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-revision 279 by ph10,
Tue Dec  4 20:01:43 2007 UTC
+revision 588 by ph10,
Sat Jan 15 11:22:47 2011 UTC
 Line 1
  ChangeLog for PCRE
  ------------------
- Version 7.5 12-Nov-07
+ Version 8.15 12-Jan-2011
+ ------------------------
+.  Fixed some typos in the markup of the man pages, and wrote a script that
+     checks for such things as part of the documentation building process.
+.  On a big-endian 64-bit system, pcregrep did not correctly process the
+     --match-limit and --recursion-limit options (added for 8.11). In
+     particular, this made one of the standard tests fail. (The integer value
+     went into the wrong half of a long int.)
+.  If the --colour option was given to pcregrep with -v (invert match), it
+     did strange things, either producing crazy output, or crashing. It should,
+     of course, ignore a request for colour when reporting lines that do not
+     match.
+.  Another pcregrep bug caused similar problems if --colour was specified with
+     -M (multiline) and the pattern match finished with a line ending.
+.  In pcregrep, when a pattern that ended with a literal newline sequence was
+     matched in multiline mode, the following line was shown as part of the
+     match. This seems wrong, so I have changed it.
+.  Another pcregrep bug in multiline mode, when --colour was specified, caused
+     the check for further matches in the same line (so they could be coloured)
+     to overrun the end of the current line. If another match was found, it was
+     incorrectly shown (and then shown again when found in the next line).
+.  If pcregrep was compiled under Windows, there was a reference to the
+     function pcregrep_exit() before it was defined. I am assuming this was
+     the cause of the "error C2371: 'pcregrep_exit' : redefinition;" that was
+     reported by a user. I've moved the definition above the reference.
+ Version 8.11 10-Dec-2010
+ ------------------------
+.  (*THEN) was not working properly if there were untried alternatives prior
+     to it in the current branch. For example, in ((a|b)(*THEN)(*F)|c..) it
+     backtracked to try for "b" instead of moving to the next alternative branch
+     at the same level (in this case, to look for "c"). The Perl documentation
+     is clear that when (*THEN) is backtracked onto, it goes to the "next
+     alternative in the innermost enclosing group".
+.  (*COMMIT) was not overriding (*THEN), as it does in Perl. In a pattern
+     such as   (A(*COMMIT)B(*THEN)C|D)  any failure after matching A should
+     result in overall failure. Similarly, (*COMMIT) now overrides (*PRUNE) and
+     (*SKIP), (*SKIP) overrides (*PRUNE) and (*THEN), and (*PRUNE) overrides
+     (*THEN).
+.  If \s appeared in a character class, it removed the VT character from
+     the class, even if it had been included by some previous item, for example
+     in [\x00-\xff\s]. (This was a bug related to the fact that VT is not part
+     of \s, but is part of the POSIX "space" class.)
+.  A partial match never returns an empty string (because you can always
+     match an empty string at the end of the subject); however the checking for
+     an empty string was starting at the "start of match" point. This has been
+     changed to the "earliest inspected character" point, because the returned
+     data for a partial match starts at this character. This means that, for
+     example, /(?<=abc)def/ gives a partial match for the subject "abc"
+     (previously it gave "no match").
+.  Changes have been made to the way PCRE_PARTIAL_HARD affects the matching
+     of $, \z, \Z, \b, and \B. If the match point is at the end of the string,
+     previously a full match would be given. However, setting PCRE_PARTIAL_HARD
+     has an implication that the given string is incomplete (because a partial
+     match is preferred over a full match). For this reason, these items now
+     give a partial match in this situation. [Aside: previously, the one case
+     /t\b/ matched against "cat" with PCRE_PARTIAL_HARD set did return a partial
+     match rather than a full match, which was wrong by the old rules, but is
+     now correct.]
+.  There was a bug in the handling of #-introduced comments, recognized when
+     PCRE_EXTENDED is set, when PCRE_NEWLINE_ANY and PCRE_UTF8 were also set.
+     If a UTF-8 multi-byte character included the byte 0x85 (e.g. +U0445, whose
+     UTF-8 encoding is 0xd1,0x85), this was misinterpreted as a newline when
+     scanning for the end of the comment. (*Character* 0x85 is an "any" newline,
+     but *byte* 0x85 is not, in UTF-8 mode). This bug was present in several
+     places in pcre_compile().
+.  Related to (6) above, when pcre_compile() was skipping #-introduced
+     comments when looking ahead for named forward references to subpatterns,
+     the only newline sequence it recognized was NL. It now handles newlines
+     according to the set newline convention.
+.  SunOS4 doesn't have strerror() or strtoul(); pcregrep dealt with the
+     former, but used strtoul(), whereas pcretest avoided strtoul() but did not
+     cater for a lack of strerror(). These oversights have been fixed.
+.  Added --match-limit and --recursion-limit to pcregrep.
+. Added two casts needed to build with Visual Studio when NO_RECURSE is set.
+. When the -o option was used, pcregrep was setting a return code of 1, even
+     when matches were found, and --line-buffered was not being honoured.
+. Added an optional parentheses number to the -o and --only-matching options
+     of pcregrep.
+. Imitating Perl's /g action for multiple matches is tricky when the pattern
+     can match an empty string. The code to do it in pcretest and pcredemo
+     needed fixing:
+     (a) When the newline convention was "crlf", pcretest got it wrong, skipping
+         only one byte after an empty string match just before CRLF (this case
+         just got forgotten; "any" and "anycrlf" were OK).
+     (b) The pcretest code also had a bug, causing it to loop forever in UTF-8
+         mode when an empty string match preceded an ASCII character followed by
+         a non-ASCII character. (The code for advancing by one character rather
+         than one byte was nonsense.)
+     (c) The pcredemo.c sample program did not have any code at all to handle
+         the cases when CRLF is a valid newline sequence.
+. Neither pcre_exec() nor pcre_dfa_exec() was checking that the value given
+     as a starting offset was within the subject string. There is now a new
+     error, PCRE_ERROR_BADOFFSET, which is returned if the starting offset is
+     negative or greater than the length of the string. In order to test this,
+     pcretest is extended to allow the setting of negative starting offsets.
