Annotation of embedaddon/pcre/NEWS, revision 1.1

1.1     ! misho       1: News about PCRE releases
        !             2: ------------------------
        !             3: 
        !             4: Release 8.21 12-Dec-2011
        !             5: ------------------------
        !             6: 
        !             7: This is almost entirely a bug-fix release. The only new feature is the ability
        !             8: to obtain the size of the memory used by the JIT compiler.
        !             9: 
        !            10: 
        !            11: Release 8.20 21-Oct-2011
        !            12: ------------------------
        !            13: 
        !            14: The main change in this release is the inclusion of Zoltan Herczeg's
        !            15: just-in-time compiler support, which can be accessed by building PCRE with
        !            16: --enable-jit. Large performance benefits can be had in many situations. 8.20
        !            17: also fixes an unfortunate bug that was introduced in 8.13 as well as tidying up
        !            18: a number of infelicities and differences from Perl.
        !            19: 
        !            20: 
        !            21: Release 8.13 16-Aug-2011
        !            22: ------------------------
        !            23: 
        !            24: This is mainly a bug-fix release. There has been a lot of internal refactoring.
        !            25: The Unicode tables have been updated. The only new feature in the library is
        !            26: the passing of *MARK information to callouts. Some additions have been made to
        !            27: pcretest to make testing easier and more comprehensive. There is a new option
        !            28: for pcregrep to adjust its internal buffer size.
        !            29: 
        !            30: 
        !            31: Release 8.12 15-Jan-2011
        !            32: ------------------------
        !            33: 
        !            34: This release fixes some bugs in pcregrep, one of which caused the tests to fail
        !            35: on 64-bit big-endian systems. There are no changes to the code of the library.
        !            36: 
        !            37: 
        !            38: Release 8.11 10-Dec-2010
        !            39: ------------------------
        !            40: 
        !            41: A number of bugs in the library and in pcregrep have been fixed. As always, see
        !            42: ChangeLog for details. The following are the non-bug-fix changes:
        !            43: 
        !            44: . Added --match-limit and --recursion-limit to pcregrep.
        !            45: 
        !            46: . Added an optional parentheses number to the -o and --only-matching options
        !            47:   of pcregrep.
        !            48: 
        !            49: . Changed the way PCRE_PARTIAL_HARD affects the matching of $, \z, \Z, \b, and
        !            50:   \B.
        !            51: 
        !            52: . Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
        !            53:   bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
        !            54: 
        !            55: . Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
        !            56:   START_OPTIMIZE option, which is now allowed at compile time
        !            57: 
        !            58: 
        !            59: Release 8.10 25-Jun-2010
        !            60: ------------------------
        !            61: 
        !            62: There are two major additions: support for (*MARK) and friends, and the option
        !            63: PCRE_UCP, which changes the behaviour of \b, \d, \s, and \w (and their
        !            64: opposites) so that they make use of Unicode properties. There are also a number
        !            65: of lesser new features, and several bugs have been fixed. A new option,
        !            66: --line-buffered, has been added to pcregrep, for use when it is connected to
        !            67: pipes.
        !            68: 
        !            69: 
        !            70: Release 8.02 19-Mar-2010
        !            71: ------------------------
        !            72: 
        !            73: Another bug-fix release.
        !            74: 
        !            75: 
        !            76: Release 8.01 19-Jan-2010
        !            77: ------------------------
        !            78: 
        !            79: This is a bug-fix release. Several bugs in the code itself and some bugs and
        !            80: infelicities in the build system have been fixed.
        !            81: 
        !            82: 
        !            83: Release 8.00 19-Oct-09
        !            84: ----------------------
        !            85: 
        !            86: Bugs have been fixed in the library and in pcregrep. There are also some
        !            87: enhancements. Restrictions on patterns used for partial matching have been
        !            88: removed, extra information is given for partial matches, the partial matching
        !            89: process has been improved, and an option to make a partial match override a
        !            90: full match is available. The "study" process has been enhanced by finding a
        !            91: lower bound matching length. Groups with duplicate numbers may now have
        !            92: duplicated names without the use of PCRE_DUPNAMES. However, they may not have
        !            93: different names. The documentation has been revised to reflect these changes.
