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 5. The above bug also affected the handling of POSIX character classes such as
    [[:alpha:]] and [[:alnum:]]. These do not have their own bit maps in PCRE's
    permanent tables. Instead, the bit maps for such a class were previously
    created as the appropriate unions of the upper, lower, and digit bitmaps.
    Now they are created by subtraction from the [[:word:]] class, which has
    its own bitmap.

 6. The [[:blank:]] character class matches horizontal, but not vertical space.
    It is created by subtracting the vertical space characters (\x09, \x0a,
    \x0b, \x0c) from the [[:space:]] bitmap. Previously, however, the
    subtraction was done in the overall bitmap for a character class, meaning
    that a class such as [\x0c[:blank:]] was incorrect because \x0c would not
    be recognized. This bug has been fixed.

 7. Patches from the folks at Google:

      (a) pcrecpp.cc: "to handle a corner case that may or may not happen in
      real life, but is still worth protecting against".

      (b) pcrecpp.cc: "corrects a bug when negative radixes are used with
      regular expressions".

      (c) pcre_scanner.cc: avoid use of std::count() because not all systems
      have it.

      (d) Split off pcrecpparg.h from pcrecpp.h and had the former built by
      "configure" and the latter not, in order to fix a problem somebody had
      with compiling the Arg class on HP-UX.

      (e) Improve the error-handling of the C++ wrapper a little bit.

      (f) New tests for checking recursion limiting.

 8. The pcre_memmove() function, which is used only if the environment does not
    have a standard memmove() function (and is therefore rarely compiled),
    contained two bugs: (a) use of int instead of size_t, and (b) it was not
    returning a result (though PCRE never actually uses the result).

 9. In the POSIX regexec() interface, if nmatch is specified as a ridiculously
    large number - greater than INT_MAX/(3*sizeof(int)) - REG_ESPACE is
    returned instead of calling malloc() with an overflowing number that would
    most likely cause subsequent chaos.

10. The debugging option of pcretest was not showing the NO_AUTO_CAPTURE flag.

11. The POSIX flag REG_NOSUB is now supported. When a pattern that was compiled
    with this option is matched, the nmatch and pmatch options of regexec() are
    ignored.

12. Added REG_UTF8 to the POSIX interface. This is not defined by POSIX, but is
    provided in case anyone wants to the the POSIX interface with UTF-8
    strings.

13. Added CXXLDFLAGS to the Makefile parameters to provide settings only on the
    C++ linking (needed for some HP-UX environments).

14. Avoid compiler warnings in get_ucpname() when compiled without UCP support
    (unused parameter) and in the pcre_printint() function (omitted "default"
    switch label when the default is to do nothing).

15. Added some code to make it possible, when PCRE is compiled as a C++
    library, to replace subject pointers for pcre_exec() with a smart pointer
    class, thus making it possible to process discontinuous strings.

16. The two macros PCRE_EXPORT and PCRE_DATA_SCOPE are confusing, and perform
    much the same function. They were added by different people who were trying
    to make PCRE easy to compile on non-Unix systems. It has been suggested
    that PCRE_EXPORT be abolished now that there is more automatic apparatus
    for compiling on Windows systems. I have therefore replaced it with
    PCRE_DATA_SCOPE. This is set automatically for Windows; if not set it
    defaults to "extern" for C or "extern C" for C++, which works fine on
    Unix-like systems. It is now possible to override the value of PCRE_DATA_
    SCOPE with something explicit in config.h. In addition:

    (a) pcreposix.h still had just "extern" instead of either of these macros;
        I have replaced it with PCRE_DATA_SCOPE.

    (b) Functions such as _pcre_xclass(), which are internal to the library,
        but external in the C sense, all had PCRE_EXPORT in their definitions.
        This is apparently wrong for the Windows case, so I have removed it.
        (It makes no difference on Unix-like systems.)

17. Added a new limit, MATCH_LIMIT_RECURSION, which limits the depth of nesting
    of recursive calls to match(). This is different to MATCH_LIMIT because
    that limits the total number of calls to match(), not all of which increase
    the depth of recursion. Limiting the recursion depth limits the amount of
    stack (or heap if NO_RECURSE is set) that is used. The default can be set
    when PCRE is compiled, and changed at run time. A patch from Google adds
    this functionality to the C++ interface.

18. Changes to the handling of Unicode character properties:

    (a) Updated the table to Unicode 4.1.0.

    (b) Recognize characters that are not in the table as "Cn" (undefined).

    (c) I revised the way the table is implemented to a much improved format
        which includes recognition of ranges. It now supports the ranges that
        are defined in UnicodeData.txt, and it also amalgamates other
        characters into ranges. This has reduced the number of entries in the
        table from around 16,000 to around 3,000, thus reducing its size
        considerably. I realized I did not need to use a tree structure after
        all - a binary chop search is just as efficient. Having reduced the
        number of entries, I extended their size from 6 bytes to 8 bytes to
        allow for more data.

    (d) Added support for Unicode script names via properties such as \p{Han}.

19. In UTF-8 mode, a backslash followed by a non-Ascii character was not
    matching that character.

20. When matching a repeated Unicode property with a minimum greater than zero,
    (for example \pL{2,}), PCRE could look past the end of the subject if it
    reached it while seeking the minimum number of characters. This could
    happen only if some of the characters were more than one byte long, because
    there is a check for at least the minimum number of bytes.

21. Refactored the implementation of \p and \P so as to be more general, to
    allow for more different types of property in future. This has changed the
    compiled form incompatibly. Anybody with saved compiled patterns that use
    \p or \P will have to recompile them.

