were skipped).
348    16. Fixed two typos in the Windows-only code in pcregrep.c, and moved the
349        inclusion of <windows.h> to before rather than after the definition of
350        INVALID_FILE_ATTRIBUTES (patch from David Byron).
352    17. Specifying a possessive quantifier with a specific limit for a Unicode
353        character property caused pcre_compile() to compile bad code, which led at
354        runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this
355        are: /\p{Zl}{2,3}+/8 and /\p{Cc}{2}+/8. It was the possessive "+" that
356        caused the error; without that there was no problem.
358    18. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.
360    19. Added --enable-pcretest-libreadline.
362    20. In pcrecpp.cc, the variable 'count' was incremented twice in
363        RE::GlobalReplace(). As a result, the number of replacements returned was
364        double what it should be. I removed one of the increments, but Craig sent a
365        later patch that removed the other one (the right fix) and added unit tests
366        that check the return values (which was not done before).
368    21. Several CMake things:
370        (1) Arranged that, when cmake is used on Unix, the libraries end up with
371            the names libpcre and libpcreposix, not just pcre and pcreposix.
373        (2) The above change means that pcretest and pcregrep are now correctly
374            linked with the newly-built libraries, not previously installed ones.
378    22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
379        crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
380        UTF-8 newline character). The key issue is that the pattern starts .*;
381        this means that the match must be either at the beginning, or after a
382        newline. The bug was in the code for advancing after a failed match and
383        checking that the new position followed a newline. It was not taking
384        account of UTF-8 characters correctly.
386    23. PCRE was behaving differently from Perl in the way it recognized POSIX
387        character classes. PCRE was not treating the sequence [:...:] as a
388        character class unless the ... were all letters. Perl, however, seems to
389        allow any characters between [: and :], though of course it rejects as
390        unknown any "names" that contain non-letters, because all the known class
391        names consist only of letters. Thus, Perl gives an error for [[:1234:]],
392        for example, whereas PCRE did not - it did not recognize a POSIX character
393        class. This seemed a bit dangerous, so the code has been changed to be
394        closer to Perl. The behaviour is not identical to Perl, because PCRE will
395        diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
396        treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
397        Perl does, and where it didn't before.
399    24. Rewrite so as to remove the single use of %n from pcregrep because in some
400        Windows environments %n is disabled by default.
403    Version 7.4 21-Sep-07
404    ---------------------
406    1.  Change 7.3/28 was implemented for classes by looking at the bitmap. This
407        means that a class such as [\s] counted as "explicit reference to CR or
408        LF". That isn't really right - the whole point of the change was to try to
409        help when there was an actual mention of one of the two characters. So now
410        the change happens only if \r or \n (or a literal CR or LF) character is
411        encountered.
413    2.  The 32-bit options word was also used for 6 internal flags, but the numbers
414        of both had grown to the point where there were only 3 bits left.
415        Fortunately, there was spare space in the data structure, and so I have
416        moved the internal flags into a new 16-bit field to free up more option
417        bits.
419    3.  The appearance of (?J) at the start of a pattern set the DUPNAMES option,
420        but did not set the internal JCHANGED flag - either of these is enough to
421        control the way the "get" function works - but the PCRE_INFO_JCHANGED
422        facility is supposed to tell if (?J) was ever used, so now (?J) at the
423        start sets both bits.
425    4.  Added options (at build time, compile time, exec time) to change \R from
426        matching any Unicode line ending sequence to just matching CR, LF, or CRLF.
428    5.  doc/pcresyntax.html was missing from the distribution.
430    6.  Put back the definition of PCRE_ERROR_NULLWSLIMIT, for backward
431        compatibility, even though it is no longer used.
433    7.  Added macro for snprintf to pcrecpp_unittest.cc and also for strtoll and
434        strtoull to pcrecpp.cc to select the available functions in WIN32 when the
435        windows.h file is present (where different names are used). [This was
436        reversed later after testing - see 16 below.]
