Annotation of embedaddon/pcre/NEWS, revision 1.1.1.3

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

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