execute :: Regex      -- ^ Compiled regular expression
        -> Rope -- ^ Rope to match against
        -> Either String (Maybe MatchArray)
execute r rope = Right (matchOnce r rope)
execute :: Regex      -- ^ Compiled regular expression
        -> Rope -- ^ Rope to match against
        -> Either String (Maybe MatchArray)
execute r rope = Right (matchOnce r rope)
execute r rope = Right (matchOnce r rope)