https://bugs.exim.org/show_bug.cgi?id=2433
Bug ID: 2433
Summary: A regression by 1133 commit: A lookbehind after a
condition does not match
Product: PCRE
Version: N/A
Hardware: x86
URL: https://bugzilla.redhat.com/show_bug.cgi?id=1743863
OS: Linux
Status: NEW
Severity: bug
Priority: medium
Component: Code
Assignee: p...@hermes.cam.ac.uk
Reporter: ppi...@redhat.com
CC: pcre-dev@exim.org
A Fedora user noticed that this pcre2 commit 1133:
commit d70442f2c962ca816b8d03504a07e618c271a9fe
Author: ph10 <ph10@6239d852-aaf2-0410-a92c-79f79f948069>
Date: Tue Jul 16 15:06:21 2019 +0000
Fix lookbehind within lookahead within lookbehind misbehaviour bug.
git-svn-id: svn://vcs.exim.org/pcre2/code/trunk@1133
6239d852-aaf2-0410-a92c-79f79f948069
causes Julia test suite to fail. I reduced the test to this:
$ printf '%s\n%s\n' '/^(?<A>a)(?(<A>)b)((?<=b).*)$/' 'abc' | ./pcre2test
PCRE2 version 10.34-RC1 2019-04-22
/^(?<A>a)(?(<A>)b)((?<=b).*)$/
abc
No match
A commit before works as expected:
$ printf '%s\n%s\n' '/^(?<A>a)(?(<A>)b)((?<=b).*)$/' 'abc' | ./pcre2test
PCRE2 version 10.34-RC1 2019-04-22
/^(?<A>a)(?(<A>)b)((?<=b).*)$/
abc
0: abc
1: a
2: c
It looks like a lookbehind after a condition is the culprit. Because these
expressions work:
/^(?<A>a)b((?<=b).*)$/
abc
0: abc
1: a
2: c
/^(?<A>a)(?(<A>)b)(.*)$/
abc
0: abc
1: a
2: c
A full expression from the Julia test can bee seen at
<https://bugzilla.redhat.com/show_bug.cgi?id=1743863>.
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