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437 lines
16 KiB
Plaintext
News about PCRE2 releases
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-------------------------
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Version 10.42 11-December-2022
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------------------------------
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This is an unexpectedly early release to fix a problem that was introduced in
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10.41. ChangeLog number 19 (GitHub #139) added the default definition of
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PCRE2_CALL_CONVENTION to pcre2posix.c instead of pcre2posix.h, which meant that
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programs including pcre2posix.h but not pcre2.h couldn't compile. A new test
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that checks this case has been added.
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A couple of other minor issues are also fixed, and a patch for an intermittent
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JIT fault is also included. See ChangeLog and the Git log.
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Version 10.41 06-December-2022
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------------------------------
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This is another mainly bug-fixing and code-tidying release. There is one
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significant upgrade to pcre2grep: it now behaves like GNU grep when matching
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more than one pattern and a later pattern matches at an earlier point in the
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subject when the matched substrings are being identified by colour or by
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offsets.
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Version 10.40 15-April-2022
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---------------------------
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This is mostly a bug-fixing and code-tidying release. However, there are some
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extensions to Unicode property handling:
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* Added support for Bidi_Class and a number of binary Unicode properties,
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including Bidi_Control.
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* A number of changes to script matching for \p and \P:
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(a) Script extensions for a character are now coded as a bitmap instead of
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a list of script numbers, which should be faster and does not need a
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loop.
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(b) Added the syntax \p{script:xxx} and \p{script_extensions:xxx} (synonyms
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sc and scx).
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(c) Changed \p{scriptname} from being the same as \p{sc:scriptname} to being
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the same as \p{scx:scriptname} because this change happened in Perl at
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release 5.26.
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(d) The standard Unicode 4-letter abbreviations for script names are now
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recognized.
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(e) In accordance with Unicode and Perl's "loose matching" rules, spaces,
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hyphens, and underscores are ignored in property names, which are then
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matched independent of case.
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As always, see ChangeLog for a list of all changes (also the Git log).
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Version 10.39 29-October-2021
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-----------------------------
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This release is happening soon after 10.38 because the bug fix is important.
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1. Fix incorrect detection of alternatives in first character search in JIT.
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2. Update to Unicode 14.0.0.
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3. Some code cleanups (see ChangeLog).
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Version 10.38 01-October-2021
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-----------------------------
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As well as some bug fixes and tidies (as always, see ChangeLog for details),
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the documentation is updated to list the new URLs, following the move of the
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source repository to GitHub and the mailing list to Google Groups.
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* The CMake build system can now build both static and shared libraries in one
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go.
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* Following Perl's lead, \K is now locked out in lookaround assertions by
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default, but an option is provided to re-enable the previous behaviour.
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Version 10.37 26-May-2021
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-------------------------
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A few more bug fixes and tidies. The only change of real note is the removal of
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the actual POSIX names regcomp etc. from the POSIX wrapper library because
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these have caused issues for some applications (see 10.33 #2 below).
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Version 10.36 04-December-2020
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------------------------------
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Again, mainly bug fixes and tidies. The only enhancements are the addition of
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GNU grep's -m (aka --max-count) option to pcre2grep, and also unifying the
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handling of substitution strings for both -O and callouts in pcre2grep, with
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the addition of $x{...} and $o{...} to allow for characters whose code points
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are greater than 255 in Unicode mode.
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NOTE: there is an outstanding issue with JIT support for MacOS on arm64
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hardware. For details, please see Bugzilla issue #2618.
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Version 10.35 15-April-2020
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---------------------------
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Bugfixes, tidies, and a few new enhancements.
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1. Capturing groups that contain recursive backreferences to themselves are no
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longer automatically atomic, because the restriction is no longer necessary
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as a result of the 10.30 restructuring.
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2. Several new options for pcre2_substitute().
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3. When Unicode is supported and PCRE2_UCP is set without PCRE2_UTF, Unicode
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character properties are used for upper/lower case computations on characters
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whose code points are greater than 127.
