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