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 ChangeLog for PCRE  ChangeLog for PCRE
 ------------------  ------------------
   
   Version 8.34 15-December-2013
   -----------------------------
   
   1.  Add pcre[16|32]_jit_free_unused_memory to forcibly free unused JIT
       executable memory. Patch inspired by Carsten Klein.
   
   2.  ./configure --enable-coverage defined SUPPORT_GCOV in config.h, although
       this macro is never tested and has no effect, because the work to support
       coverage involves only compiling and linking options and special targets in
       the Makefile. The comment in config.h implied that defining the macro would
       enable coverage support, which is totally false. There was also support for
       setting this macro in the CMake files (my fault, I just copied it from
       configure). SUPPORT_GCOV has now been removed.
   
   3.  Make a small performance improvement in strlen16() and strlen32() in
       pcretest.
   
   4.  Change 36 for 8.33 left some unreachable statements in pcre_exec.c,
       detected by the Solaris compiler (gcc doesn't seem to be able to diagnose
       these cases). There was also one in pcretest.c.
   
   5.  Cleaned up a "may be uninitialized" compiler warning in pcre_exec.c.
   
   6.  In UTF mode, the code for checking whether a group could match an empty
       string (which is used for indefinitely repeated groups to allow for
       breaking an infinite loop) was broken when the group contained a repeated
       negated single-character class with a character that occupied more than one
       data item and had a minimum repetition of zero (for example, [^\x{100}]* in
       UTF-8 mode). The effect was undefined: the group might or might not be
       deemed as matching an empty string, or the program might have crashed.
   
   7.  The code for checking whether a group could match an empty string was not
       recognizing that \h, \H, \v, \V, and \R must match a character.
   
   8.  Implemented PCRE_INFO_MATCH_EMPTY, which yields 1 if the pattern can match
       an empty string. If it can, pcretest shows this in its information output.
   
   9.  Fixed two related bugs that applied to Unicode extended grapheme clusters
       that were repeated with a maximizing qualifier (e.g. \X* or \X{2,5}) when
       matched by pcre_exec() without using JIT:
   
       (a) If the rest of the pattern did not match after a maximal run of
           grapheme clusters, the code for backing up to try with fewer of them
           did not always back up over a full grapheme when characters that do not
           have the modifier quality were involved, e.g. Hangul syllables.
   
       (b) If the match point in a subject started with modifier character, and
           there was no match, the code could incorrectly back up beyond the match
           point, and potentially beyond the first character in the subject,
           leading to a segfault or an incorrect match result.
   
   10. A conditional group with an assertion condition could lead to PCRE
       recording an incorrect first data item for a match if no other first data
       item was recorded. For example, the pattern (?(?=ab)ab) recorded "a" as a
       first data item, and therefore matched "ca" after "c" instead of at the
       start.
   
   11. Change 40 for 8.33 (allowing pcregrep to find empty strings) showed up a
       bug that caused the command "echo a | ./pcregrep -M '|a'" to loop.
   
   12. The source of pcregrep now includes z/OS-specific code so that it can be
       compiled for z/OS as part of the special z/OS distribution.
   
   13. Added the -T and -TM options to pcretest.
   
   14. The code in pcre_compile.c for creating the table of named capturing groups
       has been refactored. Instead of creating the table dynamically during the
       actual compiling pass, the information is remembered during the pre-compile
       pass (on the stack unless there are more than 20 named groups, in which
       case malloc() is used) and the whole table is created before the actual
       compile happens. This has simplified the code (it is now nearly 150 lines
       shorter) and prepared the way for better handling of references to groups
       with duplicate names.
   
   15. A back reference to a named subpattern when there is more than one of the
       same name now checks them in the order in which they appear in the pattern.
       The first one that is set is used for the reference. Previously only the
       first one was inspected. This change makes PCRE more compatible with Perl.
   
   16. Unicode character properties were updated from Unicode 6.3.0.
   
   17. The compile-time code for auto-possessification has been refactored, based
       on a patch by Zoltan Herczeg. It now happens after instead of during
       compilation. The code is cleaner, and more cases are handled. The option
       PCRE_NO_AUTO_POSSESS is added for testing purposes, and the -O and /O
       options in pcretest are provided to set it. It can also be set by
       (*NO_AUTO_POSSESS) at the start of a pattern.
   
