https://bugs.exim.org/show_bug.cgi?id=2182
Philip Hazel <ph10@???> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |WONTFIX
Status|NEW |RESOLVED
--- Comment #3 from Philip Hazel <ph10@???> ---
Your examples do work as expected in PCRE2 release 10.30:
PCRE2 version 10.31-RC1 2017-09-12
/^(?:(?=(\1?+a))(?=aaa$).){1,2}/
aaa
0: a
1: a
/^a(?:(?<=(.))[^c])*c/
abc
0: abc
1: a
They do appear to be broken in PCRE1 and I think this is a duplicate of #1887,
which says this: "Somehow, when declaring a capturing group inside an
assertion, the capturing group isn't reset when backtracking." The Change Log
for PCRE2 release 10.30 says this: "The main interpreter, pcre2_match(), has
been refactored into a new version that does not use recursive function calls
(and therefore the 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 hard-to-do issues such as #1887 in
Bugzilla."
PCRE1 (the 8.xx series) is obsolescent (PCRE2 has been out nearly 3 years now)
and I'm afraid that only straightforward issues will now get fixed in PCRE1.
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