+. In both pcre_exec() and pcre_dfa_exec() the code for checking that the
+     starting offset points to the beginning of a UTF-8 character was
+     unnecessarily clumsy. I tidied it up.
+. Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
+     bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
+. Nobody had reported that the --include_dir option, which was added in
+     release 7.7 should have been called --include-dir (hyphen, not underscore)
+     for compatibility with GNU grep. I have changed it to --include-dir, but
+     left --include_dir as an undocumented synonym, and the same for
+     --exclude-dir, though that is not available in GNU grep, at least as of
+     release 2.5.4.
+. At a user's suggestion, the macros GETCHAR and friends (which pick up UTF-8
+     characters from a string of bytes) have been redefined so as not to use
+     loops, in order to improve performance in some environments. At the same
+     time, I abstracted some of the common code into auxiliary macros to save
+     repetition (this should not affect the compiled code).
+. If \c was followed by a multibyte UTF-8 character, bad things happened. A
+     compile-time error is now given if \c is not followed by an ASCII
+     character, that is, a byte less than 128. (In EBCDIC mode, the code is
+     different, and any byte value is allowed.)
+. Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
+     START_OPTIMIZE option, which is now allowed at compile time - but just
+     passed through to pcre_exec() or pcre_dfa_exec(). This makes it available
+     to pcregrep and other applications that have no direct access to PCRE
+     options. The new /Y option in pcretest sets this option when calling
+     pcre_compile().
+. Change 18 of release 8.01 broke the use of named subpatterns for recursive
+     back references. Groups containing recursive back references were forced to
+     be atomic by that change, but in the case of named groups, the amount of
+     memory required was incorrectly computed, leading to "Failed: internal
+     error: code overflow". This has been fixed.
+. Some patches to pcre_stringpiece.h, pcre_stringpiece_unittest.cc, and
+     pcretest.c, to avoid build problems in some Borland environments.
+ Version 8.10 25-Jun-2010
+ ------------------------
+.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and
+     THEN.
+.  (*ACCEPT) was not working when inside an atomic group.
+.  Inside a character class, \B is treated as a literal by default, but
+     faulted if PCRE_EXTRA is set. This mimics Perl's behaviour (the -w option
+     causes the error). The code is unchanged, but I tidied the documentation.
+.  Inside a character class, PCRE always treated \R and \X as literals,
+     whereas Perl faults them if its -w option is set. I have changed PCRE so
+     that it faults them when PCRE_EXTRA is set.
+.  Added support for \N, which always matches any character other than
+     newline. (It is the same as "." when PCRE_DOTALL is not set.)
+.  When compiling pcregrep with newer versions of gcc which may have
+     FORTIFY_SOURCE set, several warnings "ignoring return value of 'fwrite',
+     declared with attribute warn_unused_result" were given. Just casting the
+     result to (void) does not stop the warnings; a more elaborate fudge is
+     needed. I've used a macro to implement this.
+.  Minor change to pcretest.c to avoid a compiler warning.
+.  Added four artifical Unicode properties to help with an option to make
+     \s etc use properties (see next item). The new properties are: Xan
+     (alphanumeric), Xsp (Perl space), Xps (POSIX space), and Xwd (word).
+.  Added PCRE_UCP to make \b, \d, \s, \w, and certain POSIX character classes
+     use Unicode properties. (*UCP) at the start of a pattern can be used to set
+     this option. Modified pcretest to add /W to test this facility. Added
+     REG_UCP to make it available via the POSIX interface.
+. Added --line-buffered to pcregrep.
+. In UTF-8 mode, if a pattern that was compiled with PCRE_CASELESS was
+     studied, and the match started with a letter with a code point greater than
+whose first byte was different to the first byte of the other case of
+     the letter, the other case of this starting letter was not recognized
+     (#976).
+. If a pattern that was studied started with a repeated Unicode property
+     test, for example, \p{Nd}+, there was the theoretical possibility of
+     setting up an incorrect bitmap of starting bytes, but fortunately it could
+     not have actually happened in practice until change 8 above was made (it
+     added property types that matched character-matching opcodes).
+. pcre_study() now recognizes \h, \v, and \R when constructing a bit map of
+     possible starting bytes for non-anchored patterns.
+. Extended the "auto-possessify" feature of pcre_compile(). It now recognizes
+     \R, and also a number of cases that involve Unicode properties, both
+     explicit and implicit when PCRE_UCP is set.
+. If a repeated Unicode property match (e.g. \p{Lu}*) was used with non-UTF-8
+     input, it could crash or give wrong results if characters with values
+     greater than 0xc0 were present in the subject string. (Detail: it assumed
+     UTF-8 input when processing these items.)
+. Added a lot of (int) casts to avoid compiler warnings in systems where
+     size_t is 64-bit (#991).
+. Added a check for running out of memory when PCRE is compiled with
+     --disable-stack-for-recursion (#990).
+. If the last data line in a file for pcretest does not have a newline on
+     the end, a newline was missing in the output.
+. The default pcre_chartables.c file recognizes only ASCII characters (values
+     less than 128) in its various bitmaps. However, there is a facility for
+     generating tables according to the current locale when PCRE is compiled. It
+     turns out that in some environments, 0x85 and 0xa0, which are Unicode space
+     characters, are recognized by isspace() and therefore were getting set in
+     these tables, and indeed these tables seem to approximate to ISO 8859. This
+     caused a problem in UTF-8 mode when pcre_study() was used to create a list
+     of bytes that can start a match. For \s, it was including 0x85 and 0xa0,
+     which of course cannot start UTF-8 characters. I have changed the code so
+     that only real ASCII characters (less than 128) and the correct starting
+     bytes for UTF-8 encodings are set for characters greater than 127 when in
+     UTF-8 mode. (When PCRE_UCP is set - see 9 above - the code is different
+     altogether.)
+. Added the /T option to pcretest so as to be able to run tests with non-
+     standard character tables, thus making it possible to include the tests
+     used for 19 above in the standard set of tests.