   18. The character VT has been added to the default ("C" locale) set of
       characters that match \s and are generally treated as white space,
       following this same change in Perl 5.18. There is now no difference between
       "Perl space" and "POSIX space". Whether VT is treated as white space in
       other locales depends on the locale.
   
   19. The code for checking named groups as conditions, either for being set or
       for being recursed, has been refactored (this is related to 14 and 15
       above). Processing unduplicated named groups should now be as fast at
       numerical groups, and processing duplicated groups should be faster than
       before.
   
   20. Two patches to the CMake build system, by Alexander Barkov:
   
         (1) Replace the "source" command by "." in CMakeLists.txt because
             "source" is a bash-ism.
   
         (2) Add missing HAVE_STDINT_H and HAVE_INTTYPES_H to config-cmake.h.in;
             without these the CMake build does not work on Solaris.
   
   21. Perl has changed its handling of \8 and \9. If there is no previously
       encountered capturing group of those numbers, they are treated as the
       literal characters 8 and 9 instead of a binary zero followed by the
       literals. PCRE now does the same.
   
   22. Following Perl, added \o{} to specify codepoints in octal, making it
       possible to specify values greater than 0777 and also making them
       unambiguous.
   
   23. Perl now gives an error for missing closing braces after \x{... instead of
       treating the string as literal. PCRE now does the same.
   
   24. RunTest used to grumble if an inappropriate test was selected explicitly,
       but just skip it when running all tests. This make it awkward to run ranges
       of tests when one of them was inappropriate. Now it just skips any
       inappropriate tests, as it always did when running all tests.
   
   25. If PCRE_AUTO_CALLOUT and PCRE_UCP were set for a pattern that contained
       character types such as \d or \w, too many callouts were inserted, and the
       data that they returned was rubbish.
   
   26. In UCP mode, \s was not matching two of the characters that Perl matches,
       namely NEL (U+0085) and MONGOLIAN VOWEL SEPARATOR (U+180E), though they
       were matched by \h. The code has now been refactored so that the lists of
       the horizontal and vertical whitespace characters used for \h and \v (which
       are defined only in one place) are now also used for \s.
   
   27. Add JIT support for the 64 bit TileGX architecture.
       Patch by Jiong Wang (Tilera Corporation).
   
   28. Possessive quantifiers for classes (both explicit and automatically
       generated) now use special opcodes instead of wrapping in ONCE brackets.
   
   29. Whereas an item such as A{4}+ ignored the possessivenes of the quantifier
       (because it's meaningless), this was not happening when PCRE_CASELESS was
       set. Not wrong, but inefficient.
   
   30. Updated perltest.pl to add /u (force Unicode mode) when /W (use Unicode
       properties for \w, \d, etc) is present in a test regex. Otherwise if the
       test contains no characters greater than 255, Perl doesn't realise it
       should be using Unicode semantics.
   
   31. Upgraded the handling of the POSIX classes [:graph:], [:print:], and
       [:punct:] when PCRE_UCP is set so as to include the same characters as Perl
       does in Unicode mode.
   
   32. Added the "forbid" facility to pcretest so that putting tests into the
       wrong test files can sometimes be quickly detected.
   
   33. There is now a limit (default 250) on the depth of nesting of parentheses.
       This limit is imposed to control the amount of system stack used at compile
       time. It can be changed at build time by --with-parens-nest-limit=xxx or
       the equivalent in CMake.
   
   34. Character classes such as [A-\d] or [a-[:digit:]] now cause compile-time
       errors. Perl warns for these when in warning mode, but PCRE has no facility
       for giving warnings.
   
   35. Change 34 for 8.13 allowed quantifiers on assertions, because Perl does.
       However, this was not working for (?!) because it is optimized to (*FAIL),
       for which PCRE does not allow quantifiers. The optimization is now disabled
       when a quantifier follows (?!). I can't see any use for this, but it makes
       things uniform.
   
   36. Perl no longer allows group names to start with digits, so I have made this
       change also in PCRE. It simplifies the code a bit.
   
