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    1 News about PCRE releases
    2 ------------------------
    4 Release 8.30 04-February-2012
    5 -----------------------------
    7 Release 8.30 introduces a major new feature: support for 16-bit character
    8 strings, compiled as a separate library. There are a few changes to the
    9 8-bit library, in addition to some bug fixes.
   11 . The pcre_info() function, which has been obsolete for over 10 years, has
   12   been removed.
   14 . When a compiled pattern was saved to a file and later reloaded on a host
   15   with different endianness, PCRE used automatically to swap the bytes in some
   16   of the data fields. With the advent of the 16-bit library, where more of this
   17   swapping is needed, it is no longer done automatically. Instead, the bad
   18   endianness is detected and a specific error is given. The user can then call
   19   a new function called pcre_pattern_to_host_byte_order() (or an equivalent
   20   16-bit function) to do the swap.
   22 . In UTF-8 mode, the values 0xd800 to 0xdfff are not legal Unicode
   23   code points and are now faulted. (They are the so-called "surrogates"
   24   that are reserved for coding high values in UTF-16.)
   27 Release 8.21 12-Dec-2011
   28 ------------------------
   30 This is almost entirely a bug-fix release. The only new feature is the ability
   31 to obtain the size of the memory used by the JIT compiler.
   34 Release 8.20 21-Oct-2011
   35 ------------------------
   37 The main change in this release is the inclusion of Zoltan Herczeg's
   38 just-in-time compiler support, which can be accessed by building PCRE with
   39 --enable-jit. Large performance benefits can be had in many situations. 8.20
   40 also fixes an unfortunate bug that was introduced in 8.13 as well as tidying up
   41 a number of infelicities and differences from Perl.
   44 Release 8.13 16-Aug-2011
   45 ------------------------
   47 This is mainly a bug-fix release. There has been a lot of internal refactoring.
   48 The Unicode tables have been updated. The only new feature in the library is
   49 the passing of *MARK information to callouts. Some additions have been made to
   50 pcretest to make testing easier and more comprehensive. There is a new option
   51 for pcregrep to adjust its internal buffer size.
   54 Release 8.12 15-Jan-2011
   55 ------------------------
   57 This release fixes some bugs in pcregrep, one of which caused the tests to fail
   58 on 64-bit big-endian systems. There are no changes to the code of the library.
   61 Release 8.11 10-Dec-2010
   62 ------------------------
   64 A number of bugs in the library and in pcregrep have been fixed. As always, see
   65 ChangeLog for details. The following are the non-bug-fix changes:
   67 . Added --match-limit and --recursion-limit to pcregrep.
   69 . Added an optional parentheses number to the -o and --only-matching options
   70   of pcregrep.
   72 . Changed the way PCRE_PARTIAL_HARD affects the matching of $, \z, \Z, \b, and
   73   \B.
   75 . Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
   76   bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
   78 . Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
   79   START_OPTIMIZE option, which is now allowed at compile time
   82 Release 8.10 25-Jun-2010
   83 ------------------------
   85 There are two major additions: support for (*MARK) and friends, and the option
   86 PCRE_UCP, which changes the behaviour of \b, \d, \s, and \w (and their
   87 opposites) so that they make use of Unicode properties. There are also a number
   88 of lesser new features, and several bugs have been fixed. A new option,
   89 --line-buffered, has been added to pcregrep, for use when it is connected to
   90 pipes.
   93 Release 8.02 19-Mar-2010
   94 ------------------------
   96 Another bug-fix release.
   99 Release 8.01 19-Jan-2010
  100 ------------------------
  102 This is a bug-fix release. Several bugs in the code itself and some bugs and
  103 infelicities in the build system have been fixed.
  106 Release 8.00 19-Oct-09
  107 ----------------------
  109 Bugs have been fixed in the library and in pcregrep. There are also some
  110 enhancements. Restrictions on patterns used for partial matching have been
  111 removed, extra information is given for partial matches, the partial matching
  112 process has been improved, and an option to make a partial match override a
  113 full match is available. The "study" process has been enhanced by finding a
  114 lower bound matching length. Groups with duplicate numbers may now have
  115 duplicated names without the use of PCRE_DUPNAMES. However, they may not have
  116 different names. The documentation has been revised to reflect these changes.
