------ art_6277_16506322.1137465300265 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline I need to hack out an regular expression, which will match "SNPB" without matching "STR SNPB". Since ruby 1.8.2 or 1.8.4 don't support the lookbehind feature. what's the workable regular expression for ruby version 1.8.2? Thanks for any idea. Eric ------ art_6277_16506322.1137465300265--