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    1 News about PCRE releases
    2 ------------------------
    3 
    4 Note that this library (now called PCRE1) is now being maintained for bug fixes
    5 only. New projects are advised to use the new PCRE2 libraries.
    6 
    7 
    8 Release 8.44 12-February-2020
    9 -----------------------------
   10 
   11 This is a bug-fix release.
   12 
   13 
   14 Release 8.43 23-February-2019
   15 -----------------------------
   16 
   17 This is a bug-fix release.
   18 
   19 
   20 Release 8.42 20-March-2018
   21 --------------------------
   22 
   23 This is a bug-fix release.
   24 
   25 
   26 Release 8.41 13-June-2017
   27 -------------------------
   28 
   29 This is a bug-fix release.
   30 
   31 
   32 Release 8.40 11-January-2017
   33 ----------------------------
   34 
   35 This is a bug-fix release.
   36 
   37 
   38 Release 8.39 14-June-2016
   39 -------------------------
   40 
   41 Some appropriate PCRE2 JIT improvements have been retro-fitted to PCRE1. Apart
   42 from that, this is another bug-fix release. Note that this library (now called
   43 PCRE1) is now being maintained for bug fixes only. New projects are advised to
   44 use the new PCRE2 libraries.
   45 
   46 
   47 Release 8.38 23-November-2015
   48 -----------------------------
   49 
   50 This is bug-fix release. Note that this library (now called PCRE1) is now being
   51 maintained for bug fixes only. New projects are advised to use the new PCRE2
   52 libraries.
   53 
   54 
   55 Release 8.37 28-April-2015
   56 --------------------------
   57 
   58 This is bug-fix release. Note that this library (now called PCRE1) is now being
   59 maintained for bug fixes only. New projects are advised to use the new PCRE2
   60 libraries.
   61 
   62 
   63 Release 8.36 26-September-2014
   64 ------------------------------
   65 
   66 This is primarily a bug-fix release. However, in addition, the Unicode data
   67 tables have been updated to Unicode 7.0.0.
   68 
   69 
   70 Release 8.35 04-April-2014
   71 --------------------------
   72 
   73 There have been performance improvements for classes containing non-ASCII
   74 characters and the "auto-possessification" feature has been extended. Other
   75 minor improvements have been implemented and bugs fixed. There is a new callout
   76 feature to enable applications to do detailed stack checks at compile time, to
   77 avoid running out of stack for deeply nested parentheses. The JIT compiler has
   78 been extended with experimental support for ARM-64, MIPS-64, and PPC-LE.
   79 
   80 
   81 Release 8.34 15-December-2013
   82 -----------------------------
   83 
   84 As well as fixing the inevitable bugs, performance has been improved by
   85 refactoring and extending the amount of "auto-possessification" that PCRE does.
   86 Other notable changes:
   87 
   88 .  Implemented PCRE_INFO_MATCH_EMPTY, which yields 1 if the pattern can match
   89    an empty string. If it can, pcretest shows this in its information output.
   90 
   91 .  A back reference to a named subpattern when there is more than one of the
   92    same name now checks them in the order in which they appear in the pattern.
   93    The first one that is set is used for the reference. Previously only the
   94    first one was inspected. This change makes PCRE more compatible with Perl.
   95 
   96 .  Unicode character properties were updated from Unicode 6.3.0.
   97 
   98 .  The character VT has been added to the set of characters that match \s and
   99    are generally treated as white space, following this same change in Perl
  100    5.18. There is now no difference between "Perl space" and "POSIX space".
  101 
  102 .  Perl has changed its handling of \8 and \9. If there is no previously
  103    encountered capturing group of those numbers, they are treated as the
  104    literal characters 8 and 9 instead of a binary zero followed by the
  105    literals. PCRE now does the same.
  106 
  107 .  Following Perl, added \o{} to specify codepoints in octal, making it
  108    possible to specify values greater than 0777 and also making them
  109    unambiguous.