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4. The character tables (for low-valued characters) can now more easily be
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saved and restored in binary.
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5. Updated to Unicode 13.0.0.
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Version 10.34 21-November-2019
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------------------------------
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Another release with a few enhancements as well as bugfixes and tidies. The
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main new features are:
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1. There is now some support for matching in invalid UTF strings.
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2. Non-atomic positive lookarounds are implemented in the pcre2_match()
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interpreter, but not in JIT.
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3. Added two new functions: pcre2_get_match_data_size() and
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pcre2_maketables_free().
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4. Upgraded to Unicode 12.1.0.
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Version 10.33 16-April-2019
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---------------------------
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Yet more bugfixes, tidies, and a few enhancements, summarized here (see
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ChangeLog for the full list):
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1. Callouts from pcre2_substitute() are now available.
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2. The POSIX functions are now all called pcre2_regcomp() etc., with wrapper
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functions that use the standard POSIX names. However, in pcre2posix.h the POSIX
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names are defined as macros. This should help avoid linking with the wrong
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library in some environments, while still exporting the POSIX names for
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pre-existing programs that use them.
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3. Some new options:
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(a) PCRE2_EXTRA_ESCAPED_CR_IS_LF makes \r behave as \n.
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(b) PCRE2_EXTRA_ALT_BSUX enables support for ECMAScript 6's \u{hh...}
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construct.
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(c) PCRE2_COPY_MATCHED_SUBJECT causes a copy of a matched subject to be
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made, instead of just remembering a pointer.
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4. Some new Perl features:
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(a) Perl 5.28's experimental alphabetic names for atomic groups and
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lookaround assertions, for example, (*pla:...) and (*atomic:...).
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(b) The new Perl "script run" features (*script_run:...) and
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(*atomic_script_run:...) aka (*sr:...) and (*asr:...).
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(c) When PCRE2_UTF is set, allow non-ASCII letters and decimal digits in
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capture group names.
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5. --disable-percent-zt disables the use of %zu and %td in formatting strings
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in pcre2test. They were already automatically disabled for VC and older C
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compilers.
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6. Some changes related to callouts in pcre2grep:
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(a) Support for running an external program under VMS has been added, in
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addition to Windows and fork() support.
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(b) --disable-pcre2grep-callout-fork restricts the callout support in
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to the inbuilt echo facility.
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Version 10.32 10-September-2018
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-------------------------------
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This is another mainly bugfix and tidying release with a few minor
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enhancements. These are the main ones:
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1. pcre2grep now supports the inclusion of binary zeros in patterns that are
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read from files via the -f option.
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2. ./configure now supports --enable-jit=auto, which automatically enables JIT
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if the hardware supports it.
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3. In pcre2_dfa_match(), internal recursive calls no longer use the stack for
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local workspace and local ovectors. Instead, an initial block of stack is
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reserved, but if this is insufficient, heap memory is used. The heap limit
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parameter now applies to pcre2_dfa_match().
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4. Updated to Unicode version 11.0.0.
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5. (*ACCEPT:ARG), (*FAIL:ARG), and (*COMMIT:ARG) are now supported.
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6. Added support for \N{U+dddd}, but only in Unicode mode.
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7. Added support for (?^) to unset all imnsx options.
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Version 10.31 12-February-2018
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------------------------------
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This is mainly a bugfix and tidying release (see ChangeLog for full details).
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However, there are some minor enhancements.
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1. New pcre2_config() options: PCRE2_CONFIG_NEVER_BACKSLASH_C and
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PCRE2_CONFIG_COMPILED_WIDTHS.
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2. New pcre2_pattern_info() option PCRE2_INFO_EXTRAOPTIONS to retrieve the
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extra compile time options.
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3. There are now public names for all the pcre2_compile() error numbers.
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4. Added PCRE2_CALLOUT_STARTMATCH and PCRE2_CALLOUT_BACKTRACK bits to a new
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field callout_flags in callout blocks.