+. A pattern such as (?&t)(?#()(?(DEFINE)(?<t>a)) which has a forward
+     reference to a subpattern the other side of a comment that contains an
+     opening parenthesis caused either an internal compiling error, or a
+     reference to the wrong subpattern.
+ Version 8.02 19-Mar-2010
+ ------------------------
+.  The Unicode data tables have been updated to Unicode 5.2.0.
+.  Added the option --libs-cpp to pcre-config, but only when C++ support is
+     configured.
+.  Updated the licensing terms in the pcregexp.pas file, as agreed with the
+     original author of that file, following a query about its status.
+.  On systems that do not have stdint.h (e.g. Solaris), check for and include
+     inttypes.h instead. This fixes a bug that was introduced by change 8.01/8.
+.  A pattern such as (?&t)*+(?(DEFINE)(?<t>.)) which has a possessive
+     quantifier applied to a forward-referencing subroutine call, could compile
+     incorrect code or give the error "internal error: previously-checked
+     referenced subpattern not found".
+.  Both MS Visual Studio and Symbian OS have problems with initializing
+     variables to point to external functions. For these systems, therefore,
+     pcre_malloc etc. are now initialized to local functions that call the
+     relevant global functions.
+.  There were two entries missing in the vectors called coptable and poptable
+     in pcre_dfa_exec.c. This could lead to memory accesses outsize the vectors.
+     I've fixed the data, and added a kludgy way of testing at compile time that
+     the lengths are correct (equal to the number of opcodes).
+.  Following on from 7, I added a similar kludge to check the length of the
+     eint vector in pcreposix.c.
+.  Error texts for pcre_compile() are held as one long string to avoid too
+     much relocation at load time. To find a text, the string is searched,
+     counting zeros. There was no check for running off the end of the string,
+     which could happen if a new error number was added without updating the
+     string.
+. \K gave a compile-time error if it appeared in a lookbehind assersion.
+. \K was not working if it appeared in an atomic group or in a group that
+     was called as a "subroutine", or in an assertion. Perl 5.11 documents that
+     \K is "not well defined" if used in an assertion. PCRE now accepts it if
+     the assertion is positive, but not if it is negative.
+. Change 11 fortuitously reduced the size of the stack frame used in the
+     "match()" function of pcre_exec.c by one pointer. Forthcoming
+     implementation of support for (*MARK) will need an extra pointer on the
+     stack; I have reserved it now, so that the stack frame size does not
+     decrease.
+. A pattern such as (?P<L1>(?P<L2>0)|(?P>L2)(?P>L1)) in which the only other
+     item in branch that calls a recursion is a subroutine call - as in the
+     second branch in the above example - was incorrectly given the compile-
+     time error "recursive call could loop indefinitely" because pcre_compile()
+     was not correctly checking the subroutine for matching a non-empty string.
+. The checks for overrunning compiling workspace could trigger after an
+     overrun had occurred. This is a "should never occur" error, but it can be
+     triggered by pathological patterns such as hundreds of nested parentheses.
+     The checks now trigger 100 bytes before the end of the workspace.
+. Fix typo in configure.ac: "srtoq" should be "strtoq".
+ Version 8.01 19-Jan-2010
+ ------------------------
+.  If a pattern contained a conditional subpattern with only one branch (in
+     particular, this includes all (*DEFINE) patterns), a call to pcre_study()
+     computed the wrong minimum data length (which is of course zero for such
+     subpatterns). This could cause incorrect "no match" results.
+.  For patterns such as (?i)a(?-i)b|c where an option setting at the start of
+     the pattern is reset in the first branch, pcre_compile() failed with
+     "internal error: code overflow at offset...". This happened only when
+     the reset was to the original external option setting. (An optimization
+     abstracts leading options settings into an external setting, which was the
+     cause of this.)
+.  A pattern such as ^(?!a(*SKIP)b) where a negative assertion contained one
+     of the verbs SKIP, PRUNE, or COMMIT, did not work correctly. When the
+     assertion pattern did not match (meaning that the assertion was true), it
+     was incorrectly treated as false if the SKIP had been reached during the
+     matching. This also applied to assertions used as conditions.
+.  If an item that is not supported by pcre_dfa_exec() was encountered in an
+     assertion subpattern, including such a pattern used as a condition,
+     unpredictable results occurred, instead of the error return
+     PCRE_ERROR_DFA_UITEM.
+.  The C++ GlobalReplace function was not working like Perl for the special
+     situation when an empty string is matched. It now does the fancy magic
+     stuff that is necessary.
+.  In pcre_internal.h, obsolete includes to setjmp.h and stdarg.h have been
+     removed. (These were left over from very, very early versions of PCRE.)
+.  Some cosmetic changes to the code to make life easier when compiling it
+     as part of something else:
+     (a) Change DEBUG to PCRE_DEBUG.
+     (b) In pcre_compile(), rename the member of the "branch_chain" structure
+         called "current" as "current_branch", to prevent a collision with the
+         Linux macro when compiled as a kernel module.
+     (c) In pcre_study(), rename the function set_bit() as set_table_bit(), to
+         prevent a collision with the Linux macro when compiled as a kernel
+         module.
+.  In pcre_compile() there are some checks for integer overflows that used to
+     cast potentially large values to (double). This has been changed to that
+     when building, a check for int64_t is made, and if it is found, it is used
+     instead, thus avoiding the use of floating point arithmetic. (There is no
+     other use of FP in PCRE.) If int64_t is not found, the fallback is to
+     double.
+.  Added two casts to avoid signed/unsigned warnings from VS Studio Express
+(difference between two addresses compared to an unsigned value).
+. Change the standard AC_CHECK_LIB test for libbz2 in configure.ac to a
+     custom one, because of the following reported problem in Windows:
+       - libbz2 uses the Pascal calling convention (WINAPI) for the functions
+           under Win32.
+       - The standard autoconf AC_CHECK_LIB fails to include "bzlib.h",
+           therefore missing the function definition.
+       - The compiler thus generates a "C" signature for the test function.