  110 
  111 .  In UCP mode, \s was not matching two of the characters that Perl matches,
  112    namely NEL (U+0085) and MONGOLIAN VOWEL SEPARATOR (U+180E), though they
  113    were matched by \h.
  114 
  115 .  Add JIT support for the 64 bit TileGX architecture.
  116 
  117 .  Upgraded the handling of the POSIX classes [:graph:], [:print:], and
  118    [:punct:] when PCRE_UCP is set so as to include the same characters as Perl
  119    does in Unicode mode.
  120 
  121 .  Perl no longer allows group names to start with digits, so I have made this
  122    change also in PCRE.
  123 
  124 .  Added support for [[:<:]] and [[:>:]] as used in the BSD POSIX library to
  125    mean "start of word" and "end of word", respectively, as a transition aid.
  126 
  127 
  128 Release 8.33 28-May-2013
  129 --------------------------
  130 
  131 A number of bugs are fixed, and some performance improvements have been made.
  132 There are also some new features, of which these are the most important:
  133 
  134 .  The behaviour of the backtracking verbs has been rationalized and
  135    documented in more detail.
  136 
  137 .  JIT now supports callouts and all of the backtracking verbs.
  138 
  139 .  Unicode validation has been updated in the light of Unicode Corrigendum #9,
  140    which points out that "non characters" are not "characters that may not
  141    appear in Unicode strings" but rather "characters that are reserved for
  142    internal use and have only local meaning".
  143 
  144 .  (*LIMIT_MATCH=d) and (*LIMIT_RECURSION=d) have been added so that the
  145    creator of a pattern can specify lower (but not higher) limits for the
  146    matching process.
  147 
  148 .  The PCRE_NEVER_UTF option is available to prevent pattern-writers from using
  149    the (*UTF) feature, as this could be a security issue.
  150 
  151 
  152 Release 8.32 30-November-2012
  153 -----------------------------
  154 
  155 This release fixes a number of bugs, but also has some new features. These are
  156 the highlights:
  157 
  158 .  There is now support for 32-bit character strings and UTF-32. Like the
  159    16-bit support, this is done by compiling a separate 32-bit library.
  160 
  161 .  \X now matches a Unicode extended grapheme cluster.
  162 
  163 .  Case-independent matching of Unicode characters that have more than one
  164    "other case" now makes all three (or more) characters equivalent. This
  165    applies, for example, to Greek Sigma, which has two lowercase versions.
  166 
  167 .  Unicode character properties are updated to Unicode 6.2.0.
  168 
  169 .  The EBCDIC support, which had decayed, has had a spring clean.
  170 
  171 .  A number of JIT optimizations have been added, which give faster JIT
  172    execution speed. In addition, a new direct interface to JIT execution is
  173    available. This bypasses some of the sanity checks of pcre_exec() to give a
  174    noticeable speed-up.
  175 
  176 .  A number of issues in pcregrep have been fixed, making it more compatible
  177    with GNU grep. In particular, --exclude and --include (and variants) apply
  178    to all files now, not just those obtained from scanning a directory
  179    recursively. In Windows environments, the default action for directories is
  180    now "skip" instead of "read" (which provokes an error).
  181 
  182 .  If the --only-matching (-o) option in pcregrep is specified multiple
  183    times, each one causes appropriate output. For example, -o1 -o2 outputs the
  184    substrings matched by the 1st and 2nd capturing parentheses. A separating
  185    string can be specified by --om-separator (default empty).
  186 
  187 .  When PCRE is built via Autotools using a version of gcc that has the
  188    "visibility" feature, it is used to hide internal library functions that are
  189    not part of the public API.
  190 
  191 
  192 Release 8.31 06-July-2012
  193 -------------------------
  194 
  195 This is mainly a bug-fixing release, with a small number of developments:
  196 
  197 . The JIT compiler now supports partial matching and the (*MARK) and
  198   (*COMMIT) verbs.