        !            94: The version number has been expanded to 3 digits as it is clear that the rate
        !            95: of change is not slowing down.
        !            96: 
        !            97: 
        !            98: Release 7.9 11-Apr-09
        !            99: ---------------------
        !           100: 
        !           101: Mostly bugfixes and tidies with just a couple of minor functional additions.
        !           102: 
        !           103: 
        !           104: Release 7.8 05-Sep-08
        !           105: ---------------------
        !           106: 
        !           107: More bug fixes, plus a performance improvement in Unicode character property
        !           108: lookup.
        !           109: 
        !           110: 
        !           111: Release 7.7 07-May-08
        !           112: ---------------------
        !           113: 
        !           114: This is once again mainly a bug-fix release, but there are a couple of new
        !           115: features.
        !           116: 
        !           117: 
        !           118: Release 7.6 28-Jan-08
        !           119: ---------------------
        !           120: 
        !           121: The main reason for having this release so soon after 7.5 is because it fixes a
        !           122: potential buffer overflow problem in pcre_compile() when run in UTF-8 mode. In
        !           123: addition, the CMake configuration files have been brought up to date.
        !           124: 
        !           125: 
        !           126: Release 7.5 10-Jan-08
        !           127: ---------------------
        !           128: 
        !           129: This is mainly a bug-fix release. However the ability to link pcregrep with
        !           130: libz or libbz2 and the ability to link pcretest with libreadline have been
        !           131: added. Also the --line-offsets and --file-offsets options were added to
        !           132: pcregrep.
        !           133: 
        !           134: 
        !           135: Release 7.4 21-Sep-07
        !           136: ---------------------
        !           137: 
        !           138: The only change of specification is the addition of options to control whether
        !           139: \R matches any Unicode line ending (the default) or just CR, LF, and CRLF.
        !           140: Otherwise, the changes are bug fixes and a refactoring to reduce the number of
        !           141: relocations needed in a shared library. There have also been some documentation
        !           142: updates, in particular, some more information about using CMake to build PCRE
        !           143: has been added to the NON-UNIX-USE file.
        !           144: 
        !           145: 
        !           146: Release 7.3 28-Aug-07
        !           147: ---------------------
        !           148: 
        !           149: Most changes are bug fixes. Some that are not:
        !           150: 
        !           151: 1. There is some support for Perl 5.10's experimental "backtracking control
        !           152:    verbs" such as (*PRUNE).
        !           153: 
        !           154: 2. UTF-8 checking is now as per RFC 3629 instead of RFC 2279; this is more
        !           155:    restrictive in the strings it accepts.
        !           156: 
        !           157: 3. Checking for potential integer overflow has been made more dynamic, and as a
        !           158:    consequence there is no longer a hard limit on the size of a subpattern that
        !           159:    has a limited repeat count.
        !           160: 
        !           161: 4. When CRLF is a valid line-ending sequence, pcre_exec() and pcre_dfa_exec()
        !           162:    no longer advance by two characters instead of one when an unanchored match
        !           163:    fails at CRLF if there are explicit CR or LF matches within the pattern.
        !           164:    This gets rid of some anomalous effects that previously occurred.
        !           165: 
        !           166: 5. Some PCRE-specific settings for varying the newline options at the start of
        !           167:    a pattern have been added.
        !           168: 
        !           169: 
        !           170: Release 7.2 19-Jun-07
        !           171: ---------------------
        !           172: 
        !           173: WARNING: saved patterns that were compiled by earlier versions of PCRE must be
        !           174: recompiled for use with 7.2 (necessitated by the addition of \K, \h, \H, \v,
        !           175: and \V).
        !           176: 
        !           177: Correction to the notes for 7.1: the note about shared libraries for Windows is
        !           178: wrong. Previously, three libraries were built, but each could function
        !           179: independently. For example, the pcreposix library also included all the
        !           180: functions from the basic pcre library. The change is that the three libraries
        !           181: are no longer independent. They are like the Unix libraries. To use the
        !           182: pcreposix functions, for example, you need to link with both the pcreposix and
        !           183: the basic pcre library.
        !           184: 
        !           185: Some more features from Perl 5.10 have been added:
        !           186: 
        !           187:   (?-n) and (?+n) relative references for recursion and subroutines.