   37. In extended mode, Perl ignores spaces before a + that indicates a
       possessive quantifier. PCRE allowed a space before the quantifier, but not
       before the possessive +. It now does.
   
   38. The use of \K (reset reported match start) within a repeated possessive
       group such as (a\Kb)*+ was not working.
   
   40. Document that the same character tables must be used at compile time and
       run time, and that the facility to pass tables to pcre_exec() and
       pcre_dfa_exec() is for use only with saved/restored patterns.
   
   41. Applied Jeff Trawick's patch CMakeLists.txt, which "provides two new
       features for Builds with MSVC:
   
       1. Support pcre.rc and/or pcreposix.rc (as is already done for MinGW
          builds). The .rc files can be used to set FileDescription and many other
          attributes.
   
       2. Add an option (-DINSTALL_MSVC_PDB) to enable installation of .pdb files.
          This allows higher-level build scripts which want .pdb files to avoid
          hard-coding the exact files needed."
   
   42. Added support for [[:<:]] and [[:>:]] as used in the BSD POSIX library to
       mean "start of word" and "end of word", respectively, as a transition aid.
   
   43. A minimizing repeat of a class containing codepoints greater than 255 in
       non-UTF 16-bit or 32-bit modes caused an internal error when PCRE was
       compiled to use the heap for recursion.
   
   44. Got rid of some compiler warnings for unused variables when UTF but not UCP
       is configured.
   
   
   Version 8.33 28-May-2013
   ------------------------
   
   1.  Added 'U' to some constants that are compared to unsigned integers, to
       avoid compiler signed/unsigned warnings. Added (int) casts to unsigned
       variables that are added to signed variables, to ensure the result is
       signed and can be negated.
   
   2.  Applied patch by Daniel Richard G for quashing MSVC warnings to the
       CMake config files.
   
   3.  Revise the creation of config.h.generic so that all boolean macros are
       #undefined, whereas non-boolean macros are #ifndef/#endif-ed. This makes
       overriding via -D on the command line possible.
   
   4.  Changing the definition of the variable "op" in pcre_exec.c from pcre_uchar
       to unsigned int is reported to make a quite noticeable speed difference in
       a specific Windows environment. Testing on Linux did also appear to show
       some benefit (and it is clearly not harmful). Also fixed the definition of
       Xop which should be unsigned.
   
   5.  Related to (4), changing the definition of the intermediate variable cc
       in repeated character loops from pcre_uchar to pcre_uint32 also gave speed
       improvements.
   
   6.  Fix forward search in JIT when link size is 3 or greater. Also removed some
       unnecessary spaces.
   
   7.  Adjust autogen.sh and configure.ac to lose warnings given by automake 1.12
       and later.
   
   8.  Fix two buffer over read issues in 16 and 32 bit modes. Affects JIT only.
   
   9.  Optimizing fast_forward_start_bits in JIT.
   
   10. Adding support for callouts in JIT, and fixing some issues revealed
       during this work. Namely:
   
       (a) Unoptimized capturing brackets incorrectly reset on backtrack.
   
       (b) Minimum length was not checked before the matching is started.
   
   11. The value of capture_last that is passed to callouts was incorrect in some
       cases when there was a capture on one path that was subsequently abandoned
       after a backtrack. Also, the capture_last value is now reset after a
       recursion, since all captures are also reset in this case.
   
   12. The interpreter no longer returns the "too many substrings" error in the
       case when an overflowing capture is in a branch that is subsequently
       abandoned after a backtrack.
   
   13. In the pathological case when an offset vector of size 2 is used, pcretest
       now prints out the matched string after a yield of 0 or 1.
   
   14. Inlining subpatterns in recursions, when certain conditions are fulfilled.
       Only supported by the JIT compiler at the moment.
   
   15. JIT compiler now supports 32 bit Macs thanks to Lawrence Velazquez.
   
   16. Partial matches now set offsets[2] to the "bumpalong" value, that is, the
       offset of the starting point of the matching process, provided the offsets
       vector is large enough.
   