  199 
  200 . PCRE_INFO_MAXLOOKBEHIND can be used to find the longest lookbehind in a
  201   pattern.
  202 
  203 . There should be a performance improvement when using the heap instead of the
  204   stack for recursion.
  205 
  206 . pcregrep can now be linked with libedit as an alternative to libreadline.
  207 
  208 . pcregrep now has a --file-list option where the list of files to scan is
  209   given as a file.
  210 
  211 . pcregrep now recognizes binary files and there are related options.
  212 
  213 . The Unicode tables have been updated to 6.1.0.
  214 
  215 As always, the full list of changes is in the ChangeLog file.
  216 
  217 
  218 Release 8.30 04-February-2012
  219 -----------------------------
  220 
  221 Release 8.30 introduces a major new feature: support for 16-bit character
  222 strings, compiled as a separate library. There are a few changes to the
  223 8-bit library, in addition to some bug fixes.
  224 
  225 . The pcre_info() function, which has been obsolete for over 10 years, has
  226   been removed.
  227 
  228 . When a compiled pattern was saved to a file and later reloaded on a host
  229   with different endianness, PCRE used automatically to swap the bytes in some
  230   of the data fields. With the advent of the 16-bit library, where more of this
  231   swapping is needed, it is no longer done automatically. Instead, the bad
  232   endianness is detected and a specific error is given. The user can then call
  233   a new function called pcre_pattern_to_host_byte_order() (or an equivalent
  234   16-bit function) to do the swap.
  235 
  236 . In UTF-8 mode, the values 0xd800 to 0xdfff are not legal Unicode
  237   code points and are now faulted. (They are the so-called "surrogates"
  238   that are reserved for coding high values in UTF-16.)
  239 
  240 
  241 Release 8.21 12-Dec-2011
  242 ------------------------
  243 
  244 This is almost entirely a bug-fix release. The only new feature is the ability
  245 to obtain the size of the memory used by the JIT compiler.
  246 
  247 
  248 Release 8.20 21-Oct-2011
  249 ------------------------
  250 
  251 The main change in this release is the inclusion of Zoltan Herczeg's
  252 just-in-time compiler support, which can be accessed by building PCRE with
  253 --enable-jit. Large performance benefits can be had in many situations. 8.20
  254 also fixes an unfortunate bug that was introduced in 8.13 as well as tidying up
  255 a number of infelicities and differences from Perl.
  256 
  257 
  258 Release 8.13 16-Aug-2011
  259 ------------------------
  260 
  261 This is mainly a bug-fix release. There has been a lot of internal refactoring.
  262 The Unicode tables have been updated. The only new feature in the library is
  263 the passing of *MARK information to callouts. Some additions have been made to
  264 pcretest to make testing easier and more comprehensive. There is a new option
  265 for pcregrep to adjust its internal buffer size.
  266 
  267 
  268 Release 8.12 15-Jan-2011
  269 ------------------------
  270 
  271 This release fixes some bugs in pcregrep, one of which caused the tests to fail
  272 on 64-bit big-endian systems. There are no changes to the code of the library.
  273 
  274 
  275 Release 8.11 10-Dec-2010
  276 ------------------------
  277 
  278 A number of bugs in the library and in pcregrep have been fixed. As always, see
  279 ChangeLog for details. The following are the non-bug-fix changes:
  280 
  281 . Added --match-limit and --recursion-limit to pcregrep.
  282 
  283 . Added an optional parentheses number to the -o and --only-matching options
  284   of pcregrep.
  285 
  286 . Changed the way PCRE_PARTIAL_HARD affects the matching of $, \z, \Z, \b, and
  287   \B.