438    8.  Changed all #include <config.h> to #include "config.h". There were also
439        some further <pcre.h> cases that I changed to "pcre.h".
441    9.  When pcregrep was used with the --colour option, it missed the line ending
442        sequence off the lines that it output.
444    10. It was pointed out to me that arrays of string pointers cause lots of
445        relocations when a shared library is dynamically loaded. A technique of
446        using a single long string with a table of offsets can drastically reduce
447        these. I have refactored PCRE in four places to do this. The result is
448        dramatic:
450          Originally:                          290
451          After changing UCP table:            187
452          After changing error message table:   43
453          After changing table of "verbs"       36
454          After changing table of Posix names   22
456        Thanks to the folks working on Gregex for glib for this insight.
458    11. --disable-stack-for-recursion caused compiling to fail unless -enable-
459        unicode-properties was also set.
461    12. Updated the tests so that they work when \R is defaulted to ANYCRLF.
463    13. Added checks for ANY and ANYCRLF to pcrecpp.cc where it previously
464        checked only for CRLF.
466    14. Added casts to pcretest.c to avoid compiler warnings.
468    15. Added Craig's patch to various pcrecpp modules to avoid compiler warnings.
470    16. Added Craig's patch to remove the WINDOWS_H tests, that were not working,
471        and instead check for _strtoi64 explicitly, and avoid the use of snprintf()
472        entirely. This removes changes made in 7 above.
474    17. The CMake files have been updated, and there is now more information about
475        building with CMake in the NON-UNIX-USE document.
478    Version 7.3 28-Aug-07
479    ---------------------
481     1. In the rejigging of the build system that eventually resulted in 7.1, the
482        line "#include <pcre.h>" was included in pcre_internal.h. The use of angle
483        brackets there is not right, since it causes compilers to look for an
484        installed pcre.h, not the version that is in the source that is being
485        compiled (which of course may be different). I have changed it back to:
487          #include "pcre.h"
489        I have a vague recollection that the change was concerned with compiling in
490        different directories, but in the new build system, that is taken care of
491        by the VPATH setting the Makefile.
493     2. The pattern .*$ when run in not-DOTALL UTF-8 mode with newline=any failed
494        when the subject happened to end in the byte 0x85 (e.g. if the last
495        character was \x{1ec5}). *Character* 0x85 is one of the "any" newline
496        characters but of course it shouldn't be taken as a newline when it is part
497        of another character. The bug was that, for an unlimited repeat of . in
498        not-DOTALL UTF-8 mode, PCRE was advancing by bytes rather than by
499        characters when looking for a newline.
501     3. A small performance improvement in the DOTALL UTF-8 mode .* case.
503     4. Debugging: adjusted the names of opcodes for different kinds of parentheses
504        in debug output.
506     5. Arrange to use "%I64d" instead of "%lld" and "%I64u" instead of "%llu" for
507        long printing in the pcrecpp unittest when running under MinGW.
509     6. ESC_K was left out of the EBCDIC table.
511     7. Change 7.0/38 introduced a new limit on the number of nested non-capturing
512        parentheses; I made it 1000, which seemed large enough. Unfortunately, the
513        limit also applies to "virtual nesting" when a pattern is recursive, and in
514        this case 1000 isn't so big. I have been able to remove this limit at the
515        expense of backing off one optimization in certain circumstances. Normally,
516        when pcre_exec() would call its internal match() function recursively and
517        immediately return the result unconditionally, it uses a "tail recursion"
518        feature to save stack. However, when a subpattern that can match an empty
519        string has an unlimited repetition quantifier, it no longer makes this
520        optimization. That gives it a stack frame in which to save the data for
521        checking that an empty string has been matched. Previously this was taken
522        from the 1000-entry workspace that had been reserved. So now there is no
523        explicit limit, but more stack is used.