  117 The version number has been expanded to 3 digits as it is clear that the rate
  118 of change is not slowing down.
  121 Release 7.9 11-Apr-09
  122 ---------------------
  124 Mostly bugfixes and tidies with just a couple of minor functional additions.
  127 Release 7.8 05-Sep-08
  128 ---------------------
  130 More bug fixes, plus a performance improvement in Unicode character property
  131 lookup.
  134 Release 7.7 07-May-08
  135 ---------------------
  137 This is once again mainly a bug-fix release, but there are a couple of new
  138 features.
  141 Release 7.6 28-Jan-08
  142 ---------------------
  144 The main reason for having this release so soon after 7.5 is because it fixes a
  145 potential buffer overflow problem in pcre_compile() when run in UTF-8 mode. In
  146 addition, the CMake configuration files have been brought up to date.
  149 Release 7.5 10-Jan-08
  150 ---------------------
  152 This is mainly a bug-fix release. However the ability to link pcregrep with
  153 libz or libbz2 and the ability to link pcretest with libreadline have been
  154 added. Also the --line-offsets and --file-offsets options were added to
  155 pcregrep.
  158 Release 7.4 21-Sep-07
  159 ---------------------
  161 The only change of specification is the addition of options to control whether
  162 \R matches any Unicode line ending (the default) or just CR, LF, and CRLF.
  163 Otherwise, the changes are bug fixes and a refactoring to reduce the number of
  164 relocations needed in a shared library. There have also been some documentation
  165 updates, in particular, some more information about using CMake to build PCRE
  166 has been added to the NON-UNIX-USE file.
  169 Release 7.3 28-Aug-07
  170 ---------------------
  172 Most changes are bug fixes. Some that are not:
  174 1. There is some support for Perl 5.10's experimental "backtracking control
  175    verbs" such as (*PRUNE).
  177 2. UTF-8 checking is now as per RFC 3629 instead of RFC 2279; this is more
  178    restrictive in the strings it accepts.
  180 3. Checking for potential integer overflow has been made more dynamic, and as a
  181    consequence there is no longer a hard limit on the size of a subpattern that
  182    has a limited repeat count.
  184 4. When CRLF is a valid line-ending sequence, pcre_exec() and pcre_dfa_exec()
  185    no longer advance by two characters instead of one when an unanchored match
  186    fails at CRLF if there are explicit CR or LF matches within the pattern.
  187    This gets rid of some anomalous effects that previously occurred.
  189 5. Some PCRE-specific settings for varying the newline options at the start of
  190    a pattern have been added.
  193 Release 7.2 19-Jun-07
  194 ---------------------
  196 WARNING: saved patterns that were compiled by earlier versions of PCRE must be
  197 recompiled for use with 7.2 (necessitated by the addition of \K, \h, \H, \v,
  198 and \V).
  200 Correction to the notes for 7.1: the note about shared libraries for Windows is
  201 wrong. Previously, three libraries were built, but each could function
  202 independently. For example, the pcreposix library also included all the
  203 functions from the basic pcre library. The change is that the three libraries
  204 are no longer independent. They are like the Unix libraries. To use the
  205 pcreposix functions, for example, you need to link with both the pcreposix and
  206 the basic pcre library.
  208 Some more features from Perl 5.10 have been added:
  210   (?-n) and (?+n) relative references for recursion and subroutines.
  212   (?(-n) and (?(+n) relative references as conditions.
  214   \k{name} and \g{name} are synonyms for \k<name>.
  216   \K to reset the start of the matched string; for example, (foo)\Kbar
  217   matches bar preceded by foo, but only sets bar as the matched string.
  219   (?| introduces a group where the capturing parentheses in each alternative
  220   start from the same number; for example, (?|(abc)|(xyz)) sets capturing
  221   parentheses number 1 in both cases.
  223   \h, \H, \v, \V match horizontal and vertical whitespace, respectively.
  226 Release 7.1 24-Apr-07
  227 ---------------------
  229 There is only one new feature in this release: a linebreak setting of
  230 PCRE_NEWLINE_ANYCRLF. It is a cut-down version of PCRE_NEWLINE_ANY, which
  231 recognizes only CRLF, CR, and LF as linebreaks.