  288 
  289 . Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
  290   bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
  291 
  292 . Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
  293   START_OPTIMIZE option, which is now allowed at compile time
  294 
  295 
  296 Release 8.10 25-Jun-2010
  297 ------------------------
  298 
  299 There are two major additions: support for (*MARK) and friends, and the option
  300 PCRE_UCP, which changes the behaviour of \b, \d, \s, and \w (and their
  301 opposites) so that they make use of Unicode properties. There are also a number
  302 of lesser new features, and several bugs have been fixed. A new option,
  303 --line-buffered, has been added to pcregrep, for use when it is connected to
  304 pipes.
  305 
  306 
  307 Release 8.02 19-Mar-2010
  308 ------------------------
  309 
  310 Another bug-fix release.
  311 
  312 
  313 Release 8.01 19-Jan-2010
  314 ------------------------
  315 
  316 This is a bug-fix release. Several bugs in the code itself and some bugs and
  317 infelicities in the build system have been fixed.
  318 
  319 
  320 Release 8.00 19-Oct-09
  321 ----------------------
  322 
  323 Bugs have been fixed in the library and in pcregrep. There are also some
  324 enhancements. Restrictions on patterns used for partial matching have been
  325 removed, extra information is given for partial matches, the partial matching
  326 process has been improved, and an option to make a partial match override a
  327 full match is available. The "study" process has been enhanced by finding a
  328 lower bound matching length. Groups with duplicate numbers may now have
  329 duplicated names without the use of PCRE_DUPNAMES. However, they may not have
  330 different names. The documentation has been revised to reflect these changes.
  331 The version number has been expanded to 3 digits as it is clear that the rate
  332 of change is not slowing down.
  333 
  334 
  335 Release 7.9 11-Apr-09
  336 ---------------------
  337 
  338 Mostly bugfixes and tidies with just a couple of minor functional additions.
  339 
  340 
  341 Release 7.8 05-Sep-08
  342 ---------------------
  343 
  344 More bug fixes, plus a performance improvement in Unicode character property
  345 lookup.
  346 
  347 
  348 Release 7.7 07-May-08
  349 ---------------------
  350 
  351 This is once again mainly a bug-fix release, but there are a couple of new
  352 features.
  353 
  354 
  355 Release 7.6 28-Jan-08
  356 ---------------------
  357 
  358 The main reason for having this release so soon after 7.5 is because it fixes a
  359 potential buffer overflow problem in pcre_compile() when run in UTF-8 mode. In
  360 addition, the CMake configuration files have been brought up to date.
  361 
  362 
  363 Release 7.5 10-Jan-08
  364 ---------------------
  365 
  366 This is mainly a bug-fix release. However the ability to link pcregrep with
  367 libz or libbz2 and the ability to link pcretest with libreadline have been
  368 added. Also the --line-offsets and --file-offsets options were added to
  369 pcregrep.
  370 
  371 
  372 Release 7.4 21-Sep-07
  373 ---------------------
  374 
  375 The only change of specification is the addition of options to control whether
  376 \R matches any Unicode line ending (the default) or just CR, LF, and CRLF.
  377 Otherwise, the changes are bug fixes and a refactoring to reduce the number of
  378 relocations needed in a shared library. There have also been some documentation
  379 updates, in particular, some more information about using CMake to build PCRE
  380 has been added to the NON-UNIX-USE file.
  381 
  382 
  383 Release 7.3 28-Aug-07
  384 ---------------------
  385 
  386 Most changes are bug fixes. Some that are not:
  387 
  388 1. There is some support for Perl 5.10's experimental "backtracking control
  389    verbs" such as (*PRUNE).
  390 
  391 2. UTF-8 checking is now as per RFC 3629 instead of RFC 2279; this is more
  392    restrictive in the strings it accepts.
  393 
  394 3. Checking for potential integer overflow has been made more dynamic, and as a
  395    consequence there is no longer a hard limit on the size of a subpattern that
  396    has a limited repeat count.
  397 
  398 4. When CRLF is a valid line-ending sequence, pcre_exec() and pcre_dfa_exec()
  399    no longer advance by two characters instead of one when an unanchored match
  400    fails at CRLF if there are explicit CR or LF matches within the pattern.