   17. The \A escape now records a lookbehind value of 1, though its execution
       does not actually inspect the previous character. This is to ensure that,
       in partial multi-segment matching, at least one character from the old
       segment is retained when a new segment is processed. Otherwise, if there
       are no lookbehinds in the pattern, \A might match incorrectly at the start
       of a new segment.
   
   18. Added some #ifdef __VMS code into pcretest.c to help VMS implementations.
   
   19. Redefined some pcre_uchar variables in pcre_exec.c as pcre_uint32; this
       gives some modest performance improvement in 8-bit mode.
   
   20. Added the PCRE-specific property \p{Xuc} for matching characters that can
       be expressed in certain programming languages using Universal Character
       Names.
   
   21. Unicode validation has been updated in the light of Unicode Corrigendum #9,
       which points out that "non characters" are not "characters that may not
       appear in Unicode strings" but rather "characters that are reserved for
       internal use and have only local meaning".
   
   22. When a pattern was compiled with automatic callouts (PCRE_AUTO_CALLOUT) and
       there was a conditional group that depended on an assertion, if the
       assertion was false, the callout that immediately followed the alternation
       in the condition was skipped when pcre_exec() was used for matching.
   
   23. Allow an explicit callout to be inserted before an assertion that is the
       condition for a conditional group, for compatibility with automatic
       callouts, which always insert a callout at this point.
   
   24. In 8.31, (*COMMIT) was confined to within a recursive subpattern. Perl also
       confines (*SKIP) and (*PRUNE) in the same way, and this has now been done.
   
   25. (*PRUNE) is now supported by the JIT compiler.
   
   26. Fix infinite loop when /(?<=(*SKIP)ac)a/ is matched against aa.
   
   27. Fix the case where there are two or more SKIPs with arguments that may be
       ignored.
   
   28. (*SKIP) is now supported by the JIT compiler.
   
   29. (*THEN) is now supported by the JIT compiler.
   
   30. Update RunTest with additional test selector options.
   
   31. The way PCRE handles backtracking verbs has been changed in two ways.
   
       (1) Previously, in something like (*COMMIT)(*SKIP), COMMIT would override
       SKIP. Now, PCRE acts on whichever backtracking verb is reached first by
       backtracking. In some cases this makes it more Perl-compatible, but Perl's
       rather obscure rules do not always do the same thing.
   
       (2) Previously, backtracking verbs were confined within assertions. This is
       no longer the case for positive assertions, except for (*ACCEPT). Again,
       this sometimes improves Perl compatibility, and sometimes does not.
   
   32. A number of tests that were in test 2 because Perl did things differently
       have been moved to test 1, because either Perl or PCRE has changed, and
       these tests are now compatible.
   
   32. Backtracking control verbs are now handled in the same way in JIT and
       interpreter.
   
   33. An opening parenthesis in a MARK/PRUNE/SKIP/THEN name in a pattern that
       contained a forward subroutine reference caused a compile error.
   
   34. Auto-detect and optimize limited repetitions in JIT.
   
   35. Implement PCRE_NEVER_UTF to lock out the use of UTF, in particular,
       blocking (*UTF) etc.
   
   36. In the interpreter, maximizing pattern repetitions for characters and
       character types now use tail recursion, which reduces stack usage.
   
   37. The value of the max lookbehind was not correctly preserved if a compiled
       and saved regex was reloaded on a host of different endianness.
   
   38. Implemented (*LIMIT_MATCH) and (*LIMIT_RECURSION). As part of the extension
       of the compiled pattern block, expand the flags field from 16 to 32 bits
       because it was almost full.
   
   39. Try madvise first before posix_madvise.
   
   40. Change 7 for PCRE 7.9 made it impossible for pcregrep to find empty lines
       with a pattern such as ^$. It has taken 4 years for anybody to notice! The
       original change locked out all matches of empty strings. This has been
       changed so that one match of an empty string per line is recognized.
       Subsequent searches on the same line (for colouring or for --only-matching,
       for example) do not recognize empty strings.
   