        !           188: 
        !           189:   (?(-n) and (?(+n) relative references as conditions.
        !           190: 
        !           191:   \k{name} and \g{name} are synonyms for \k<name>.
        !           192: 
        !           193:   \K to reset the start of the matched string; for example, (foo)\Kbar
        !           194:   matches bar preceded by foo, but only sets bar as the matched string.
        !           195: 
        !           196:   (?| introduces a group where the capturing parentheses in each alternative
        !           197:   start from the same number; for example, (?|(abc)|(xyz)) sets capturing
        !           198:   parentheses number 1 in both cases.
        !           199: 
        !           200:   \h, \H, \v, \V match horizontal and vertical whitespace, respectively.
        !           201: 
        !           202: 
        !           203: Release 7.1 24-Apr-07
        !           204: ---------------------
        !           205: 
        !           206: There is only one new feature in this release: a linebreak setting of
        !           207: PCRE_NEWLINE_ANYCRLF. It is a cut-down version of PCRE_NEWLINE_ANY, which
        !           208: recognizes only CRLF, CR, and LF as linebreaks.
        !           209: 
        !           210: A few bugs are fixed (see ChangeLog for details), but the major change is a
        !           211: complete re-implementation of the build system. This now has full Autotools
        !           212: support and so is now "standard" in some sense. It should help with compiling
        !           213: PCRE in a wide variety of environments.
        !           214: 
        !           215: NOTE: when building shared libraries for Windows, three dlls are now built,
        !           216: called libpcre, libpcreposix, and libpcrecpp. Previously, everything was
        !           217: included in a single dll.
        !           218: 
        !           219: Another important change is that the dftables auxiliary program is no longer
        !           220: compiled and run at "make" time by default. Instead, a default set of character
        !           221: tables (assuming ASCII coding) is used. If you want to use dftables to generate
        !           222: the character tables as previously, add --enable-rebuild-chartables to the
        !           223: "configure" command. You must do this if you are compiling PCRE to run on a
        !           224: system that uses EBCDIC code.
        !           225: 
        !           226: There is a discussion about character tables in the README file. The default is
        !           227: not to use dftables so that that there is no problem when cross-compiling.
        !           228: 
        !           229: 
        !           230: Release 7.0 19-Dec-06
        !           231: ---------------------
        !           232: 
        !           233: This release has a new major number because there have been some internal
        !           234: upheavals to facilitate the addition of new optimizations and other facilities,
        !           235: and to make subsequent maintenance and extension easier. Compilation is likely
        !           236: to be a bit slower, but there should be no major effect on runtime performance.
        !           237: Previously compiled patterns are NOT upwards compatible with this release. If
        !           238: you have saved compiled patterns from a previous release, you will have to
        !           239: re-compile them. Important changes that are visible to users are:
        !           240: 
        !           241: 1. The Unicode property tables have been updated to Unicode 5.0.0, which adds
        !           242:    some more scripts.
        !           243: 
        !           244: 2. The option PCRE_NEWLINE_ANY causes PCRE to recognize any Unicode newline
        !           245:    sequence as a newline.
        !           246: 
        !           247: 3. The \R escape matches a single Unicode newline sequence as a single unit.
        !           248: 
        !           249: 4. New features that will appear in Perl 5.10 are now in PCRE. These include
        !           250:    alternative Perl syntax for named parentheses, and Perl syntax for
        !           251:    recursion.
        !           252: 
        !           253: 5. The C++ wrapper interface has been extended by the addition of a
        !           254:    QuoteMeta function and the ability to allow copy construction and
        !           255:    assignment.
        !           256: 
        !           257: For a complete list of changes, see the ChangeLog file.
        !           258: 
        !           259: 
        !           260: Release 6.7 04-Jul-06
        !           261: ---------------------
        !           262: 
        !           263: The main additions to this release are the ability to use the same name for
        !           264: multiple sets of parentheses, and support for CRLF line endings in both the
        !           265: library and pcregrep (and in pcretest for testing).
        !           266: 
        !           267: Thanks to Ian Taylor, the stack usage for many kinds of pattern has been
        !           268: significantly reduced for certain subject strings.