  401    This gets rid of some anomalous effects that previously occurred.
  402 
  403 5. Some PCRE-specific settings for varying the newline options at the start of
  404    a pattern have been added.
  405 
  406 
  407 Release 7.2 19-Jun-07
  408 ---------------------
  409 
  410 WARNING: saved patterns that were compiled by earlier versions of PCRE must be
  411 recompiled for use with 7.2 (necessitated by the addition of \K, \h, \H, \v,
  412 and \V).
  413 
  414 Correction to the notes for 7.1: the note about shared libraries for Windows is
  415 wrong. Previously, three libraries were built, but each could function
  416 independently. For example, the pcreposix library also included all the
  417 functions from the basic pcre library. The change is that the three libraries
  418 are no longer independent. They are like the Unix libraries. To use the
  419 pcreposix functions, for example, you need to link with both the pcreposix and
  420 the basic pcre library.
  421 
  422 Some more features from Perl 5.10 have been added:
  423 
  424   (?-n) and (?+n) relative references for recursion and subroutines.
  425 
  426   (?(-n) and (?(+n) relative references as conditions.
  427 
  428   \k{name} and \g{name} are synonyms for \k<name>.
  429 
  430   \K to reset the start of the matched string; for example, (foo)\Kbar
  431   matches bar preceded by foo, but only sets bar as the matched string.
  432 
  433   (?| introduces a group where the capturing parentheses in each alternative
  434   start from the same number; for example, (?|(abc)|(xyz)) sets capturing
  435   parentheses number 1 in both cases.
  436 
  437   \h, \H, \v, \V match horizontal and vertical whitespace, respectively.
  438 
  439 
  440 Release 7.1 24-Apr-07
  441 ---------------------
  442 
  443 There is only one new feature in this release: a linebreak setting of
  444 PCRE_NEWLINE_ANYCRLF. It is a cut-down version of PCRE_NEWLINE_ANY, which
  445 recognizes only CRLF, CR, and LF as linebreaks.
  446 
  447 A few bugs are fixed (see ChangeLog for details), but the major change is a
  448 complete re-implementation of the build system. This now has full Autotools
  449 support and so is now "standard" in some sense. It should help with compiling
  450 PCRE in a wide variety of environments.
  451 
  452 NOTE: when building shared libraries for Windows, three dlls are now built,
  453 called libpcre, libpcreposix, and libpcrecpp. Previously, everything was
  454 included in a single dll.
  455 
  456 Another important change is that the dftables auxiliary program is no longer
  457 compiled and run at "make" time by default. Instead, a default set of character
  458 tables (assuming ASCII coding) is used. If you want to use dftables to generate
  459 the character tables as previously, add --enable-rebuild-chartables to the
  460 "configure" command. You must do this if you are compiling PCRE to run on a
  461 system that uses EBCDIC code.
  462 
  463 There is a discussion about character tables in the README file. The default is
  464 not to use dftables so that that there is no problem when cross-compiling.
  465 
  466 
  467 Release 7.0 19-Dec-06
  468 ---------------------
  469 
  470 This release has a new major number because there have been some internal
  471 upheavals to facilitate the addition of new optimizations and other facilities,
  472 and to make subsequent maintenance and extension easier. Compilation is likely
  473 to be a bit slower, but there should be no major effect on runtime performance.
  474 Previously compiled patterns are NOT upwards compatible with this release. If
  475 you have saved compiled patterns from a previous release, you will have to
  476 re-compile them. Important changes that are visible to users are:
  477 
  478 1. The Unicode property tables have been updated to Unicode 5.0.0, which adds
  479    some more scripts.
  480 
  481 2. The option PCRE_NEWLINE_ANY causes PCRE to recognize any Unicode newline
  482    sequence as a newline.
  483 
  484 3. The \R escape matches a single Unicode newline sequence as a single unit.
