39 lines
1.5 KiB
Diff
39 lines
1.5 KiB
Diff
From 3e67484ef38a7c13619ea44f18047644d8f49dca Mon Sep 17 00:00:00 2001
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From: ph10 <ph10@6239d852-aaf2-0410-a92c-79f79f948069>
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Date: Sun, 23 Oct 2016 15:43:42 +0000
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Subject: [PATCH] Document current assert capture limitation.
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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git-svn-id: svn://vcs.exim.org/pcre2/code/trunk@575 6239d852-aaf2-0410-a92c-79f79f948069
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Petr Písař: Ported to 10.22.
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Signed-off-by: Petr Písař <ppisar@redhat.com>
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---
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doc/pcre2pattern.3 | 7 +++++++
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1 file changed, 7 insertions(+)
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diff --git a/doc/pcre2pattern.3 b/doc/pcre2pattern.3
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index 57b0014..3ca1088 100644
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--- a/doc/pcre2pattern.3
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+++ b/doc/pcre2pattern.3
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@@ -2219,6 +2219,13 @@ numbering the capturing subpatterns in the whole pattern. However, substring
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capturing is carried out only for positive assertions. (Perl sometimes, but not
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always, does do capturing in negative assertions.)
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.P
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+WARNING: If a positive assertion containing one or more capturing subpatterns
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+succeeds, but failure to match later in the pattern causes backtracking over
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+this assertion, the captures within the assertion are reset only if no higher
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+numbered captures are already set. This is, unfortunately, a fundamental
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+limitation of the current implementation; it may get removed in a future
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+reworking.
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+.P
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For compatibility with Perl, most assertion subpatterns may be repeated; though
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it makes no sense to assert the same thing several times, the side effect of
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capturing parentheses may occasionally be useful. However, an assertion that
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--
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2.7.4
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