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Update bundled PCRE2-library to version 10.23

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Some manual changes done to the library were lost with this update.
They will be added in the next commit.
This commit is contained in:
Esa Korhonen
2017-05-29 15:31:42 +03:00
parent 7231563937
commit 36af74cb25
218 changed files with 49218 additions and 26130 deletions
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42
pcre2/doc/html/pcre2compat.html
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@ -107,7 +107,7 @@ processed as anchored at the point where they are tested.
one that is backtracked onto acts. For example, in the pattern
A(*COMMIT)B(*PRUNE)C a failure in B triggers (*COMMIT), but a failure in C
triggers (*PRUNE). Perl's behaviour is more complex; in many cases it is the
same as PCRE2, but there are examples where it differs.
same as PCRE2, but there are cases where it differs.
</P>
<P>
11. Most backtracking verbs in assertions have their normal actions. They are
@ -123,7 +123,7 @@ the pattern /^(a(b)?)+$/ in Perl leaves $2 unset, but in PCRE2 it is set to
13. PCRE2's handling of duplicate subpattern numbers and duplicate subpattern
names is not as general as Perl's. This is a consequence of the fact the PCRE2
works internally just with numbers, using an external table to translate
between numbers and names. In particular, a pattern such as (?|(?&#60;a&#62;A)|(?&#60;b)B),
between numbers and names. In particular, a pattern such as (?|(?&#60;a&#62;A)|(?&#60;b&#62;B),
where the two capturing parentheses have the same number but different names,
is not supported, and causes an error at compile time. If it were allowed, it
would not be possible to distinguish which parentheses matched, because both
@ -131,10 +131,11 @@ names map to capturing subpattern number 1. To avoid this confusing situation,
an error is given at compile time.
</P>
<P>
14. Perl recognizes comments in some places that PCRE2 does not, for example,
between the ( and ? at the start of a subpattern. If the /x modifier is set,
Perl allows white space between ( and ? (though current Perls warn that this is
deprecated) but PCRE2 never does, even if the PCRE2_EXTENDED option is set.
14. Perl used to recognize comments in some places that PCRE2 does not, for
example, between the ( and ? at the start of a subpattern. If the /x modifier
is set, Perl allowed white space between ( and ? though the latest Perls give
an error (for a while it was just deprecated). There may still be some cases
where Perl behaves differently.
</P>
<P>
15. Perl, when in warning mode, gives warnings for character classes such as
@ -161,42 +162,47 @@ each alternative branch of a lookbehind assertion can match a different length
of string. Perl requires them all to have the same length.
<br>
<br>
(b) If PCRE2_DOLLAR_ENDONLY is set and PCRE2_MULTILINE is not set, the $
(b) From PCRE2 10.23, back references to groups of fixed length are supported
in lookbehinds, provided that there is no possibility of referencing a
non-unique number or name. Perl does not support backreferences in lookbehinds.
<br>
<br>
(c) If PCRE2_DOLLAR_ENDONLY is set and PCRE2_MULTILINE is not set, the $
meta-character matches only at the very end of the string.
<br>
<br>
(c) A backslash followed by a letter with no special meaning is faulted. (Perl
(d) A backslash followed by a letter with no special meaning is faulted. (Perl
can be made to issue a warning.)
<br>
<br>
(d) If PCRE2_UNGREEDY is set, the greediness of the repetition quantifiers is
(e) If PCRE2_UNGREEDY is set, the greediness of the repetition quantifiers is
inverted, that is, by default they are not greedy, but if followed by a
question mark they are.
<br>
<br>
(e) PCRE2_ANCHORED can be used at matching time to force a pattern to be tried
(f) PCRE2_ANCHORED can be used at matching time to force a pattern to be tried
only at the first matching position in the subject string.
<br>
<br>
(f) The PCRE2_NOTBOL, PCRE2_NOTEOL, PCRE2_NOTEMPTY, PCRE2_NOTEMPTY_ATSTART, and
(g) The PCRE2_NOTBOL, PCRE2_NOTEOL, PCRE2_NOTEMPTY, PCRE2_NOTEMPTY_ATSTART, and
PCRE2_NO_AUTO_CAPTURE options have no Perl equivalents.
<br>
<br>
(g) The \R escape sequence can be restricted to match only CR, LF, or CRLF
(h) The \R escape sequence can be restricted to match only CR, LF, or CRLF
by the PCRE2_BSR_ANYCRLF option.
<br>
<br>
(h) The callout facility is PCRE2-specific.
(i) The callout facility is PCRE2-specific.
<br>
<br>
(i) The partial matching facility is PCRE2-specific.
(j) The partial matching facility is PCRE2-specific.
<br>
<br>
(j) The alternative matching function (<b>pcre2_dfa_match()</b> matches in a
(k) The alternative matching function (<b>pcre2_dfa_match()</b> matches in a
different way and is not Perl-compatible.
<br>
<br>
(k) PCRE2 recognizes some special sequences such as (*CR) at the start of
(l) PCRE2 recognizes some special sequences such as (*CR) at the start of
a pattern that set overall options that cannot be changed within the pattern.
</P>
<br><b>
@ -214,9 +220,9 @@ Cambridge, England.
REVISION
</b><br>
<P>
Last updated: 15 March 2015
Last updated: 18 October 2016
<br>
Copyright &copy; 1997-2015 University of Cambridge.
Copyright &copy; 1997-2016 University of Cambridge.
<br>
<p>
Return to the <a href="index.html">PCRE2 index page</a>.