  485 
  486 4. New features that will appear in Perl 5.10 are now in PCRE. These include
  487    alternative Perl syntax for named parentheses, and Perl syntax for
  488    recursion.
  489 
  490 5. The C++ wrapper interface has been extended by the addition of a
  491    QuoteMeta function and the ability to allow copy construction and
  492    assignment.
  493 
  494 For a complete list of changes, see the ChangeLog file.
  495 
  496 
  497 Release 6.7 04-Jul-06
  498 ---------------------
  499 
  500 The main additions to this release are the ability to use the same name for
  501 multiple sets of parentheses, and support for CRLF line endings in both the
  502 library and pcregrep (and in pcretest for testing).
  503 
  504 Thanks to Ian Taylor, the stack usage for many kinds of pattern has been
  505 significantly reduced for certain subject strings.
  506 
  507 
  508 Release 6.5 01-Feb-06
  509 ---------------------
  510 
  511 Important changes in this release:
  512 
  513 1. A number of new features have been added to pcregrep.
  514 
  515 2. The Unicode property tables have been updated to Unicode 4.1.0, and the
  516    supported properties have been extended with script names such as "Arabic",
  517    and the derived properties "Any" and "L&". This has necessitated a change to
  518    the interal format of compiled patterns. Any saved compiled patterns that
  519    use \p or \P must be recompiled.
  520 
  521 3. The specification of recursion in patterns has been changed so that all
  522    recursive subpatterns are automatically treated as atomic groups. Thus, for
  523    example, (?R) is treated as if it were (?>(?R)). This is necessary because
  524    otherwise there are situations where recursion does not work.
  525 
  526 See the ChangeLog for a complete list of changes, which include a number of bug
  527 fixes and tidies.
  528 
  529 
  530 Release 6.0 07-Jun-05
  531 ---------------------
  532 
  533 The release number has been increased to 6.0 because of the addition of several
  534 major new pieces of functionality.
  535 
  536 A new function, pcre_dfa_exec(), which implements pattern matching using a DFA
  537 algorithm, has been added. This has a number of advantages for certain cases,
  538 though it does run more slowly, and lacks the ability to capture substrings. On
  539 the other hand, it does find all matches, not just the first, and it works
  540 better for partial matching. The pcrematching man page discusses the
  541 differences.
  542 
  543 The pcretest program has been enhanced so that it can make use of the new
  544 pcre_dfa_exec() matching function and the extra features it provides.
  545 
  546 The distribution now includes a C++ wrapper library. This is built
  547 automatically if a C++ compiler is found. The pcrecpp man page discusses this
  548 interface.
  549 
  550 The code itself has been re-organized into many more files, one for each
  551 function, so it no longer requires everything to be linked in when static
  552 linkage is used. As a consequence, some internal functions have had to have
  553 their names exposed. These functions all have names starting with _pcre_. They
  554 are undocumented, and are not intended for use by outside callers.
  555 
  556 The pcregrep program has been enhanced with new functionality such as
  557 multiline-matching and options for output more matching context. See the
  558 ChangeLog for a complete list of changes to the library and the utility
  559 programs.
  560 
  561 
  562 Release 5.0 13-Sep-04
  563 ---------------------
  564 
  565 The licence under which PCRE is released has been changed to the more
  566 conventional "BSD" licence.
  567 
  568 In the code, some bugs have been fixed, and there are also some major changes
  569 in this release (which is why I've increased the number to 5.0). Some changes
  570 are internal rearrangements, and some provide a number of new facilities. The
  571 new features are:
  572 
  573 1. There's an "automatic callout" feature that inserts callouts before every
  574    item in the regex, and there's a new callout field that gives the position
  575    in the pattern - useful for debugging and tracing.
  576 
  577 2. The extra_data structure can now be used to pass in a set of character
  578    tables at exec time. This is useful if compiled regex are saved and re-used
  579    at a later time when the tables may not be at the same address. If the
  580    default internal tables are used, the pointer saved with the compiled
  581    pattern is now set to NULL, which means that you don't need to do anything
  582    special unless you are using custom tables.
