#9618: pcre2-10.30
-------------------------+-----------------------
Reporter: bdubbs@… | Owner: bdubbs@…
Type: enhancement | Status: assigned
Priority: normal | Milestone: 8.1
Component: BOOK | Version: SVN
Severity: normal | Resolution:
Keywords: |
-------------------------+-----------------------
Comment (by bdubbs@…):
Version 10.30 14-August-2017
1. The main interpreter, pcre2_match(), has been refactored into a new
version
that does not use recursive function calls (and therefore the system
stack) for
remembering backtracking positions. This makes --disable-stack-for-
recursion a
NOOP. The new implementation allows backtracking into recursive group
calls in
patterns, making it more compatible with Perl, and also fixes some
other
previously hard-to-do issues. For patterns that have a lot of
backtracking, the
heap is now used, and there is explicit limit on the amount, settable
by
pcre2_set_heap_limit() or (*LIMIT_HEAP=xxx). The "recursion limit" is
retained,
but is renamed as "depth limit" (though the old names remain for
compatibility).
There is also a change in the way callouts from pcre2_match() are
handled. The
offset_vector field in the callout block is no longer a pointer to the
actual ovector that was passed to the matching function in the match
data
block. Instead it points to an internal ovector of a size large enough
to hold
all possible captured substrings in the pattern.
2. The new option PCRE2_ENDANCHORED insists that a pattern match must end
at
the end of the subject.
3. The new option PCRE2_EXTENDED_MORE implements Perl's /xx feature, and
pcre2test is upgraded to support it. Setting within the pattern by
(?xx) is
also supported.
4. (?n) can be used to set PCRE2_NO_AUTO_CAPTURE, because Perl now has
this.
5. Additional compile options in the compile context are now available,
and the
first two are: PCRE2_EXTRA_ALLOW_SURROGATE_ESCAPES and
PCRE2_EXTRA_BAD_ESCAPE_IS LITERAL.
6. The newline type PCRE2_NEWLINE_NUL is now available.
7. The match limit value now also applies to pcre2_dfa_match() as there
are
patterns that can use up a lot of resources without necessarily
recursing very
deeply.
8. The option REG_PEND (a GNU extension) is now available for the POSIX
wrapper. Also there is a new option PCRE2_LITERAL which is used to
support
REG_NOSPEC.
9. PCRE2_EXTRA_MATCH_LINE and PCRE2_EXTRA_MATCH_WORD are implemented for
the
benefit of pcre2grep, and pcre2grep's -F, -w, and -x options are re-
implemented
using PCRE2_LITERAL, PCRE2_EXTRA_MATCH_WORD, and
PCRE2_EXTRA_MATCH_LINE. This
is tidier and also fixes some bugs.
10. The Unicode tables are upgraded from Unicode 8.0.0 to Unicode 10.0.0.
11. There are some experimental functions for converting foreign patterns
(globs and POSIX patterns) into PCRE2 patterns.
--
Ticket URL: <http://wiki.linuxfromscratch.org/blfs/ticket/9618#comment:3>
BLFS Trac <http://wiki.linuxfromscratch.org/blfs>
Beyond Linux From Scratch
--
http://lists.linuxfromscratch.org/listinfo/blfs-book
FAQ: http://www.linuxfromscratch.org/blfs/faq.html
Unsubscribe: See the above information page
