Text.Regex.TDFA.ReadRegex

This is a POSIX version of parseRegex that allows NUL characters. Lazy/Possessive/Backrefs are not recognized. Anchors ^ and $ are recognized.

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

Documentation

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

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.