+       - The linker fails to find the "C" function.
+       - PCRE fails to configure if asked to do so against libbz2.
+. When running libtoolize from libtool-2.2.6b as part of autogen.sh, these
+     messages were output:
+       Consider adding `AC_CONFIG_MACRO_DIR([m4])' to configure.ac and
+       rerunning libtoolize, to keep the correct libtool macros in-tree.
+       Consider adding `-I m4' to ACLOCAL_AMFLAGS in Makefile.am.
+     I have done both of these things.
+. Although pcre_dfa_exec() does not use nearly as much stack as pcre_exec()
+     most of the time, it *can* run out if it is given a pattern that contains a
+     runaway infinite recursion. I updated the discussion in the pcrestack man
+     page.
+. Now that we have gone to the x.xx style of version numbers, the minor
+     version may start with zero. Using 08 or 09 is a bad idea because users
+     might check the value of PCRE_MINOR in their code, and 08 or 09 may be
+     interpreted as invalid octal numbers. I've updated the previous comment in
+     configure.ac, and also added a check that gives an error if 08 or 09 are
+     used.
+. Change 8.00/11 was not quite complete: code had been accidentally omitted,
+     causing partial matching to fail when the end of the subject matched \W
+     in a UTF-8 pattern where \W was quantified with a minimum of 3.
+. There were some discrepancies between the declarations in pcre_internal.h
+     of _pcre_is_newline(), _pcre_was_newline(), and _pcre_valid_utf8() and
+     their definitions. The declarations used "const uschar *" and the
+     definitions used USPTR. Even though USPTR is normally defined as "const
+     unsigned char *" (and uschar is typedeffed as "unsigned char"), it was
+     reported that: "This difference in casting confuses some C++ compilers, for
+     example, SunCC recognizes above declarations as different functions and
+     generates broken code for hbpcre." I have changed the declarations to use
+     USPTR.
+. GNU libtool is named differently on some systems. The autogen.sh script now
+     tries several variants such as glibtoolize (MacOSX) and libtoolize1x
+     (FreeBSD).
+. Applied Craig's patch that fixes an HP aCC compile error in pcre 8.00
+     (strtoXX undefined when compiling pcrecpp.cc). The patch contains this
+     comment: "Figure out how to create a longlong from a string: strtoll and
+     equivalent. It's not enough to call AC_CHECK_FUNCS: hpux has a strtoll, for
+     instance, but it only takes 2 args instead of 3!"
+. A subtle bug concerned with back references has been fixed by a change of
+     specification, with a corresponding code fix. A pattern such as
+     ^(xa|=?\1a)+$ which contains a back reference inside the group to which it
+     refers, was giving matches when it shouldn't. For example, xa=xaaa would
+     match that pattern. Interestingly, Perl (at least up to 5.11.3) has the
+     same bug. Such groups have to be quantified to be useful, or contained
+     inside another quantified group. (If there's no repetition, the reference
+     can never match.) The problem arises because, having left the group and
+     moved on to the rest of the pattern, a later failure that backtracks into
+     the group uses the captured value from the final iteration of the group
+     rather than the correct earlier one. I have fixed this in PCRE by forcing
+     any group that contains a reference to itself to be an atomic group; that
+     is, there cannot be any backtracking into it once it has completed. This is
+     similar to recursive and subroutine calls.
+ Version 8.00 19-Oct-09
+ ----------------------
+.  The table for translating pcre_compile() error codes into POSIX error codes
+     was out-of-date, and there was no check on the pcre_compile() error code
+     being within the table. This could lead to an OK return being given in
+     error.
+.  Changed the call to open a subject file in pcregrep from fopen(pathname,
+     "r") to fopen(pathname, "rb"), which fixed a problem with some of the tests
+     in a Windows environment.
+.  The pcregrep --count option prints the count for each file even when it is
+     zero, as does GNU grep. However, pcregrep was also printing all files when
+     --files-with-matches was added. Now, when both options are given, it prints
+     counts only for those files that have at least one match. (GNU grep just
+     prints the file name in this circumstance, but including the count seems
+     more useful - otherwise, why use --count?) Also ensured that the
+     combination -clh just lists non-zero counts, with no names.
+.  The long form of the pcregrep -F option was incorrectly implemented as
+     --fixed_strings instead of --fixed-strings. This is an incompatible change,
+     but it seems right to fix it, and I didn't think it was worth preserving
+     the old behaviour.
+.  The command line items --regex=pattern and --regexp=pattern were not
+     recognized by pcregrep, which required --regex pattern or --regexp pattern
+     (with a space rather than an '='). The man page documented the '=' forms,
+     which are compatible with GNU grep; these now work.
+.  No libpcreposix.pc file was created for pkg-config; there was just
+     libpcre.pc and libpcrecpp.pc. The omission has been rectified.
+.  Added #ifndef SUPPORT_UCP into the pcre_ucd.c module, to reduce its size
+     when UCP support is not needed, by modifying the Python script that
+     generates it from Unicode data files. This should not matter if the module
+     is correctly used as a library, but I received one complaint about 50K of
+     unwanted data. My guess is that the person linked everything into his
+     program rather than using a library. Anyway, it does no harm.
+.  A pattern such as /\x{123}{2,2}+/8 was incorrectly compiled; the trigger
+     was a minimum greater than 1 for a wide character in a possessive
+     repetition. The same bug could also affect patterns like /(\x{ff}{0,2})*/8
+     which had an unlimited repeat of a nested, fixed maximum repeat of a wide
+     character. Chaos in the form of incorrect output or a compiling loop could
+     result.
+.  The restrictions on what a pattern can contain when partial matching is
+     requested for pcre_exec() have been removed. All patterns can now be
+     partially matched by this function. In addition, if there are at least two
+     slots in the offset vector, the offset of the earliest inspected character
+     for the match and the offset of the end of the subject are set in them when
+     PCRE_ERROR_PARTIAL is returned.
