Yes, but there is a point at which it's better to just hand-write some code which is equivalent to the automaton, rather than trying to use a regexp. This is w

Yes, but there is a point at which it's better to just hand-write some code which is equivalent to the automaton, rather than trying to use a regexp. This is what a proper email-validation regexp looks like: http://www.ex-parrot.com/pdw/Mail-RFC822-Address.html http://www.ex-parrot.com/pdw/Mail-RFC822-Address.html