  583 
  584 3. It is possible, with some restrictions on the content of the regex, to
  585    request "partial" matching. A special return code is given if all of the
  586    subject string matched part of the regex. This could be useful for testing
  587    an input field as it is being typed.
  588 
  589 4. There is now some optional support for Unicode character properties, which
  590    means that the patterns items such as \p{Lu} and \X can now be used. Only
  591    the general category properties are supported. If PCRE is compiled with this
  592    support, an additional 90K data structure is include, which increases the
  593    size of the library dramatically.
  594 
  595 5. There is support for saving compiled patterns and re-using them later.
  596 
  597 6. There is support for running regular expressions that were compiled on a
  598    different host with the opposite endianness.
  599 
  600 7. The pcretest program has been extended to accommodate the new features.
  601 
  602 The main internal rearrangement is that sequences of literal characters are no
  603 longer handled as strings. Instead, each character is handled on its own. This
  604 makes some UTF-8 handling easier, and makes the support of partial matching
  605 possible. Compiled patterns containing long literal strings will be larger as a
  606 result of this change; I hope that performance will not be much affected.
  607 
  608 
  609 Release 4.5 01-Dec-03
  610 ---------------------
  611 
  612 Again mainly a bug-fix and tidying release, with only a couple of new features:
  613 
  614 1. It's possible now to compile PCRE so that it does not use recursive
  615 function calls when matching. Instead it gets memory from the heap. This slows
  616 things down, but may be necessary on systems with limited stacks.
  617 
  618 2. UTF-8 string checking has been tightened to reject overlong sequences and to
  619 check that a starting offset points to the start of a character. Failure of the
  620 latter returns a new error code: PCRE_ERROR_BADUTF8_OFFSET.
  621 
  622 3. PCRE can now be compiled for systems that use EBCDIC code.
  623 
  624 
  625 Release 4.4 21-Aug-03
  626 ---------------------
  627 
  628 This is mainly a bug-fix and tidying release. The only new feature is that PCRE
  629 checks UTF-8 strings for validity by default. There is an option to suppress
  630 this, just in case anybody wants that teeny extra bit of performance.
  631 
  632 
  633 Releases 4.1 - 4.3
  634 ------------------
  635 
  636 Sorry, I forgot about updating the NEWS file for these releases. Please take a
  637 look at ChangeLog.
  638 
  639 
  640 Release 4.0 17-Feb-03
  641 ---------------------
  642 
  643 There have been a lot of changes for the 4.0 release, adding additional
  644 functionality and mending bugs. Below is a list of the highlights of the new
  645 functionality. For full details of these features, please consult the
  646 documentation. For a complete list of changes, see the ChangeLog file.
  647 
  648 1. Support for Perl's \Q...\E escapes.
  649 
  650 2. "Possessive quantifiers" ?+, *+, ++, and {,}+ which come from Sun's Java
  651 package. They provide some syntactic sugar for simple cases of "atomic
  652 grouping".
  653 
  654 3. Support for the \G assertion. It is true when the current matching position
  655 is at the start point of the match.
  656 
  657 4. A new feature that provides some of the functionality that Perl provides
  658 with (?{...}). The facility is termed a "callout". The way it is done in PCRE
  659 is for the caller to provide an optional function, by setting pcre_callout to
  660 its entry point. To get the function called, the regex must include (?C) at
  661 appropriate points.
  662 
  663 5. Support for recursive calls to individual subpatterns. This makes it really
  664 easy to get totally confused.
  665 
  666 6. Support for named subpatterns. The Python syntax (?P<name>...) is used to
  667 name a group.
  668 
  669 7. Several extensions to UTF-8 support; it is now fairly complete. There is an
  670 option for pcregrep to make it operate in UTF-8 mode.
  671 
  672 8. The single man page has been split into a number of separate man pages.
