> > The 'st' is apparently equivalent to some ligature or some other UTF-8 > character, so you end up with an alternation of two different lengths, > which can't be used for look-behinds. > > Use a character set modifier /a to restrict the matching to ASCII rules. > Search for "Character set modifiers" in the perlre man page. > > So something like: > /(?<!Best )\bRegards,/aai > should do with perl >= 5.14 . > > Better yet, avoid lookbehinds. > > Mark >
Many thanks Marc - both suggestions solve my problem. -- Mike
