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 ChangeLog for PCRE  ChangeLog for PCRE
 ------------------  ------------------
   
   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
   -------------------------
   
   1.  Fixing a wrong JIT test case and some compiler warnings.
   
   2.  Removed a bashism from the RunTest script.
   
   3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
       to unsigned type, result still unsigned" that was given by an MS compiler
       on encountering the code "-sizeof(xxx)".
   
   4.  Partial matching support is added to the JIT compiler.
   
   5.  Fixed several bugs concerned with partial matching of items that consist
       of more than one character:
   
       (a) /^(..)\1/ did not partially match "aba" because checking references was
           done on an "all or nothing" basis. This also applied to repeated
           references.
   
       (b) \R did not give a hard partial match if \r was found at the end of the
           subject.
   
       (c) \X did not give a hard partial match after matching one or more
           characters at the end of the subject.
   
       (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
           a partial match for the string "\r".
   
       (e) When newline was set to CRLF, the metacharacter "." did not recognize
           a partial match for a CR character at the end of the subject string.
   
   6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
       running pcretest, the text "(JIT)" added to the output whenever JIT is
       actually used to run the match.
   
   7.  Individual JIT compile options can be set in pcretest by following -s+[+]
       or /S+[+] with a digit between 1 and 7.
   
   8.  OP_NOT now supports any UTF character not just single-byte ones.
   
   9.  (*MARK) control verb is now supported by the JIT compiler.
   
   10. The command "./RunTest list" lists the available tests without actually
       running any of them. (Because I keep forgetting what they all are.)
   
   11. Add PCRE_INFO_MAXLOOKBEHIND.
   
   12. Applied a (slightly modified) user-supplied patch that improves performance
       when the heap is used for recursion (compiled with --disable-stack-for-
       recursion). Instead of malloc and free for each heap frame each time a
       logical recursion happens, frames are retained on a chain and re-used where
       possible. This sometimes gives as much as 30% improvement.
   
   13. As documented, (*COMMIT) is now confined to within a recursive subpattern
       call.
   
   14. As documented, (*COMMIT) is now confined to within a positive assertion.
   
   15. It is now possible to link pcretest with libedit as an alternative to
       libreadline.
   
   16. (*COMMIT) control verb is now supported by the JIT compiler.
   
   17. The Unicode data tables have been updated to Unicode 6.1.0.
   
   18. Added --file-list option to pcregrep.
   
   19. Added binary file support to pcregrep, including the -a, --binary-files,
       -I, and --text options.
   
   20. The madvise function is renamed for posix_madvise for QNX compatibility
       reasons. Fixed by Giuseppe D'Angelo.
   
   21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
   
   22. Changed the option for creating symbolic links for 16-bit man pages from
       -s to -sf so that re-installing does not cause issues.
   
   23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
   
   24. Fixed a very old bug in pcretest that caused errors with restarted DFA
       matches in certain environments (the workspace was not being correctly
       retained). Also added to pcre_dfa_exec() a simple plausibility check on
       some of the workspace data at the beginning of a restart.
   
   25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
       was not doing so when it should - probably a typo introduced by SVN 528
       (change 8.10/14).
   
   26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
       \w+ when the character tables indicated that \x{c4} was a word character.
       There were several related cases, all because the tests for doing a table
       lookup were testing for characters less than 127 instead of 255.
   
   27. If a pattern contains capturing parentheses that are not used in a match,
       their slots in the ovector are set to -1. For those that are higher than
       any matched groups, this happens at the end of processing. In the case when
       there were back references that the ovector was too small to contain
       (causing temporary malloc'd memory to be used during matching), and the
       highest capturing number was not used, memory off the end of the ovector
       was incorrectly being set to -1. (It was using the size of the temporary
       memory instead of the true size.)
   
   28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
       ovector size, it uses memory at the end of the block that it has got.
   
   29. Check for an overlong MARK name and give an error at compile time. The
       limit is 255 for the 8-bit library and 65535 for the 16-bit library.
   
   30. JIT compiler update.
   
   31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
       Rill for the patch.
   
   32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
   
   33. Variable renamings in the PCRE-JIT compiler. No functionality change.
   
   34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
       SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
       was enabled.
   
   35. Improve JIT code generation for greedy plus quantifier.
   
   36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
       1 to "aa" instead of to an empty string. The bug affected repeated groups
       that could potentially match an empty string.
   
   37. Optimizing single character iterators in JIT.
   
   38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
       the same checks as \x{...} characters in non-JavaScript mode. Specifically,
       codepoints that are too big for the mode are faulted, and in a UTF mode,
       disallowed codepoints are also faulted.
   
   39. If PCRE was compiled with UTF support, in three places in the DFA
       matcher there was code that should only have been obeyed in UTF mode, but
       was being obeyed unconditionally. In 8-bit mode this could cause incorrect
       processing when bytes with values greater than 127 were present. In 16-bit
       mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
       both cases the values are those that cannot be the first data item in a UTF
       character. The three items that might have provoked this were recursions,
       possessively repeated groups, and atomic groups.
   
   40. Ensure that libpcre is explicitly listed in the link commands for pcretest
       and pcregrep, because some OS require shared objects to be explicitly
       passed to ld, causing the link step to fail if they are not.
   
   41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
       mode, patterns that started with \h* or \R* might be incorrectly matched.
   
   
   Version 8.30 04-February-2012
   -----------------------------
   
   1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
       name is defined in ctype.h.
   
   2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
       only in quite long subpatterns.
   
   3.  Removed the function pcre_info(), which has been obsolete and deprecated
       since it was replaced by pcre_fullinfo() in February 2000.
   
   4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
       match a (*MARK), and the match failed at the start of the subject, a
       reference to memory before the start of the subject could occur. This bug
       was introduced by fix 17 of release 8.21.
   
   5.  A reference to an unset group with zero minimum repetition was giving
       totally wrong answers (in non-JavaScript-compatibility mode). For example,
       /(another)?(\1?)test/ matched against "hello world test". This bug was
       introduced in release 8.13.
   
   6.  Add support for 16-bit character strings (a large amount of work involving
       many changes and refactorings).
   
   7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
       command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
       from a file.
   
   8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
       rounding is not applied in this particular case).
   
   9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
       if they appear, or are escaped, in patterns.
   
   10. Get rid of a number of -Wunused-but-set-variable warnings.
   
   11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
       "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
       Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
       also returns the mark "x". This bug applied to capturing parentheses,
       non-capturing parentheses, and atomic parentheses. It also applied to some
       assertions.
   
   12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
       information out of configure.ac instead of relying on pcre.h.generic, which
       is not stored in the repository.
   
   13. Applied Dmitry V. Levin's patch for a more portable method for linking with
       -lreadline.
   
   14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
   
   15. Applied Graycode's patch to put the top-level frame on the stack rather
       than the heap when not using the stack for recursion. This gives a
       performance improvement in many cases when recursion is not deep.
   
   16. Experimental code added to "pcretest -C" to output the stack frame size.
   
   
 Version 8.21 12-Dec-2011  Version 8.21 12-Dec-2011
 ------------------------  ------------------------
   
Line 1131  Version 7.9 11-Apr-09 Line 1675  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 1374  Version 7.7 07-May-08 Line 1919  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.1.1.1.1  
changed lines
  Added in v.1.1.1.4

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