  673 These also give rise to individual HTML pages which are put in a separate
  674 directory. There is an index.html page that lists them all. Some hyperlinking
  675 between the pages has been installed.
  676 
  677 
  678 Release 3.5 15-Aug-01
  679 ---------------------
  680 
  681 1. The configuring system has been upgraded to use later versions of autoconf
  682 and libtool. By default it builds both a shared and a static library if the OS
  683 supports it. You can use --disable-shared or --disable-static on the configure
  684 command if you want only one of them.
  685 
  686 2. The pcretest utility is now installed along with pcregrep because it is
  687 useful for users (to test regexs) and by doing this, it automatically gets
  688 relinked by libtool. The documentation has been turned into a man page, so
  689 there are now .1, .txt, and .html versions in /doc.
  690 
  691 3. Upgrades to pcregrep:
  692    (i)   Added long-form option names like gnu grep.
  693    (ii)  Added --help to list all options with an explanatory phrase.
  694    (iii) Added -r, --recursive to recurse into sub-directories.
  695    (iv)  Added -f, --file to read patterns from a file.
  696 
  697 4. Added --enable-newline-is-cr and --enable-newline-is-lf to the configure
  698 script, to force use of CR or LF instead of \n in the source. On non-Unix
  699 systems, the value can be set in config.h.
  700 
  701 5. The limit of 200 on non-capturing parentheses is a _nesting_ limit, not an
  702 absolute limit. Changed the text of the error message to make this clear, and
  703 likewise updated the man page.
  704 
  705 6. The limit of 99 on the number of capturing subpatterns has been removed.
  706 The new limit is 65535, which I hope will not be a "real" limit.
  707 
  708 
  709 Release 3.3 01-Aug-00
  710 ---------------------
  711 
  712 There is some support for UTF-8 character strings. This is incomplete and
  713 experimental. The documentation describes what is and what is not implemented.
  714 Otherwise, this is just a bug-fixing release.
  715 
  716 
  717 Release 3.0 01-Feb-00
  718 ---------------------
  719 
  720 1. A "configure" script is now used to configure PCRE for Unix systems. It
  721 builds a Makefile, a config.h file, and the pcre-config script.
  722 
  723 2. PCRE is built as a shared library by default.
  724 
  725 3. There is support for POSIX classes such as [:alpha:].
  726 
  727 5. There is an experimental recursion feature.
  728 
  729 ----------------------------------------------------------------------------
  730           IMPORTANT FOR THOSE UPGRADING FROM VERSIONS BEFORE 2.00
  731 
  732 Please note that there has been a change in the API such that a larger
  733 ovector is required at matching time, to provide some additional workspace.
  734 The new man page has details. This change was necessary in order to support
  735 some of the new functionality in Perl 5.005.
  736 
  737           IMPORTANT FOR THOSE UPGRADING FROM VERSION 2.00
  738 
  739 Another (I hope this is the last!) change has been made to the API for the
  740 pcre_compile() function. An additional argument has been added to make it
  741 possible to pass over a pointer to character tables built in the current
  742 locale by pcre_maketables(). To use the default tables, this new argument
  743 should be passed as NULL.
  744 
  745           IMPORTANT FOR THOSE UPGRADING FROM VERSION 2.05
  746 
  747 Yet another (and again I hope this really is the last) change has been made
  748 to the API for the pcre_exec() function. An additional argument has been
  749 added to make it possible to start the match other than at the start of the
  750 subject string. This is important if there are lookbehinds. The new man
  751 page has the details, but you just want to convert existing programs, all
  752 you need to do is to stick in a new fifth argument to pcre_exec(), with a
  753 value of zero. For example, change
  754 
  755   pcre_exec(pattern, extra, subject, length, options, ovec, ovecsize)
  756 to
  757   pcre_exec(pattern, extra, subject, length, 0, options, ovec, ovecsize)
  758 
  759 ****