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http://bugs.exim.org/show_bug.cgi?id=812
Philip Hazel <ph10@???> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |INVALID
--- Comment #1 from Philip Hazel <ph10@???> 2009-02-22 19:57:51 ---
Although you say "other regular expressions do this", in fact, Perl does not (I
checked with Perl 5.008008). PCRE is "Perl-compatible"; it tries to do what
Perl does. Therefore, I do not think this is a bug. The Perl/PCRE behaviour
seems fine to me, in any case. \1 matches "what group 1 matched", but if group
1 was never used, it didn't match anything - which is not (IMHO) the same thing
as matching an empty string.
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