+. Partial matching has been split into two forms: PCRE_PARTIAL_SOFT, which is
+     synonymous with PCRE_PARTIAL, for backwards compatibility, and
+     PCRE_PARTIAL_HARD, which causes a partial match to supersede a full match,
+     and may be more useful for multi-segment matching.
+. Partial matching with pcre_exec() is now more intuitive. A partial match
+     used to be given if ever the end of the subject was reached; now it is
+     given only if matching could not proceed because another character was
+     needed. This makes a difference in some odd cases such as Z(*FAIL) with the
+     string "Z", which now yields "no match" instead of "partial match". In the
+     case of pcre_dfa_exec(), "no match" is given if every matching path for the
+     final character ended with (*FAIL).
+. Restarting a match using pcre_dfa_exec() after a partial match did not work
+     if the pattern had a "must contain" character that was already found in the
+     earlier partial match, unless partial matching was again requested. For
+     example, with the pattern /dog.(body)?/, the "must contain" character is
+     "g". If the first part-match was for the string "dog", restarting with
+     "sbody" failed. This bug has been fixed.
+. The string returned by pcre_dfa_exec() after a partial match has been
+     changed so that it starts at the first inspected character rather than the
+     first character of the match. This makes a difference only if the pattern
+     starts with a lookbehind assertion or \b or \B (\K is not supported by
+     pcre_dfa_exec()). It's an incompatible change, but it makes the two
+     matching functions compatible, and I think it's the right thing to do.
+. Added a pcredemo man page, created automatically from the pcredemo.c file,
+     so that the demonstration program is easily available in environments where
+     PCRE has not been installed from source.
+. Arranged to add -DPCRE_STATIC to cflags in libpcre.pc, libpcreposix.cp,
+     libpcrecpp.pc and pcre-config when PCRE is not compiled as a shared
+     library.
+. Added REG_UNGREEDY to the pcreposix interface, at the request of a user.
+     It maps to PCRE_UNGREEDY. It is not, of course, POSIX-compatible, but it
+     is not the first non-POSIX option to be added. Clearly some people find
+     these options useful.
+. If a caller to the POSIX matching function regexec() passes a non-zero
+     value for nmatch with a NULL value for pmatch, the value of
+     nmatch is forced to zero.
+. RunGrepTest did not have a test for the availability of the -u option of
+     the diff command, as RunTest does. It now checks in the same way as
+     RunTest, and also checks for the -b option.
+. If an odd number of negated classes containing just a single character
+     interposed, within parentheses, between a forward reference to a named
+     subpattern and the definition of the subpattern, compilation crashed with
+     an internal error, complaining that it could not find the referenced
+     subpattern. An example of a crashing pattern is /(?&A)(([^m])(?<A>))/.
+     [The bug was that it was starting one character too far in when skipping
+     over the character class, thus treating the ] as data rather than
+     terminating the class. This meant it could skip too much.]
+. Added PCRE_NOTEMPTY_ATSTART in order to be able to correctly implement the
+     /g option in pcretest when the pattern contains \K, which makes it possible
+     to have an empty string match not at the start, even when the pattern is
+     anchored. Updated pcretest and pcredemo to use this option.
+. If the maximum number of capturing subpatterns in a recursion was greater
+     than the maximum at the outer level, the higher number was returned, but
+     with unset values at the outer level. The correct (outer level) value is
+     now given.
+. If (*ACCEPT) appeared inside capturing parentheses, previous releases of
+     PCRE did not set those parentheses (unlike Perl). I have now found a way to
+     make it do so. The string so far is captured, making this feature
+     compatible with Perl.
+. The tests have been re-organized, adding tests 11 and 12, to make it
+     possible to check the Perl 5.10 features against Perl 5.10.
+. Perl 5.10 allows subroutine calls in lookbehinds, as long as the subroutine
+     pattern matches a fixed length string. PCRE did not allow this; now it
+     does. Neither allows recursion.
+. I finally figured out how to implement a request to provide the minimum
+     length of subject string that was needed in order to match a given pattern.
+     (It was back references and recursion that I had previously got hung up
+     on.) This code has now been added to pcre_study(); it finds a lower bound
+     to the length of subject needed. It is not necessarily the greatest lower
+     bound, but using it to avoid searching strings that are too short does give
+     some useful speed-ups. The value is available to calling programs via
+     pcre_fullinfo().
+. While implementing 25, I discovered to my embarrassment that pcretest had
+     not been passing the result of pcre_study() to pcre_dfa_exec(), so the
+     study optimizations had never been tested with that matching function.
+     Oops. What is worse, even when it was passed study data, there was a bug in
+     pcre_dfa_exec() that meant it never actually used it. Double oops. There
+     were also very few tests of studied patterns with pcre_dfa_exec().
+. If (?| is used to create subpatterns with duplicate numbers, they are now
+     allowed to have the same name, even if PCRE_DUPNAMES is not set. However,
+     on the other side of the coin, they are no longer allowed to have different
+     names, because these cannot be distinguished in PCRE, and this has caused
+     confusion. (This is a difference from Perl.)
+. When duplicate subpattern names are present (necessarily with different
+     numbers, as required by 27 above), and a test is made by name in a
+     conditional pattern, either for a subpattern having been matched, or for
+     recursion in such a pattern, all the associated numbered subpatterns are
+     tested, and the overall condition is true if the condition is true for any
+     one of them. This is the way Perl works, and is also more like the way
+     testing by number works.
+ Version 7.9 11-Apr-09
+ ---------------------
+.  When building with support for bzlib/zlib (pcregrep) and/or readline
+     (pcretest), all targets were linked against these libraries. This included
+     libpcre, libpcreposix, and libpcrecpp, even though they do not use these
+     libraries. This caused unwanted dependencies to be created. This problem
+     has been fixed, and now only pcregrep is linked with bzlib/zlib and only
+     pcretest is linked with readline.
+.  The "typedef int BOOL" in pcre_internal.h that was included inside the
+     "#ifndef FALSE" condition by an earlier change (probably 7.8/18) has been
+     moved outside it again, because FALSE and TRUE are already defined in AIX,
+     but BOOL is not.