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Version 10.30 14-August-2017
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----------------------------
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The full list of changes that includes bugfixes and tidies is, as always, in
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ChangeLog. These are the most important new features:
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1. The main interpreter, pcre2_match(), has been refactored into a new version
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that does not use recursive function calls (and therefore the system stack) for
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remembering backtracking positions. This makes --disable-stack-for-recursion a
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NOOP. The new implementation allows backtracking into recursive group calls in
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patterns, making it more compatible with Perl, and also fixes some other
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previously hard-to-do issues. For patterns that have a lot of backtracking, the
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heap is now used, and there is an explicit limit on the amount, settable by
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pcre2_set_heap_limit() or (*LIMIT_HEAP=xxx). The "recursion limit" is retained,
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but is renamed as "depth limit" (though the old names remain for
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compatibility).
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There is also a change in the way callouts from pcre2_match() are handled. The
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offset_vector field in the callout block is no longer a pointer to the
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actual ovector that was passed to the matching function in the match data
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block. Instead it points to an internal ovector of a size large enough to hold
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all possible captured substrings in the pattern.
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2. The new option PCRE2_ENDANCHORED insists that a pattern match must end at
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the end of the subject.
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3. The new option PCRE2_EXTENDED_MORE implements Perl's /xx feature, and
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pcre2test is upgraded to support it. Setting within the pattern by (?xx) is
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also supported.
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4. (?n) can be used to set PCRE2_NO_AUTO_CAPTURE, because Perl now has this.
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5. Additional compile options in the compile context are now available, and the
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first two are: PCRE2_EXTRA_ALLOW_SURROGATE_ESCAPES and
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PCRE2_EXTRA_BAD_ESCAPE_IS_LITERAL.
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6. The newline type PCRE2_NEWLINE_NUL is now available.
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7. The match limit value now also applies to pcre2_dfa_match() as there are
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patterns that can use up a lot of resources without necessarily recursing very
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deeply.
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8. The option REG_PEND (a GNU extension) is now available for the POSIX
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wrapper. Also there is a new option PCRE2_LITERAL which is used to support
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REG_NOSPEC.
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9. PCRE2_EXTRA_MATCH_LINE and PCRE2_EXTRA_MATCH_WORD are implemented for the
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benefit of pcre2grep, and pcre2grep's -F, -w, and -x options are re-implemented
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using PCRE2_LITERAL, PCRE2_EXTRA_MATCH_WORD, and PCRE2_EXTRA_MATCH_LINE. This
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is tidier and also fixes some bugs.
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10. The Unicode tables are upgraded from Unicode 8.0.0 to Unicode 10.0.0.
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11. There are some experimental functions for converting foreign patterns
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(globs and POSIX patterns) into PCRE2 patterns.
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Version 10.23 14-February-2017
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------------------------------
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1. ChangeLog has the details of a lot of bug fixes and tidies.
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2. There has been a major re-factoring of the pcre2_compile.c file. Most syntax
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checking is now done in the pre-pass that identifies capturing groups. This has
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reduced the amount of duplication and made the code tidier. While doing this,
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some minor bugs and Perl incompatibilities were fixed (see ChangeLog for
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details.)
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3. Back references are now permitted in lookbehind assertions when there are
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no duplicated group numbers (that is, (?| has not been used), and, if the
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reference is by name, there is only one group of that name. The referenced
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group must, of course be of fixed length.
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4. \g{+<number>} (e.g. \g{+2} ) is now supported. It is a "forward back
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reference" and can be useful in repetitions (compare \g{-<number>} ). Perl does
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not recognize this syntax.
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5. pcre2grep now automatically expands its buffer up to a maximum set by
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--max-buffer-size.
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6. The -t option (grand total) has been added to pcre2grep.
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7. A new function called pcre2_code_copy_with_tables() exists to copy a
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compiled pattern along with a private copy of the character tables that is
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uses.