   41. Applied a user patch to fix a number of spelling mistakes in comments.
   
   42. Data lines longer than 65536 caused pcretest to crash.
   
   43. Clarified the data type for length and startoffset arguments for pcre_exec
       and pcre_dfa_exec in the function-specific man pages, where they were
       explicitly stated to be in bytes, never having been updated. I also added
       some clarification to the pcreapi man page.
   
   44. A call to pcre_dfa_exec() with an output vector size less than 2 caused
       a segmentation fault.
   
   
   Version 8.32 30-November-2012
   -----------------------------
   
   1.  Improved JIT compiler optimizations for first character search and single
       character iterators.
   
   2.  Supporting IBM XL C compilers for PPC architectures in the JIT compiler.
       Patch by Daniel Richard G.
   
   3.  Single character iterator optimizations in the JIT compiler.
   
   4.  Improved JIT compiler optimizations for character ranges.
   
   5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.
       Reported by Giuseppe D'Angelo.
   
   6.  The PCRE_STARTLINE bit, indicating that a match can occur only at the start
       of a line, was being set incorrectly in cases where .* appeared inside
       atomic brackets at the start of a pattern, or where there was a subsequent
       *PRUNE or *SKIP.
   
   7.  Improved instruction cache flush for POWER/PowerPC.
       Patch by Daniel Richard G.
   
   8.  Fixed a number of issues in pcregrep, making it more compatible with GNU
       grep:
   
       (a) There is now no limit to the number of patterns to be matched.
   
       (b) An error is given if a pattern is too long.
   
       (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir
           are now supported.
   
       (d) --exclude-from and --include-from (multiple use) have been added.
   
       (e) Exclusions and inclusions now apply to all files and directories, not
           just to those obtained from scanning a directory recursively.
   
       (f) Multiple uses of -f and --file-list are now supported.
   
       (g) In a Windows environment, the default for -d has been changed from
           "read" (the GNU grep default) to "skip", because otherwise the presence
           of a directory in the file list provokes an error.
   
       (h) The documentation has been revised and clarified in places.
   
   9.  Improve the matching speed of capturing brackets.
   
   10. Changed the meaning of \X so that it now matches a Unicode extended
       grapheme cluster.
   
   11. Patch by Daniel Richard G to the autoconf files to add a macro for sorting
       out POSIX threads when JIT support is configured.
   
   12. Added support for PCRE_STUDY_EXTRA_NEEDED.
   
   13. In the POSIX wrapper regcomp() function, setting re_nsub field in the preg
       structure could go wrong in environments where size_t is not the same size
       as int.
   
   14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be
       set.
   
   15. The EBCDIC support had decayed; later updates to the code had included
       explicit references to (e.g.) \x0a instead of CHAR_LF. There has been a
       general tidy up of EBCDIC-related issues, and the documentation was also
       not quite right. There is now a test that can be run on ASCII systems to
       check some of the EBCDIC-related things (but is it not a full test).
   
   16. The new PCRE_STUDY_EXTRA_NEEDED option is now used by pcregrep, resulting
       in a small tidy to the code.
   
   17. Fix JIT tests when UTF is disabled and both 8 and 16 bit mode are enabled.
   
   18. If the --only-matching (-o) option in pcregrep is specified multiple
       times, each one causes appropriate output. For example, -o1 -o2 outputs the
       substrings matched by the 1st and 2nd capturing parentheses. A separating
       string can be specified by --om-separator (default empty).
   
   19. Improving the first n character searches.
   
   20. Turn case lists for horizontal and vertical white space into macros so that
       they are defined only once.
   
   21. This set of changes together give more compatible Unicode case-folding
       behaviour for characters that have more than one other case when UCP
       support is available.
   
       (a) The Unicode property table now has offsets into a new table of sets of
           three or more characters that are case-equivalent. The MultiStage2.py
           script that generates these tables (the pcre_ucd.c file) now scans
           CaseFolding.txt instead of UnicodeData.txt for character case
           information.
   
       (b) The code for adding characters or ranges of characters to a character
           class has been abstracted into a generalized function that also handles
           case-independence. In UTF-mode with UCP support, this uses the new data
           to handle characters with more than one other case.
   
       (c) A bug that is fixed as a result of (b) is that codepoints less than 256
           whose other case is greater than 256 are now correctly matched
           caselessly. Previously, the high codepoint matched the low one, but not
           vice versa.
   