        !           269: 
        !           270: 
        !           271: Release 6.5 01-Feb-06
        !           272: ---------------------
        !           273: 
        !           274: Important changes in this release:
        !           275: 
        !           276: 1. A number of new features have been added to pcregrep.
        !           277: 
        !           278: 2. The Unicode property tables have been updated to Unicode 4.1.0, and the
        !           279:    supported properties have been extended with script names such as "Arabic",
        !           280:    and the derived properties "Any" and "L&". This has necessitated a change to
        !           281:    the interal format of compiled patterns. Any saved compiled patterns that
        !           282:    use \p or \P must be recompiled.
        !           283: 
        !           284: 3. The specification of recursion in patterns has been changed so that all
        !           285:    recursive subpatterns are automatically treated as atomic groups. Thus, for
        !           286:    example, (?R) is treated as if it were (?>(?R)). This is necessary because
        !           287:    otherwise there are situations where recursion does not work.
        !           288: 
        !           289: See the ChangeLog for a complete list of changes, which include a number of bug
        !           290: fixes and tidies.
        !           291: 
        !           292: 
        !           293: Release 6.0 07-Jun-05
        !           294: ---------------------
        !           295: 
        !           296: The release number has been increased to 6.0 because of the addition of several
        !           297: major new pieces of functionality.
        !           298: 
        !           299: A new function, pcre_dfa_exec(), which implements pattern matching using a DFA
        !           300: algorithm, has been added. This has a number of advantages for certain cases,
        !           301: though it does run more slowly, and lacks the ability to capture substrings. On
        !           302: the other hand, it does find all matches, not just the first, and it works
        !           303: better for partial matching. The pcrematching man page discusses the
        !           304: differences.
        !           305: 
        !           306: The pcretest program has been enhanced so that it can make use of the new
        !           307: pcre_dfa_exec() matching function and the extra features it provides.
        !           308: 
        !           309: The distribution now includes a C++ wrapper library. This is built
        !           310: automatically if a C++ compiler is found. The pcrecpp man page discusses this
        !           311: interface.
        !           312: 
        !           313: The code itself has been re-organized into many more files, one for each
        !           314: function, so it no longer requires everything to be linked in when static
        !           315: linkage is used. As a consequence, some internal functions have had to have
        !           316: their names exposed. These functions all have names starting with _pcre_. They
        !           317: are undocumented, and are not intended for use by outside callers.
        !           318: 
        !           319: The pcregrep program has been enhanced with new functionality such as
        !           320: multiline-matching and options for output more matching context. See the
        !           321: ChangeLog for a complete list of changes to the library and the utility
        !           322: programs.
        !           323: 
        !           324: 
        !           325: Release 5.0 13-Sep-04
        !           326: ---------------------
        !           327: 
        !           328: The licence under which PCRE is released has been changed to the more
        !           329: conventional "BSD" licence.
        !           330: 
        !           331: In the code, some bugs have been fixed, and there are also some major changes
        !           332: in this release (which is why I've increased the number to 5.0). Some changes
        !           333: are internal rearrangements, and some provide a number of new facilities. The
        !           334: new features are:
        !           335: 
        !           336: 1. There's an "automatic callout" feature that inserts callouts before every
        !           337:    item in the regex, and there's a new callout field that gives the position
        !           338:    in the pattern - useful for debugging and tracing.
        !           339: 
        !           340: 2. The extra_data structure can now be used to pass in a set of character
        !           341:    tables at exec time. This is useful if compiled regex are saved and re-used
        !           342:    at a later time when the tables may not be at the same address. If the
        !           343:    default internal tables are used, the pointer saved with the compiled
        !           344:    pattern is now set to NULL, which means that you don't need to do anything
        !           345:    special unless you are using custom tables.
        !           346: 
        !           347: 3. It is possible, with some restrictions on the content of the regex, to
        !           348:    request "partial" matching. A special return code is given if all of the
        !           349:    subject string matched part of the regex. This could be useful for testing
        !           350:    an input field as it is being typed.
        !           351: 
        !           352: 4. There is now some optional support for Unicode character properties, which
        !           353:    means that the patterns items such as \p{Lu} and \X can now be used. Only
        !           354:    the general category properties are supported. If PCRE is compiled with this
        !           355:    support, an additional 90K data structure is include, which increases the
        !           356:    size of the library dramatically.