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8. A user supplied a number of patches to upgrade pcre2grep under Windows and
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tidy the code.
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9. Several updates have been made to pcre2test and test scripts (see
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ChangeLog).
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Version 10.22 29-July-2016
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--------------------------
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1. ChangeLog has the details of a number of bug fixes.
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2. The POSIX wrapper function regcomp() did not used to support back references
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and subroutine calls if called with the REG_NOSUB option. It now does.
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3. A new function, pcre2_code_copy(), is added, to make a copy of a compiled
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pattern.
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4. Support for string callouts is added to pcre2grep.
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5. Added the PCRE2_NO_JIT option to pcre2_match().
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6. The pcre2_get_error_message() function now returns with a negative error
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code if the error number it is given is unknown.
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7. Several updates have been made to pcre2test and test scripts (see
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ChangeLog).
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Version 10.21 12-January-2016
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-----------------------------
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1. Many bugs have been fixed. A large number of them were provoked only by very
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strange pattern input, and were discovered by fuzzers. Some others were
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discovered by code auditing. See ChangeLog for details.
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2. The Unicode tables have been updated to Unicode version 8.0.0.
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3. For Perl compatibility in EBCDIC environments, ranges such as a-z in a
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class, where both values are literal letters in the same case, omit the
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non-letter EBCDIC code points within the range.
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4. There have been a number of enhancements to the pcre2_substitute() function,
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giving more flexibility to replacement facilities. It is now also possible to
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cause the function to return the needed buffer size if the one given is too
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small.
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5. The PCRE2_ALT_VERBNAMES option causes the "name" parts of special verbs such
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as (*THEN:name) to be processed for backslashes and to take note of
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PCRE2_EXTENDED.
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6. PCRE2_INFO_HASBACKSLASHC makes it possible for a client to find out if a
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pattern uses \C, and --never-backslash-C makes it possible to compile a version
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PCRE2 in which the use of \C is always forbidden.
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7. A limit to the length of pattern that can be handled can now be set by
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calling pcre2_set_max_pattern_length().
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8. When matching an unanchored pattern, a match can be required to begin within
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a given number of code units after the start of the subject by calling
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pcre2_set_offset_limit().
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9. The pcre2test program has been extended to test new facilities, and it can
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now run the tests when LF on its own is not a valid newline sequence.
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10. The RunTest script has also been updated to enable more tests to be run.
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11. There have been some minor performance enhancements.
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Version 10.20 30-June-2015
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--------------------------
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1. Callouts with string arguments and the pcre2_callout_enumerate() function
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have been implemented.
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2. The PCRE2_NEVER_BACKSLASH_C option, which locks out the use of \C, is added.
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3. The PCRE2_ALT_CIRCUMFLEX option lets ^ match after a newline at the end of a
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subject in multiline mode.
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4. The way named subpatterns are handled has been refactored. The previous
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approach had several bugs.
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5. The handling of \c in EBCDIC environments has been changed to conform to the
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perlebcdic document. This is an incompatible change.
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6. Bugs have been mended, many of them discovered by fuzzers.
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Version 10.10 06-March-2015
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---------------------------
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1. Serialization and de-serialization functions have been added to the API,
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making it possible to save and restore sets of compiled patterns, though
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restoration must be done in the same environment that was used for compilation.
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2. The (*NO_JIT) feature has been added; this makes it possible for a pattern
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creator to specify that JIT is not to be used.
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3. A number of bugs have been fixed. In particular, bugs that caused building
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on Windows using CMake to fail have been mended.
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Version 10.00 05-January-2015
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-----------------------------
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Version 10.00 is the first release of PCRE2, a revised API for the PCRE
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library. Changes prior to 10.00 are logged in the ChangeLog file for the old
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API, up to item 20 for release 8.36. New programs are recommended to use the
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new library. Programs that use the original (PCRE1) API will need changing
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before linking with the new library.
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****
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