525     8. Applied Daniel's patches to solve problems with the import/export magic
526        syntax that is required for Windows, and which was going wrong for the
527        pcreposix and pcrecpp parts of the library. These were overlooked when this
528        problem was solved for the main library.
530     9. There were some crude static tests to avoid integer overflow when computing
531        the size of patterns that contain repeated groups with explicit upper
532        limits. As the maximum quantifier is 65535, the maximum group length was
533        set at 30,000 so that the product of these two numbers did not overflow a
534        32-bit integer. However, it turns out that people want to use groups that
535        are longer than 30,000 bytes (though not repeat them that many times).
536        Change 7.0/17 (the refactoring of the way the pattern size is computed) has
537        made it possible to implement the integer overflow checks in a much more
538        dynamic way, which I have now done. The artificial limitation on group
539        length has been removed - we now have only the limit on the total length of
540        the compiled pattern, which depends on the LINK_SIZE setting.
542    10. Fixed a bug in the documentation for get/copy named substring when
543        duplicate names are permitted. If none of the named substrings are set, the
544        functions return PCRE_ERROR_NOSUBSTRING (7); the doc said they returned an
545        empty string.
547    11. Because Perl interprets \Q...\E at a high level, and ignores orphan \E
548        instances, patterns such as [\Q\E] or [\E] or even [^\E] cause an error,
549        because the ] is interpreted as the first data character and the
550        terminating ] is not found. PCRE has been made compatible with Perl in this
551        regard. Previously, it interpreted [\Q\E] as an empty class, and [\E] could
552        cause memory overwriting.
554    10. Like Perl, PCRE automatically breaks an unlimited repeat after an empty
555        string has been matched (to stop an infinite loop). It was not recognizing
556        a conditional subpattern that could match an empty string if that
557        subpattern was within another subpattern. For example, it looped when
558        trying to match  (((?(1)X|))*)  but it was OK with  ((?(1)X|)*)  where the
559        condition was not nested. This bug has been fixed.
561    12. A pattern like \X?\d or \P{L}?\d in non-UTF-8 mode could cause a backtrack
562        past the start of the subject in the presence of bytes with the top bit
563        set, for example "\x8aBCD".
565    13. Added Perl 5.10 experimental backtracking controls (*FAIL), (*F), (*PRUNE),
566        (*SKIP), (*THEN), (*COMMIT), and (*ACCEPT).
568    14. Optimized (?!) to (*FAIL).
570    15. Updated the test for a valid UTF-8 string to conform to the later RFC 3629.
571        This restricts code points to be within the range 0 to 0x10FFFF, excluding
572        the "low surrogate" sequence 0xD800 to 0xDFFF. Previously, PCRE allowed the
573        full range 0 to 0x7FFFFFFF, as defined by RFC 2279. Internally, it still
574        does: it's just the validity check that is more restrictive.
576    16. Inserted checks for integer overflows during escape sequence (backslash)
577        processing, and also fixed erroneous offset values for syntax errors during
578        backslash processing.
580    17. Fixed another case of looking too far back in non-UTF-8 mode (cf 12 above)
581        for patterns like [\PPP\x8a]{1,}\x80 with the subject "A\x80".
583    18. An unterminated class in a pattern like (?1)\c[ with a "forward reference"
584        caused an overrun.
586    19. A pattern like (?:[\PPa*]*){8,} which had an "extended class" (one with
587        something other than just ASCII characters) inside a group that had an
588        unlimited repeat caused a loop at compile time (while checking to see
589        whether the group could match an empty string).
591    20. Debugging a pattern containing \p or \P could cause a crash. For example,
592        [\P{Any}] did so. (Error in the code for printing property names.)
594    21. An orphan \E inside a character class could cause a crash.
596    22. A repeated capturing bracket such as (A)? could cause a wild memory
597        reference during compilation.