22. Added "Any" and "L&" to the supported property types.

23. Recognize \x{...} as a code point specifier, even when not in UTF-8 mode,
    but give a compile time error if the value is greater than 0xff.

24. The man pages for pcrepartial, pcreprecompile, and pcre_compile2 were
    accidentally not being installed or uninstalled.

25. The pcre.h file was built from pcre.h.in, but the only changes that were
    made were to insert the current release number. This seemed silly, because
    it made things harder for people building PCRE on systems that don't run
    "configure". I have turned pcre.h into a distributed file, no longer built
    by "configure", with the version identification directly included. There is
    no longer a pcre.h.in file.

    However, this change necessitated a change to the pcre-config script as
    well. It is built from pcre-config.in, and one of the substitutions was the
    release number. I have updated configure.ac so that ./configure now finds
    the release number by grepping pcre.h.

26. Added the ability to run the tests under valgrind.


Version 6.4 05-Sep-05
---------------------

 1. Change 6.0/10/(l) to pcregrep introduced a bug that caused separator lines
    "--" to be printed when multiple files were scanned, even when none of the
    -A, -B, or -C options were used. This is not compatible with Gnu grep, so I
    consider it to be a bug, and have restored the previous behaviour.

 2. A couple of code tidies to get rid of compiler warnings.

 3. The pcretest program used to cheat by referring to symbols in the library
    whose names begin with _pcre_. These are internal symbols that are not
    really supposed to be visible externally, and in some environments it is
    possible to suppress them. The cheating is now confined to including
    certain files from the library's source, which is a bit cleaner.

 4. Renamed pcre.in as pcre.h.in to go with pcrecpp.h.in; it also makes the
    file's purpose clearer.

 5. Reorganized pcre_ucp_findchar().


Version 6.3 15-Aug-05
---------------------

 1. The file libpcre.pc.in did not have general read permission in the tarball.

 2. There were some problems when building without C++ support:

    (a) If C++ support was not built, "make install" and "make test" still
        tried to test it.

    (b) There were problems when the value of CXX was explicitly set. Some
        changes have been made to try to fix these, and ...

    (c) --disable-cpp can now be used to explicitly disable C++ support.

    (d) The use of @CPP_OBJ@ directly caused a blank line preceded by a
        backslash in a target when C++ was disabled. This confuses some
        versions of "make", apparently. Using an intermediate variable solves
        this. (Same for CPP_LOBJ.)

 3. $(LINK_FOR_BUILD) now includes $(CFLAGS_FOR_BUILD) and $(LINK)
    (non-Windows) now includes $(CFLAGS) because these flags are sometimes
    necessary on certain architectures.

 4. Added a setting of -export-symbols-regex to the link command to remove
    those symbols that are exported in the C sense, but actually are local
    within the library, and not documented. Their names all begin with
    "_pcre_". This is not a perfect job, because (a) we have to except some
    symbols that pcretest ("illegally") uses, and (b) the facility isn't always
    available (and never for static libraries). I have made a note to try to
    find a way round (a) in the future.


Version 6.2 01-Aug-05
---------------------

 1. There was no test for integer overflow of quantifier values. A construction
    such as {1111111111111111} would give undefined results. What is worse, if
    a minimum quantifier for a parenthesized subpattern overflowed and became
    negative, the calculation of the memory size went wrong. This could have
    led to memory overwriting.

 2. Building PCRE using VPATH was broken. Hopefully it is now fixed.

 3. Added "b" to the 2nd argument of fopen() in dftables.c, for non-Unix-like
    operating environments where this matters.

 4. Applied Giuseppe Maxia's patch to add additional features for controlling
    PCRE options from within the C++ wrapper.

 5. Named capturing subpatterns were not being correctly counted when a pattern
    was compiled. This caused two problems: (a) If there were more than 100
    such subpatterns, the calculation of the memory needed for the whole
    compiled pattern went wrong, leading to an overflow error. (b) Numerical
    back references of the form \12, where the number was greater than 9, were
    not recognized as back references, even though there were sufficient
    previous subpatterns.

 6. Two minor patches to pcrecpp.cc in order to allow it to compile on older
    versions of gcc, e.g. 2.95.4.


Version 6.1 21-Jun-05
---------------------

 1. There was one reference to the variable "posix" in pcretest.c that was not
    surrounded by "#if !defined NOPOSIX".

 2. Make it possible to compile pcretest without DFA support, UTF8 support, or
    the cross-check on the old pcre_info() function, for the benefit of the
    cut-down version of PCRE that is currently imported into Exim.

 3. A (silly) pattern starting with (?i)(?-i) caused an internal space
    allocation error. I've done the easy fix, which wastes 2 bytes for sensible
    patterns that start (?i) but I don't think that matters. The use of (?i) is
    just an example; this all applies to the other options as well.

 4. Since libtool seems to echo the compile commands it is issuing, the output
    from "make" can be reduced a bit by putting "@" in front of each libtool
    compile command.

 5. Patch from the folks at Google for configure.in to be a bit more thorough
    in checking for a suitable C++ installation before trying to compile the
    C++ stuff. This should fix a reported problem when a compiler was present,
    but no suitable headers.

 6. The man pages all had just "PCRE" as their title. I have changed them to
    be the relevant file name. I have also arranged that these names are
    retained in the file doc/pcre.txt, which is a concatenation in text format
    of all the man pages except the little individual ones for each function.

 7. The NON-UNIX-USE file had not been updated for the different set of source
    files that come with release 6. I also added a few comments about the C++
    wrapper.