        !           357: 
        !           358: 5. There is support for saving compiled patterns and re-using them later.
        !           359: 
        !           360: 6. There is support for running regular expressions that were compiled on a
        !           361:    different host with the opposite endianness.
        !           362: 
        !           363: 7. The pcretest program has been extended to accommodate the new features.
        !           364: 
        !           365: The main internal rearrangement is that sequences of literal characters are no
        !           366: longer handled as strings. Instead, each character is handled on its own. This
        !           367: makes some UTF-8 handling easier, and makes the support of partial matching
        !           368: possible. Compiled patterns containing long literal strings will be larger as a
        !           369: result of this change; I hope that performance will not be much affected.
        !           370: 
        !           371: 
        !           372: Release 4.5 01-Dec-03
        !           373: ---------------------
        !           374: 
        !           375: Again mainly a bug-fix and tidying release, with only a couple of new features:
        !           376: 
        !           377: 1. It's possible now to compile PCRE so that it does not use recursive
        !           378: function calls when matching. Instead it gets memory from the heap. This slows
        !           379: things down, but may be necessary on systems with limited stacks.
        !           380: 
        !           381: 2. UTF-8 string checking has been tightened to reject overlong sequences and to
        !           382: check that a starting offset points to the start of a character. Failure of the
        !           383: latter returns a new error code: PCRE_ERROR_BADUTF8_OFFSET.
        !           384: 
        !           385: 3. PCRE can now be compiled for systems that use EBCDIC code.
        !           386: 
        !           387: 
        !           388: Release 4.4 21-Aug-03
        !           389: ---------------------
        !           390: 
        !           391: This is mainly a bug-fix and tidying release. The only new feature is that PCRE
        !           392: checks UTF-8 strings for validity by default. There is an option to suppress
        !           393: this, just in case anybody wants that teeny extra bit of performance.
        !           394: 
        !           395: 
        !           396: Releases 4.1 - 4.3
        !           397: ------------------
        !           398: 
        !           399: Sorry, I forgot about updating the NEWS file for these releases. Please take a
        !           400: look at ChangeLog.
        !           401: 
        !           402: 
        !           403: Release 4.0 17-Feb-03
        !           404: ---------------------
        !           405: 
        !           406: There have been a lot of changes for the 4.0 release, adding additional
        !           407: functionality and mending bugs. Below is a list of the highlights of the new
        !           408: functionality. For full details of these features, please consult the
        !           409: documentation. For a complete list of changes, see the ChangeLog file.
        !           410: 
        !           411: 1. Support for Perl's \Q...\E escapes.
        !           412: 
        !           413: 2. "Possessive quantifiers" ?+, *+, ++, and {,}+ which come from Sun's Java
        !           414: package. They provide some syntactic sugar for simple cases of "atomic
        !           415: grouping".
        !           416: 
        !           417: 3. Support for the \G assertion. It is true when the current matching position
        !           418: is at the start point of the match.
        !           419: 
        !           420: 4. A new feature that provides some of the functionality that Perl provides
        !           421: with (?{...}). The facility is termed a "callout". The way it is done in PCRE
        !           422: is for the caller to provide an optional function, by setting pcre_callout to
        !           423: its entry point. To get the function called, the regex must include (?C) at
        !           424: appropriate points.
        !           425: 
        !           426: 5. Support for recursive calls to individual subpatterns. This makes it really
        !           427: easy to get totally confused.
        !           428: 
        !           429: 6. Support for named subpatterns. The Python syntax (?P<name>...) is used to
        !           430: name a group.
        !           431: 
        !           432: 7. Several extensions to UTF-8 support; it is now fairly complete. There is an
        !           433: option for pcregrep to make it operate in UTF-8 mode.
        !           434: 
        !           435: 8. The single man page has been split into a number of separate man pages.
        !           436: These also give rise to individual HTML pages which are put in a separate
        !           437: directory. There is an index.html page that lists them all. Some hyperlinking
        !           438: between the pages has been installed.