       (d) The processing of \h, \H, \v, and \ in character classes now makes use
           of the new class addition function, using character lists defined as
           macros alongside the case definitions of 20 above.
   
       (e) Caseless back references now work with characters that have more than
           one other case.
   
       (f) General caseless matching of characters with more than one other case
           is supported.
   
   22. Unicode character properties were updated from Unicode 6.2.0
   
   23. Improved CMake support under Windows. Patch by Daniel Richard G.
   
   24. Add support for 32-bit character strings, and UTF-32
   
   25. Major JIT compiler update (code refactoring and bugfixing).
       Experimental Sparc 32 support is added.
   
   26. Applied a modified version of Daniel Richard G's patch to create
       pcre.h.generic and config.h.generic by "make" instead of in the
       PrepareRelease script.
   
   27. Added a definition for CHAR_NULL (helpful for the z/OS port), and use it in
       pcre_compile.c when checking for a zero character.
   
   28. Introducing a native interface for JIT. Through this interface, the compiled
       machine code can be directly executed. The purpose of this interface is to
       provide fast pattern matching, so several sanity checks are not performed.
       However, feature tests are still performed. The new interface provides
       1.4x speedup compared to the old one.
   
   29. If pcre_exec() or pcre_dfa_exec() was called with a negative value for
       the subject string length, the error given was PCRE_ERROR_BADOFFSET, which
       was confusing. There is now a new error PCRE_ERROR_BADLENGTH for this case.
   
   30. In 8-bit UTF-8 mode, pcretest failed to give an error for data codepoints
       greater than 0x7fffffff (which cannot be represented in UTF-8, even under
       the "old" RFC 2279). Instead, it ended up passing a negative length to
       pcre_exec().
   
   31. Add support for GCC's visibility feature to hide internal functions.
   
   32. Running "pcretest -C pcre8" or "pcretest -C pcre16" gave a spurious error
       "unknown -C option" after outputting 0 or 1.
   
   33. There is now support for generating a code coverage report for the test
       suite in environments where gcc is the compiler and lcov is installed. This
       is mainly for the benefit of the developers.
   
   34. If PCRE is built with --enable-valgrind, certain memory regions are marked
       unaddressable using valgrind annotations, allowing valgrind to detect
       invalid memory accesses. This is mainly for the benefit of the developers.
   
   25. (*UTF) can now be used to start a pattern in any of the three libraries.
   
   26. Give configure error if --enable-cpp but no C++ compiler found.
   
   
 Version 8.31 06-July-2012  Version 8.31 06-July-2012
 -------------------------  -------------------------
   
Line 1344  Version 7.9 11-Apr-09 Line 1883  Version 7.9 11-Apr-09
 7.  A pattern that could match an empty string could cause pcregrep to loop; it  7.  A pattern that could match an empty string could cause pcregrep to loop; it
     doesn't make sense to accept an empty string match in pcregrep, so I have      doesn't make sense to accept an empty string match in pcregrep, so I have
     locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this      locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
    seems to be how GNU grep behaves.    seems to be how GNU grep behaves. [But see later change 40 for release
     8.33.]
   
 8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at  8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
     start or after a newline", because the conditional assertion was not being      start or after a newline", because the conditional assertion was not being
Line 1587  Version 7.7 07-May-08 Line 2127  Version 7.7 07-May-08
     containing () gave an internal compiling error instead of "reference to      containing () gave an internal compiling error instead of "reference to
     non-existent subpattern". Fortunately, when the pattern did exist, the      non-existent subpattern". Fortunately, when the pattern did exist, the
     compiled code was correct. (When scanning forwards to check for the      compiled code was correct. (When scanning forwards to check for the
    existencd of the subpattern, it was treating the data ']' as terminating    existence of the subpattern, it was treating the data ']' as terminating
     the class, so got the count wrong. When actually compiling, the reference      the class, so got the count wrong. When actually compiling, the reference
     was subsequently set up correctly.)      was subsequently set up correctly.)
   
Removed from v.1.1.1.3  
changed lines
  Added in v.1.1.1.5

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