599    23. There are several functions in pcre_compile() that scan along a compiled
600        expression for various reasons (e.g. to see if it's fixed length for look
601        behind). There were bugs in these functions when a repeated \p or \P was
602        present in the pattern. These operators have additional parameters compared
603        with \d, etc, and these were not being taken into account when moving along
604        the compiled data. Specifically:
606        (a) A item such as \p{Yi}{3} in a lookbehind was not treated as fixed
607            length.
609        (b) An item such as \pL+ within a repeated group could cause crashes or
610            loops.
612        (c) A pattern such as \p{Yi}+(\P{Yi}+)(?1) could give an incorrect
613            "reference to non-existent subpattern" error.
615        (d) A pattern like (\P{Yi}{2}\277)? could loop at compile time.
617    24. A repeated \S or \W in UTF-8 mode could give wrong answers when multibyte
618        characters were involved (for example /\S{2}/8g with "A\x{a3}BC").
620    25. Using pcregrep in multiline, inverted mode (-Mv) caused it to loop.
622    26. Patterns such as [\P{Yi}A] which include \p or \P and just one other
623        character were causing crashes (broken optimization).
625    27. Patterns such as (\P{Yi}*\277)* (group with possible zero repeat containing
626        \p or \P) caused a compile-time loop.
628    28. More problems have arisen in unanchored patterns when CRLF is a valid line
629        break. For example, the unstudied pattern [\r\n]A does not match the string
630        "\r\nA" because change 7.0/46 below moves the current point on by two
631        characters after failing to match at the start. However, the pattern \nA
632        *does* match, because it doesn't start till \n, and if [\r\n]A is studied,
633        the same is true. There doesn't seem any very clean way out of this, but
634        what I have chosen to do makes the common cases work: PCRE now takes note
635        of whether there can be an explicit match for \r or \n anywhere in the
636        pattern, and if so, 7.0/46 no longer applies. As part of this change,
637        there's a new PCRE_INFO_HASCRORLF option for finding out whether a compiled
638        pattern has explicit CR or LF references.
640    29. Added (*CR) etc for changing newline setting at start of pattern.
643    Version 7.2 19-Jun-07
644    ---------------------
646     1. If the fr_FR locale cannot be found for test 3, try the "french" locale,
647        which is apparently normally available under Windows.
649     2. Re-jig the pcregrep tests with different newline settings in an attempt
650        to make them independent of the local environment's newline setting.
652     3. Add code to configure.ac to remove -g from the CFLAGS default settings.
654     4. Some of the "internals" tests were previously cut out when the link size
655        was not 2, because the output contained actual offsets. The recent new
656        "Z" feature of pcretest means that these can be cut out, making the tests
657        usable with all link sizes.
659     5. Implemented Stan Switzer's goto replacement for longjmp() when not using
660        stack recursion. This gives a massive performance boost under BSD, but just
661        a small improvement under Linux. However, it saves one field in the frame
662        in all cases.
664     6. Added more features from the forthcoming Perl 5.10:
666        (a) (?-n) (where n is a string of digits) is a relative subroutine or
667            recursion call. It refers to the nth most recently opened parentheses.
669        (b) (?+n) is also a relative subroutine call; it refers to the nth next
670            to be opened parentheses.
672        (c) Conditions that refer to capturing parentheses can be specified
673            relatively, for example, (?(-2)... or (?(+3)...
675        (d) \K resets the start of the current match so that everything before
676            is not part of it.
678        (e) \k{name} is synonymous with \k<name> and \k'name' (.NET compatible).
680        (f) \g{name} is another synonym - part of Perl 5.10's unification of
681            reference syntax.
683        (g) (?| introduces a group in which the numbering of parentheses in each
684            alternative starts with the same number.
686        (h) \h, \H, \v, and \V match horizontal and vertical whitespace.
688     7. Added two new calls to pcre_fullinfo(): PCRE_INFO_OKPARTIAL and
691     8. A pattern such as  (.*(.)?)*  caused pcre_exec() to fail by either not
692        terminating or by crashing. Diagnosed by Viktor Griph; it was in the code
693        for detecting groups that can match an empty string.