+.  The pcre_config() function was treating the PCRE_MATCH_LIMIT and
+     PCRE_MATCH_LIMIT_RECURSION values as ints, when they should be long ints.
+.  The pcregrep documentation said spaces were inserted as well as colons (or
+     hyphens) following file names and line numbers when outputting matching
+     lines. This is not true; no spaces are inserted. I have also clarified the
+     wording for the --colour (or --color) option.
+.  In pcregrep, when --colour was used with -o, the list of matching strings
+     was not coloured; this is different to GNU grep, so I have changed it to be
+     the same.
+.  When --colo(u)r was used in pcregrep, only the first matching substring in
+     each matching line was coloured. Now it goes on to look for further matches
+     of any of the test patterns, which is the same behaviour as GNU grep.
+.  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
+     locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
+     seems to be how GNU grep behaves.
+.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
+     start or after a newline", because the conditional assertion was not being
+     correctly handled. The rule now is that both the assertion and what follows
+     in the first alternative must satisfy the test.
+.  If auto-callout was enabled in a pattern with a conditional group whose
+     condition was an assertion, PCRE could crash during matching, both with
+     pcre_exec() and pcre_dfa_exec().
+. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
+     used for matching.
+. Unicode property support in character classes was not working for
+     characters (bytes) greater than 127 when not in UTF-8 mode.
+. Added the -M command line option to pcretest.
+. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
+. Added the PCRE_NO_START_OPTIMIZE match-time option.
+. Added comments and documentation about mis-use of no_arg in the C++
+     wrapper.
+. Implemented support for UTF-8 encoding in EBCDIC environments, a patch
+     from Martin Jerabek that uses macro names for all relevant character and
+     string constants.
+. Added to pcre_internal.h two configuration checks: (a) If both EBCDIC and
+     SUPPORT_UTF8 are set, give an error; (b) If SUPPORT_UCP is set without
+     SUPPORT_UTF8, define SUPPORT_UTF8. The "configure" script handles both of
+     these, but not everybody uses configure.
+. A conditional group that had only one branch was not being correctly
+     recognized as an item that could match an empty string. This meant that an
+     enclosing group might also not be so recognized, causing infinite looping
+     (and probably a segfault) for patterns such as ^"((?(?=[a])[^"])|b)*"$
+     with the subject "ab", where knowledge that the repeated group can match
+     nothing is needed in order to break the loop.
+. If a pattern that was compiled with callouts was matched using pcre_dfa_
+     exec(), but without supplying a callout function, matching went wrong.
+. If PCRE_ERROR_MATCHLIMIT occurred during a recursion, there was a memory
+     leak if the size of the offset vector was greater than 30. When the vector
+     is smaller, the saved offsets during recursion go onto a local stack
+     vector, but for larger vectors malloc() is used. It was failing to free
+     when the recursion yielded PCRE_ERROR_MATCH_LIMIT (or any other "abnormal"
+     error, in fact).
+. There was a missing #ifdef SUPPORT_UTF8 round one of the variables in the
+     heapframe that is used only when UTF-8 support is enabled. This caused no
+     problem, but was untidy.
+. Steven Van Ingelgem's patch to CMakeLists.txt to change the name
+     CMAKE_BINARY_DIR to PROJECT_BINARY_DIR so that it works when PCRE is
+     included within another project.
+. Steven Van Ingelgem's patches to add more options to the CMake support,
+     slightly modified by me:
+       (a) PCRE_BUILD_TESTS can be set OFF not to build the tests, including
+           not building pcregrep.
+       (b) PCRE_BUILD_PCREGREP can be see OFF not to build pcregrep, but only
+           if PCRE_BUILD_TESTS is also set OFF, because the tests use pcregrep.
+. Forward references, both numeric and by name, in patterns that made use of
+     duplicate group numbers, could behave incorrectly or give incorrect errors,
+     because when scanning forward to find the reference group, PCRE was not
+     taking into account the duplicate group numbers. A pattern such as
+     ^X(?3)(a)(?|(b)|(q))(Y) is an example.
+. Changed a few more instances of "const unsigned char *" to USPTR, making
+     the feature of a custom pointer more persuasive (as requested by a user).
+. Wrapped the definitions of fileno and isatty for Windows, which appear in
+     pcretest.c, inside #ifndefs, because it seems they are sometimes already
+     pre-defined.
+. Added support for (*UTF8) at the start of a pattern.
+. Arrange for flags added by the "release type" setting in CMake to be shown
+     in the configuration summary.
+ Version 7.8 05-Sep-08
+ ---------------------
+.  Replaced UCP searching code with optimized version as implemented for Ad
+     Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
+     stage table and inline lookup instead of a function, giving speed ups of 2
+     to 5 times on some simple patterns that I tested. Permission was given to
+     distribute the MultiStage2.py script that generates the tables (it's not in
+     the tarball, but is in the Subversion repository).
+.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
+     scripts.
+.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
+     a group with a zero qualifier. The result of the study could be incorrect,
+     or the function might crash, depending on the pattern.
+.  Caseless matching was not working for non-ASCII characters in back
+     references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
+     It now works when Unicode Property Support is available.
+.  In pcretest, an escape such as \x{de} in the data was always generating
+     a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
+     non-UTF-8 mode. If the value is greater than 255, it gives a warning about
+     truncation.
+.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
+.  Added two (int) casts to pcregrep when printing the difference of two
+     pointers, in case they are 64-bit values.
+.  Added comments about Mac OS X stack usage to the pcrestack man page and to
+     test 2 if it fails.
+.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
+     and a #define of that name to empty if it is not externally set. This is to
+     allow users of MSVC to set it if necessary.
+. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
+     the convenience functions in the pcre_get.c source file.
+. An option change at the start of a pattern that had top-level alternatives
+     could cause overwriting and/or a crash. This command provoked a crash in
+     some environments:
+       printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
+     This potential security problem was recorded as CVE-2008-2371.
+. For a pattern where the match had to start at the beginning or immediately
+     after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
+     pcre_dfa_exec() could read past the end of the passed subject if there was
+     no match. To help with detecting such bugs (e.g. with valgrind), I modified
+     pcretest so that it places the subject at the end of its malloc-ed buffer.