  233 A few bugs are fixed (see ChangeLog for details), but the major change is a
  234 complete re-implementation of the build system. This now has full Autotools
  235 support and so is now "standard" in some sense. It should help with compiling
  236 PCRE in a wide variety of environments.
  238 NOTE: when building shared libraries for Windows, three dlls are now built,
  239 called libpcre, libpcreposix, and libpcrecpp. Previously, everything was
  240 included in a single dll.
  242 Another important change is that the dftables auxiliary program is no longer
  243 compiled and run at "make" time by default. Instead, a default set of character
  244 tables (assuming ASCII coding) is used. If you want to use dftables to generate
  245 the character tables as previously, add --enable-rebuild-chartables to the
  246 "configure" command. You must do this if you are compiling PCRE to run on a
  247 system that uses EBCDIC code.
  249 There is a discussion about character tables in the README file. The default is
  250 not to use dftables so that that there is no problem when cross-compiling.
  253 Release 7.0 19-Dec-06
  254 ---------------------
  256 This release has a new major number because there have been some internal
  257 upheavals to facilitate the addition of new optimizations and other facilities,
  258 and to make subsequent maintenance and extension easier. Compilation is likely
  259 to be a bit slower, but there should be no major effect on runtime performance.
  260 Previously compiled patterns are NOT upwards compatible with this release. If
  261 you have saved compiled patterns from a previous release, you will have to
  262 re-compile them. Important changes that are visible to users are:
  264 1. The Unicode property tables have been updated to Unicode 5.0.0, which adds
  265    some more scripts.
  267 2. The option PCRE_NEWLINE_ANY causes PCRE to recognize any Unicode newline
  268    sequence as a newline.
  270 3. The \R escape matches a single Unicode newline sequence as a single unit.
  272 4. New features that will appear in Perl 5.10 are now in PCRE. These include
  273    alternative Perl syntax for named parentheses, and Perl syntax for
  274    recursion.
  276 5. The C++ wrapper interface has been extended by the addition of a
  277    QuoteMeta function and the ability to allow copy construction and
  278    assignment.
  280 For a complete list of changes, see the ChangeLog file.
  283 Release 6.7 04-Jul-06
  284 ---------------------
  286 The main additions to this release are the ability to use the same name for
  287 multiple sets of parentheses, and support for CRLF line endings in both the
  288 library and pcregrep (and in pcretest for testing).
  290 Thanks to Ian Taylor, the stack usage for many kinds of pattern has been
  291 significantly reduced for certain subject strings.
  294 Release 6.5 01-Feb-06
  295 ---------------------
  297 Important changes in this release:
  299 1. A number of new features have been added to pcregrep.
  301 2. The Unicode property tables have been updated to Unicode 4.1.0, and the
  302    supported properties have been extended with script names such as "Arabic",
  303    and the derived properties "Any" and "L&". This has necessitated a change to
  304    the interal format of compiled patterns. Any saved compiled patterns that
  305    use \p or \P must be recompiled.
  307 3. The specification of recursion in patterns has been changed so that all
  308    recursive subpatterns are automatically treated as atomic groups. Thus, for
  309    example, (?R) is treated as if it were (?>(?R)). This is necessary because
  310    otherwise there are situations where recursion does not work.
  312 See the ChangeLog for a complete list of changes, which include a number of bug
  313 fixes and tidies.
  316 Release 6.0 07-Jun-05
  317 ---------------------
  319 The release number has been increased to 6.0 because of the addition of several
  320 major new pieces of functionality.
  322 A new function, pcre_dfa_exec(), which implements pattern matching using a DFA
  323 algorithm, has been added. This has a number of advantages for certain cases,
  324 though it does run more slowly, and lacks the ability to capture substrings. On
  325 the other hand, it does find all matches, not just the first, and it works
  326 better for partial matching. The pcrematching man page discusses the
  327 differences.
  329 The pcretest program has been enhanced so that it can make use of the new
  330 pcre_dfa_exec() matching function and the extra features it provides.
