8.6. RegexString: Regex matching made simple

(Simon Marlow supplied the String Regex wrapper.)

For simple regular expression operations, the Regex library is a little heavyweight. RegexString permits regex matching on ordinary Haskell Strings.

The datatypes and functions that RegexString provides are:

data Regex -- a compiled regular expression mkRegex :: String -- regexp to compile -> Regex -- compiled regexp matchRegex :: Regex -- compiled regexp -> String -- string to match -> Maybe [String] -- text of $1, $2, ... (if matched)