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http://bugs.exim.org/show_bug.cgi?id=812 Summary: Unmatched optional groups do not match nothing when used as backreference Product: PCRE Version: 7.8 Platform: Other OS/Version: All Status: NEW Severity: bug Priority: medium Component: Code AssignedTo: [email protected] ReportedBy: [email protected] CC: [email protected] The regular expression b(a)?\1 matches "baa", but not "b". Other regular expression engines do this. A workaround is b(a)?(?(1)\1|). -- Configure bugmail: http://bugs.exim.org/userprefs.cgi?tab=email -- ## List details at http://lists.exim.org/mailman/listinfo/pcre-dev