  332 The distribution now includes a C++ wrapper library. This is built
  333 automatically if a C++ compiler is found. The pcrecpp man page discusses this
  334 interface.
  336 The code itself has been re-organized into many more files, one for each
  337 function, so it no longer requires everything to be linked in when static
  338 linkage is used. As a consequence, some internal functions have had to have
  339 their names exposed. These functions all have names starting with _pcre_. They
  340 are undocumented, and are not intended for use by outside callers.
  342 The pcregrep program has been enhanced with new functionality such as
  343 multiline-matching and options for output more matching context. See the
  344 ChangeLog for a complete list of changes to the library and the utility
  345 programs.
  348 Release 5.0 13-Sep-04
  349 ---------------------
  351 The licence under which PCRE is released has been changed to the more
  352 conventional "BSD" licence.
  354 In the code, some bugs have been fixed, and there are also some major changes
  355 in this release (which is why I've increased the number to 5.0). Some changes
  356 are internal rearrangements, and some provide a number of new facilities. The
  357 new features are:
  359 1. There's an "automatic callout" feature that inserts callouts before every
  360    item in the regex, and there's a new callout field that gives the position
  361    in the pattern - useful for debugging and tracing.
  363 2. The extra_data structure can now be used to pass in a set of character
  364    tables at exec time. This is useful if compiled regex are saved and re-used
  365    at a later time when the tables may not be at the same address. If the
  366    default internal tables are used, the pointer saved with the compiled
  367    pattern is now set to NULL, which means that you don't need to do anything
  368    special unless you are using custom tables.
  370 3. It is possible, with some restrictions on the content of the regex, to
  371    request "partial" matching. A special return code is given if all of the
  372    subject string matched part of the regex. This could be useful for testing
  373    an input field as it is being typed.
  375 4. There is now some optional support for Unicode character properties, which
  376    means that the patterns items such as \p{Lu} and \X can now be used. Only
  377    the general category properties are supported. If PCRE is compiled with this
  378    support, an additional 90K data structure is include, which increases the
  379    size of the library dramatically.
  381 5. There is support for saving compiled patterns and re-using them later.
  383 6. There is support for running regular expressions that were compiled on a
  384    different host with the opposite endianness.
  386 7. The pcretest program has been extended to accommodate the new features.
  388 The main internal rearrangement is that sequences of literal characters are no
  389 longer handled as strings. Instead, each character is handled on its own. This
  390 makes some UTF-8 handling easier, and makes the support of partial matching
  391 possible. Compiled patterns containing long literal strings will be larger as a
  392 result of this change; I hope that performance will not be much affected.
  395 Release 4.5 01-Dec-03
  396 ---------------------
  398 Again mainly a bug-fix and tidying release, with only a couple of new features:
  400 1. It's possible now to compile PCRE so that it does not use recursive
  401 function calls when matching. Instead it gets memory from the heap. This slows
  402 things down, but may be necessary on systems with limited stacks.
  404 2. UTF-8 string checking has been tightened to reject overlong sequences and to
  405 check that a starting offset points to the start of a character. Failure of the
  406 latter returns a new error code: PCRE_ERROR_BADUTF8_OFFSET.
  408 3. PCRE can now be compiled for systems that use EBCDIC code.
  411 Release 4.4 21-Aug-03
  412 ---------------------
  414 This is mainly a bug-fix and tidying release. The only new feature is that PCRE
  415 checks UTF-8 strings for validity by default. There is an option to suppress
  416 this, just in case anybody wants that teeny extra bit of performance.
  419 Releases 4.1 - 4.3
  420 ------------------
  422 Sorry, I forgot about updating the NEWS file for these releases. Please take a
  423 look at ChangeLog.
  426 Release 4.0 17-Feb-03
  427 ---------------------
  429 There have been a lot of changes for the 4.0 release, adding additional
  430 functionality and mending bugs. Below is a list of the highlights of the new
  431 functionality. For full details of these features, please consult the
  432 documentation. For a complete list of changes, see the ChangeLog file.
  434 1. Support for Perl's \Q...\E escapes.
  436 2. "Possessive quantifiers" ?+, *+, ++, and {,}+ which come from Sun's Java
  437 package. They provide some syntactic sugar for simple cases of "atomic
  438 grouping".
