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http://bugs.exim.org/show_bug.cgi?id=812 Philip Hazel <[email protected]> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution| |INVALID --- Comment #1 from Philip Hazel <[email protected]> 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. -- Configure bugmail: http://bugs.exim.org/userprefs.cgi?tab=email -- ## List details at http://lists.exim.org/mailman/listinfo/pcre-dev