        !           439: 
        !           440: 
        !           441: Release 3.5 15-Aug-01
        !           442: ---------------------
        !           443: 
        !           444: 1. The configuring system has been upgraded to use later versions of autoconf
        !           445: and libtool. By default it builds both a shared and a static library if the OS
        !           446: supports it. You can use --disable-shared or --disable-static on the configure
        !           447: command if you want only one of them.
        !           448: 
        !           449: 2. The pcretest utility is now installed along with pcregrep because it is
        !           450: useful for users (to test regexs) and by doing this, it automatically gets
        !           451: relinked by libtool. The documentation has been turned into a man page, so
        !           452: there are now .1, .txt, and .html versions in /doc.
        !           453: 
        !           454: 3. Upgrades to pcregrep:
        !           455:    (i)   Added long-form option names like gnu grep.
        !           456:    (ii)  Added --help to list all options with an explanatory phrase.
        !           457:    (iii) Added -r, --recursive to recurse into sub-directories.
        !           458:    (iv)  Added -f, --file to read patterns from a file.
        !           459: 
        !           460: 4. Added --enable-newline-is-cr and --enable-newline-is-lf to the configure
        !           461: script, to force use of CR or LF instead of \n in the source. On non-Unix
        !           462: systems, the value can be set in config.h.
        !           463: 
        !           464: 5. The limit of 200 on non-capturing parentheses is a _nesting_ limit, not an
        !           465: absolute limit. Changed the text of the error message to make this clear, and
        !           466: likewise updated the man page.
        !           467: 
        !           468: 6. The limit of 99 on the number of capturing subpatterns has been removed.
        !           469: The new limit is 65535, which I hope will not be a "real" limit.
        !           470: 
        !           471: 
        !           472: Release 3.3 01-Aug-00
        !           473: ---------------------
        !           474: 
        !           475: There is some support for UTF-8 character strings. This is incomplete and
        !           476: experimental. The documentation describes what is and what is not implemented.
        !           477: Otherwise, this is just a bug-fixing release.
        !           478: 
        !           479: 
        !           480: Release 3.0 01-Feb-00
        !           481: ---------------------
        !           482: 
        !           483: 1. A "configure" script is now used to configure PCRE for Unix systems. It
        !           484: builds a Makefile, a config.h file, and the pcre-config script.
        !           485: 
        !           486: 2. PCRE is built as a shared library by default.
        !           487: 
        !           488: 3. There is support for POSIX classes such as [:alpha:].
        !           489: 
        !           490: 5. There is an experimental recursion feature.
        !           491: 
        !           492: ----------------------------------------------------------------------------
        !           493:           IMPORTANT FOR THOSE UPGRADING FROM VERSIONS BEFORE 2.00
        !           494: 
        !           495: Please note that there has been a change in the API such that a larger
        !           496: ovector is required at matching time, to provide some additional workspace.
        !           497: The new man page has details. This change was necessary in order to support
        !           498: some of the new functionality in Perl 5.005.
        !           499: 
        !           500:           IMPORTANT FOR THOSE UPGRADING FROM VERSION 2.00
        !           501: 
        !           502: Another (I hope this is the last!) change has been made to the API for the
        !           503: pcre_compile() function. An additional argument has been added to make it
        !           504: possible to pass over a pointer to character tables built in the current
        !           505: locale by pcre_maketables(). To use the default tables, this new arguement
        !           506: should be passed as NULL.
        !           507: 
        !           508:           IMPORTANT FOR THOSE UPGRADING FROM VERSION 2.05
        !           509: 
        !           510: Yet another (and again I hope this really is the last) change has been made
        !           511: to the API for the pcre_exec() function. An additional argument has been
        !           512: added to make it possible to start the match other than at the start of the
        !           513: subject string. This is important if there are lookbehinds. The new man
        !           514: page has the details, but you just want to convert existing programs, all
        !           515: you need to do is to stick in a new fifth argument to pcre_exec(), with a
        !           516: value of zero. For example, change
        !           517: 
        !           518:   pcre_exec(pattern, extra, subject, length, options, ovec, ovecsize)
        !           519: to
        !           520:   pcre_exec(pattern, extra, subject, length, 0, options, ovec, ovecsize)
        !           521: 
        !           522: ****

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