regex-tdfa-1.1.8: Replaces/Enhances Text.Regex



This is a POSIX version of parseRegex that allows NUL characters. LazyPossessiveBackrefs are not recognized. Anchors ^ and $ are recognized.

The PGroup returned always have (Maybe GroupIndex) set to (Just _) and never to Nothing.



parseRegex :: String -> Either ParseError (Pattern, (GroupIndex, DoPa))Source

Return either an error message or a tuple of the Pattern and the largest group index and the largest DoPa index (both have smallest index of 1). Since the regular expression is supplied as [Char] it automatically supports unicode and '\NUL' characters.