695     9. A pattern with a very large number of alternatives (more than several
696        hundred) was running out of internal workspace during the pre-compile
697        phase, where pcre_compile() figures out how much memory will be needed. A
698        bit of new cunning has reduced the workspace needed for groups with
699        alternatives. The 1000-alternative test pattern now uses 12 bytes of
700        workspace instead of running out of the 4096 that are available.
702    10. Inserted some missing (unsigned int) casts to get rid of compiler warnings.
704    11. Applied patch from Google to remove an optimization that didn't quite work.
705        The report of the bug said:
707          pcrecpp::RE("a*").FullMatch("aaa") matches, while
708          pcrecpp::RE("a*?").FullMatch("aaa") does not, and
709          pcrecpp::RE("a*?\\z").FullMatch("aaa") does again.
711    12. If \p or \P was used in non-UTF-8 mode on a character greater than 127
712        it matched the wrong number of bytes.
715    Version 7.1 24-Apr-07
716    ---------------------
718     1. Applied Bob Rossi and Daniel G's patches to convert the build system to one
719        that is more "standard", making use of automake and other Autotools. There
720      is some re-arrangement of the files and adjustment of comments consequent      is some re-arrangement of the files and adjustment of comments consequent
721      on this.      on this.
723   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
724      for recursive directory scanning broke on some systems because the files      for recursive directory scanning broke on some systems because the files
725      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
726      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
727      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
728      alternative.      alternative.
730   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
731      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
732      people do their own conversions for various reasons). The problems      people do their own conversions for various reasons). The problems
733      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
734      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
735      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
736      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
737      encounters .br or .in.      .br or .in.
739   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
740      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
741      of those who have to compile without Autotools (compare pcre.h).      config.h.generic, for the benefit of those who have to compile without
742        Autotools (compare pcre.h, which is now distributed as pcre.h.generic).
743   5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan  
744      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
745      makevp.bat for the current PCRE, using the additional files !compile.txt,      Weber: (1) pcre_internal.h was missing some function renames; (2) updated
746      !linklib.txt, and pcregexp.pas.      makevp.bat for the current PCRE, using the additional files
747        makevp_c.txt, makevp_l.txt, and pcregexp.pas.
748   6. A Windows user reported a minor discrepancy with test 2, which turned out  
749      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
750        to be caused by a trailing space on an input line that had got lost in his
751      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.
753     7. Add -Wl,-R... flags in pcre-config.in for *BSD* systems, as I'm told
754        that is needed.
756     8. Mark ucp_table (in ucptable.h) and ucp_gentype (in pcre_ucp_searchfuncs.c)
757        as "const" (a) because they are and (b) because it helps the PHP
758        maintainers who have recently made a script to detect big data structures
759        in the php code that should be moved to the .rodata section. I remembered
760        to update Builducptable as well, so it won't revert if ucptable.h is ever
761        re-created.
763     9. Added some extra #ifdef SUPPORT_UTF8 conditionals into pcretest.c,
764        pcre_printint.src, pcre_compile.c, pcre_study.c, and pcre_tables.c, in
765        order to be able to cut out the UTF-8 tables in the latter when UTF-8
766        support is not required. This saves 1.5-2K of code, which is important in
767        some applications.
769        Later: more #ifdefs are needed in pcre_ord2utf8.c and pcre_valid_utf8.c
770        so as not to refer to the tables, even though these functions will never be
771        called when UTF-8 support is disabled. Otherwise there are problems with a
772        shared library.
774    10. Fixed two bugs in the emulated memmove() function in pcre_internal.h:
776        (a) It was defining its arguments as char * instead of void *.
778        (b) It was assuming that all moves were upwards in memory; this was true
779            a long time ago when I wrote it, but is no longer the case.
