I might add the "Difflist.txt" portion of your pattern will match Difflist.txt, Difflistntxt, or Difflist&txt. If you mean a literal dot, you either need to escape it or (as another poster did) put it into a character class. A character class is a grouping of possible characters you're looking for, surrounded by square brackets. [0-9.], for example, would look for any digit or the literal period.