Actually obey POSIX rules in #'posix-string-match, don't ignore them. src/ChangeLog addition: 2012-04-25 Aidan Kehoe <kehoea@parhasard.net> * search.c (string_match_1): Actually use the POSIX argument here, pass it to compile_pattern(). Thank you for the bug report, Ilya Shlyakhter! tests/ChangeLog addition: 2012-04-25 Aidan Kehoe <kehoea@parhasard.net> * automated/regexp-tests.el: Check that #'posix-string-match actually returns the longest match; thank you Ilya Shlyakhter in jn1j8t$ujq$1@dough.gmane.org !