+. The change to pcretest in 12 above threw up a couple more cases when pcre_
+     exec() might read past the end of the data buffer in UTF-8 mode.
+. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
+     the data contained the byte 0x85 as part of a UTF-8 character within its
+     first line. This applied both to normal and DFA matching.
+. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
+     /^[^d]*?$/8 failed to match "abc".
+. Added a missing copyright notice to pcrecpp_internal.h.
+. Make it more clear in the documentation that values returned from
+     pcre_exec() in ovector are byte offsets, not character counts.
+. Tidied a few places to stop certain compilers from issuing warnings.
+. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
+     supplied by Stefan Weber. I made a further small update for 7.8 because
+     there is a change of source arrangements: the pcre_searchfuncs.c module is
+     replaced by pcre_ucd.c.
+ Version 7.7 07-May-08
+ ---------------------
+.  Applied Craig's patch to sort out a long long problem: "If we can't convert
+     a string to a long long, pretend we don't even have a long long." This is
+     done by checking for the strtoq, strtoll, and _strtoi64 functions.
+.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
+     pre-7.6 versions, which defined a global no_arg variable instead of putting
+     it in the RE class. (See also #8 below.)
+.  Remove a line of dead code, identified by coverity and reported by Nuno
+     Lopes.
+.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
+     (1) The include/exclude patterns were being applied to the whole pathnames
+         of files, instead of just to the final components.
+     (2) If there was more than one level of directory, the subdirectories were
+         skipped unless they satisfied the include/exclude conditions. This is
+         inconsistent with GNU grep (and could even be seen as contrary to the
+         pcregrep specification - which I improved to make it absolutely clear).
+         The action now is always to scan all levels of directory, and just
+         apply the include/exclude patterns to regular files.
+.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
+     --exclude_dir in the tests to avoid scanning .svn directories.
+.  Applied Craig's patch to the QuoteMeta function so that it escapes the
+     NUL character as backslash + 0 rather than backslash + NUL, because PCRE
+     doesn't support NULs in patterns.
+.  Added some missing "const"s to declarations of static tables in
+     pcre_compile.c and pcre_dfa_exec.c.
+.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
+     caused by fix #2  above. (Subsequently also a second patch to fix the
+     first patch. And a third patch - this was a messy problem.)
+.  Applied Craig's patch to remove the use of push_back().
+. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
+     matching function regexec().
+. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
+     which, however, unlike Perl's \g{...}, are subroutine calls, not back
+     references. PCRE supports relative numbers with this syntax (I don't think
+     Oniguruma does).
+. Previously, a group with a zero repeat such as (...){0} was completely
+     omitted from the compiled regex. However, this means that if the group
+     was called as a subroutine from elsewhere in the pattern, things went wrong
+     (an internal error was given). Such groups are now left in the compiled
+     pattern, with a new opcode that causes them to be skipped at execution
+     time.
+. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
+     to the way PCRE behaves:
+     (a) A lone ] character is dis-allowed (Perl treats it as data).
+     (b) A back reference to an unmatched subpattern matches an empty string
+         (Perl fails the current match path).
+     (c) A data ] in a character class must be notated as \] because if the
+         first data character in a class is ], it defines an empty class. (In
+         Perl it is not possible to have an empty class.) The empty class []
+         never matches; it forces failure and is equivalent to (*FAIL) or (?!).
+         The negative empty class [^] matches any one character, independently
+         of the DOTALL setting.
+. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
+     non-existent subpattern following a character class starting with ']' and
+     containing () gave an internal compiling error instead of "reference to
+     non-existent subpattern". Fortunately, when the pattern did exist, the
+     compiled code was correct. (When scanning forwards to check for the
+     existencd of the subpattern, it was treating the data ']' as terminating
+     the class, so got the count wrong. When actually compiling, the reference
+     was subsequently set up correctly.)
+. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
+     it was being rejected as not supported by pcre_dfa_exec(), even though
+     other assertions are supported. I have made pcre_dfa_exec() support
+     (*FAIL).
+. The implementation of 13c above involved the invention of a new opcode,
+     OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
+     cannot be changed at match time, I realized I could make a small
+     improvement to matching performance by compiling OP_ALLANY instead of
+     OP_ANY for "." when DOTALL was set, and then removing the runtime tests
+     on the OP_ANY path.
+. Compiling pcretest on Windows with readline support failed without the
+     following two fixes: (1) Make the unistd.h include conditional on
+     HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
+. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
+     ncurses library to be included for pcretest when ReadLine support is
+     requested, but also to allow for it to be overridden. This patch came from
+     Daniel Bergstr�m.
+. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
+     as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
+     any errors with the current Unicode tables. Thanks to Peter Kankowski for
+     spotting this.
+ Version 7.6 28-Jan-08
+ ---------------------
+.  A character class containing a very large number of characters with
+     codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
+     overflow.
+.  Patch to cut out the "long long" test in pcrecpp_unittest when
+     HAVE_LONG_LONG is not defined.
+.  Applied Christian Ehrlicher's patch to update the CMake build files to
+     bring them up to date and include new features. This patch includes:
+     - Fixed PH's badly added libz and libbz2 support.
+     - Fixed a problem with static linking.
+     - Added pcredemo. [But later removed - see 7 below.]
+     - Fixed dftables problem and added an option.
+     - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
+         HAVE_LONG_LONG.
+     - Added readline support for pcretest.
+     - Added an listing of the option settings after cmake has run.
+.  A user submitted a patch to Makefile that makes it easy to create
+     "pcre.dll" under mingw when using Configure/Make. I added stuff to
+     Makefile.am that cause it to include this special target, without
+     affecting anything else. Note that the same mingw target plus all
+     the other distribution libraries and programs are now supported
+     when configuring with CMake (see 6 below) instead of with
+     Configure/Make.
+.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
+     This is an attempt to solve the reported problem "pcrecpp::no_arg is not
+     exported in the Windows port". It has not yet been confirmed that the patch
+     solves the problem, but it does no harm.