781        The emulated memove() is provided for those environments that have neither
782        memmove() nor bcopy(). I didn't think anyone used it these days, but that
783        is clearly not the case, as these two bugs were recently reported.
785    11. The script PrepareRelease is now distributed: it calls 132html, CleanTxt,
786        and Detrail to create the HTML documentation, the .txt form of the man
787        pages, and it removes trailing spaces from listed files. It also creates
788        pcre.h.generic and config.h.generic from pcre.h and config.h. In the latter
789        case, it wraps all the #defines with #ifndefs. This script should be run
790        before "make dist".
792    12. Fixed two fairly obscure bugs concerned with quantified caseless matching
793        with Unicode property support.
795        (a) For a maximizing quantifier, if the two different cases of the
796            character were of different lengths in their UTF-8 codings (there are
797            some cases like this - I found 11), and the matching function had to
798            back up over a mixture of the two cases, it incorrectly assumed they
799            were both the same length.
801        (b) When PCRE was configured to use the heap rather than the stack for
802            recursion during matching, it was not correctly preserving the data for
803            the other case of a UTF-8 character when checking ahead for a match
804            while processing a minimizing repeat. If the check also involved
805            matching a wide character, but failed, corruption could cause an
806            erroneous result when trying to check for a repeat of the original
807            character.
809    13. Some tidying changes to the testing mechanism:
811        (a) The RunTest script now detects the internal link size and whether there
812            is UTF-8 and UCP support by running ./pcretest -C instead of relying on
813            values substituted by "configure". (The RunGrepTest script already did
814            this for UTF-8.) The configure.ac script no longer substitutes the
815            relevant variables.
817        (b) The debugging options /B and /D in pcretest show the compiled bytecode
818            with length and offset values. This means that the output is different
819            for different internal link sizes. Test 2 is skipped for link sizes
820            other than 2 because of this, bypassing the problem. Unfortunately,
821            there was also a test in test 3 (the locale tests) that used /B and
822            failed for link sizes other than 2. Rather than cut the whole test out,
823            I have added a new /Z option to pcretest that replaces the length and
824            offset values with spaces. This is now used to make test 3 independent
825            of link size. (Test 2 will be tidied up later.)
827    14. If erroroffset was passed as NULL to pcre_compile, it provoked a
828        segmentation fault instead of returning the appropriate error message.
830    15. In multiline mode when the newline sequence was set to "any", the pattern
831        ^$ would give a match between the \r and \n of a subject such as "A\r\nB".
832        This doesn't seem right; it now treats the CRLF combination as the line
833        ending, and so does not match in that case. It's only a pattern such as ^$
834        that would hit this one: something like ^ABC$ would have failed after \r
835        and then tried again after \r\n.
837    16. Changed the comparison command for RunGrepTest from "diff -u" to "diff -ub"
838        in an attempt to make files that differ only in their line terminators
839        compare equal. This works on Linux.
841    17. Under certain error circumstances pcregrep might try to free random memory
842        as it exited. This is now fixed, thanks to valgrind.
844    19. In pcretest, if the pattern /(?m)^$/g<any> was matched against the string
845        "abc\r\n\r\n", it found an unwanted second match after the second \r. This
846        was because its rules for how to advance for /g after matching an empty
847        string at the end of a line did not allow for this case. They now check for
848        it specially.
850    20. pcretest is supposed to handle patterns and data of any length, by
851        extending its buffers when necessary. It was getting this wrong when the
852        buffer for a data line had to be extended.
854    21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or
855        CRLF as a newline sequence.
857    22. Code for handling Unicode properties in pcre_dfa_exec() wasn't being cut
858        out by #ifdef SUPPORT_UCP. This did no harm, as it could never be used, but
859        I have nevertheless tidied it up.
861    23. Added some casts to kill warnings from HP-UX ia64 compiler.
863    24. Added a man page for pcre-config.
866  Version 7.0 19-Dec-06  Version 7.0 19-Dec-06
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