After importing Text.Regex and Data.Maybe, here's some output from ghci: *ProtoRegexp> fromJust $ matchRegex (mkRegex "foo") "barfoobaz" [] *ProtoRegexp> fromJust $ matchRegexAll (mkRegex "foo") "barfoobaz" ("ba","foo","baz",[]) I'm relatively sure those are both wrong. I think the first should be "foo" and the second should be ("bar","foo","baz",[]) I haven't yet tried Text.Regex.Posix to see if the problem is just the wrapper. -- Shae Matijs Erisson - 2 days older than RFC0226 #haskell on irc.freenode.net - We Put the Funk in Funktion 10 PRINT "HELLO" 20 GOTO 10 ; putStr $ fix ("HELLO\n"++)