  440 3. Support for the \G assertion. It is true when the current matching position
  441 is at the start point of the match.
  443 4. A new feature that provides some of the functionality that Perl provides
  444 with (?{...}). The facility is termed a "callout". The way it is done in PCRE
  445 is for the caller to provide an optional function, by setting pcre_callout to
  446 its entry point. To get the function called, the regex must include (?C) at
  447 appropriate points.
  449 5. Support for recursive calls to individual subpatterns. This makes it really
  450 easy to get totally confused.
  452 6. Support for named subpatterns. The Python syntax (?P<name>...) is used to
  453 name a group.
  455 7. Several extensions to UTF-8 support; it is now fairly complete. There is an
  456 option for pcregrep to make it operate in UTF-8 mode.
  458 8. The single man page has been split into a number of separate man pages.
  459 These also give rise to individual HTML pages which are put in a separate
  460 directory. There is an index.html page that lists them all. Some hyperlinking
  461 between the pages has been installed.
  464 Release 3.5 15-Aug-01
  465 ---------------------
  467 1. The configuring system has been upgraded to use later versions of autoconf
  468 and libtool. By default it builds both a shared and a static library if the OS
  469 supports it. You can use --disable-shared or --disable-static on the configure
  470 command if you want only one of them.
  472 2. The pcretest utility is now installed along with pcregrep because it is
  473 useful for users (to test regexs) and by doing this, it automatically gets
  474 relinked by libtool. The documentation has been turned into a man page, so
  475 there are now .1, .txt, and .html versions in /doc.
  477 3. Upgrades to pcregrep:
  478    (i)   Added long-form option names like gnu grep.
  479    (ii)  Added --help to list all options with an explanatory phrase.
  480    (iii) Added -r, --recursive to recurse into sub-directories.
  481    (iv)  Added -f, --file to read patterns from a file.
  483 4. Added --enable-newline-is-cr and --enable-newline-is-lf to the configure
  484 script, to force use of CR or LF instead of \n in the source. On non-Unix
  485 systems, the value can be set in config.h.
  487 5. The limit of 200 on non-capturing parentheses is a _nesting_ limit, not an
  488 absolute limit. Changed the text of the error message to make this clear, and
  489 likewise updated the man page.
  491 6. The limit of 99 on the number of capturing subpatterns has been removed.
  492 The new limit is 65535, which I hope will not be a "real" limit.
  495 Release 3.3 01-Aug-00
  496 ---------------------
  498 There is some support for UTF-8 character strings. This is incomplete and
  499 experimental. The documentation describes what is and what is not implemented.
  500 Otherwise, this is just a bug-fixing release.
  503 Release 3.0 01-Feb-00
  504 ---------------------
  506 1. A "configure" script is now used to configure PCRE for Unix systems. It
  507 builds a Makefile, a config.h file, and the pcre-config script.
  509 2. PCRE is built as a shared library by default.
  511 3. There is support for POSIX classes such as [:alpha:].
  513 5. There is an experimental recursion feature.
  515 ----------------------------------------------------------------------------
  518 Please note that there has been a change in the API such that a larger
  519 ovector is required at matching time, to provide some additional workspace.
  520 The new man page has details. This change was necessary in order to support
  521 some of the new functionality in Perl 5.005.
  525 Another (I hope this is the last!) change has been made to the API for the
  526 pcre_compile() function. An additional argument has been added to make it
  527 possible to pass over a pointer to character tables built in the current
  528 locale by pcre_maketables(). To use the default tables, this new arguement
  529 should be passed as NULL.
  533 Yet another (and again I hope this really is the last) change has been made
  534 to the API for the pcre_exec() function. An additional argument has been
  535 added to make it possible to start the match other than at the start of the
  536 subject string. This is important if there are lookbehinds. The new man
  537 page has the details, but you just want to convert existing programs, all
  538 you need to do is to stick in a new fifth argument to pcre_exec(), with a
  539 value of zero. For example, change
  541   pcre_exec(pattern, extra, subject, length, options, ovec, ovecsize)
  542 to
  543   pcre_exec(pattern, extra, subject, length, 0, options, ovec, ovecsize)
  545 ****