+.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
+     NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
+     with CMake, and also correct the comment about stack recursion.
+.  Remove the automatic building of pcredemo from the ./configure system and
+     from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
+     of a program that users should build themselves after PCRE is installed, so
+     building it automatically is not really right. What is more, it gave
+     trouble in some build environments.
+.  Further tidies to CMakeLists.txt from Sheri and Christian.
+ Version 7.5 10-Jan-08
  ---------------------
 .  Applied a patch from Craig: "This patch makes it possible to 'ignore'
      values in parens when parsing an RE using the C++ wrapper."
 .  Negative specials like \S did not work in character classes in UTF-8 mode.
      Characters greater than 255 were excluded from the class instead of being
      included.
 .  The same bug as (2) above applied to negated POSIX classes such as
      [:^space:].
 .  PCRECPP_STATIC was referenced in pcrecpp_internal.h, but nowhere was it
      defined or documented. It seems to have been a typo for PCRE_STATIC, so
      I have changed it.
 .  The construct (?&) was not diagnosed as a syntax error (it referenced the
      first named subpattern) and a construct such as (?&a) would reference the
      first named subpattern whose name started with "a" (in other words, the
      length check was missing). Both these problems are fixed. "Subpattern name
      expected" is now given for (?&) (a zero-length name), and this patch also
      makes it give the same error for \k'' (previously it complained that that
      was a reference to a non-existent subpattern).
 .  The erroneous patterns (?+-a) and (?-+a) give different error messages;
      this is right because (?- can be followed by option settings as well as by
      digits. I have, however, made the messages clearer.
 .  Patterns such as (?(1)a|b) (a pattern that contains fewer subpatterns
      than the number used in the conditional) now cause a compile-time error.
      This is actually not compatible with Perl, which accepts such patterns, but
      treats the conditional as always being FALSE (as PCRE used to), but it
      seems to me that giving a diagnostic is better.
 .  Change "alphameric" to the more common word "alphanumeric" in comments
      and messages.
 .  Fix two occurrences of "backslash" in comments that should have been
      "backspace".
 . Remove two redundant lines of code that can never be obeyed (their function
      was moved elsewhere).
 . The program that makes PCRE's Unicode character property table had a bug
      which caused it to generate incorrect table entries for sequences of
      characters that have the same character type, but are in different scripts.
      It amalgamated them into a single range, with the script of the first of
      them. In other words, some characters were in the wrong script. There were
      thirteen such cases, affecting characters in the following ranges:
        U+002b0 - U+002c1
        U+0060c - U+0060d
        U+0061e - U+00612
        U+0064b - U+0065e
        U+0074d - U+0076d
        U+01800 - U+01805
-Line 65 
 Version 7.5 12-Nov-07
+Line 1037 
 Version 7.5 12-Nov-07
        U+03260 - U+0327f
        U+0fb46 - U+0fbb1
        U+10450 - U+1049d
 . The -o option (show only the matching part of a line) for pcregrep was not
      compatible with GNU grep in that, if there was more than one match in a
      line, it showed only the first of them. It now behaves in the same way as
      GNU grep.
 . If the -o and -v options were combined for pcregrep, it printed a blank
      line for every non-matching line. GNU grep prints nothing, and pcregrep now
      does the same. The return code can be used to tell if there were any
      non-matching lines.
+. Added --file-offsets and --line-offsets to pcregrep.
+. The pattern (?=something)(?R) was not being diagnosed as a potentially
+     infinitely looping recursion. The bug was that positive lookaheads were not
+     being skipped when checking for a possible empty match (negative lookaheads
+     and both kinds of lookbehind were skipped).
+. Fixed two typos in the Windows-only code in pcregrep.c, and moved the
+     inclusion of <windows.h> to before rather than after the definition of
+     INVALID_FILE_ATTRIBUTES (patch from David Byron).
+. Specifying a possessive quantifier with a specific limit for a Unicode
+     character property caused pcre_compile() to compile bad code, which led at
+     runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this
+     are: /\p{Zl}{2,3}+/8 and /\p{Cc}{2}+/8. It was the possessive "+" that
+     caused the error; without that there was no problem.
+. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.
+. Added --enable-pcretest-libreadline.
+. In pcrecpp.cc, the variable 'count' was incremented twice in
+     RE::GlobalReplace(). As a result, the number of replacements returned was
+     double what it should be. I removed one of the increments, but Craig sent a
+     later patch that removed the other one (the right fix) and added unit tests
+     that check the return values (which was not done before).
+. Several CMake things:
+     (1) Arranged that, when cmake is used on Unix, the libraries end up with
+         the names libpcre and libpcreposix, not just pcre and pcreposix.
+     (2) The above change means that pcretest and pcregrep are now correctly
+         linked with the newly-built libraries, not previously installed ones.
+     (3) Added PCRE_SUPPORT_LIBREADLINE, PCRE_SUPPORT_LIBZ, PCRE_SUPPORT_LIBBZ2.
+. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
+     crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
+     UTF-8 newline character). The key issue is that the pattern starts .*;
+     this means that the match must be either at the beginning, or after a
+     newline. The bug was in the code for advancing after a failed match and
+     checking that the new position followed a newline. It was not taking
+     account of UTF-8 characters correctly.
+. PCRE was behaving differently from Perl in the way it recognized POSIX
+     character classes. PCRE was not treating the sequence [:...:] as a
+     character class unless the ... were all letters. Perl, however, seems to
+     allow any characters between [: and :], though of course it rejects as
+     unknown any "names" that contain non-letters, because all the known class
+     names consist only of letters. Thus, Perl gives an error for [[:1234:]],
+     for example, whereas PCRE did not - it did not recognize a POSIX character
+     class. This seemed a bit dangerous, so the code has been changed to be
+     closer to Perl. The behaviour is not identical to Perl, because PCRE will
+     diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
+     treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
+     Perl does, and where it didn't before.
+. Rewrite so as to remove the single use of %n from pcregrep because in some
+     Windows environments %n is disabled by default.
  Version 7.4 21-Sep-07

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