[Haskell-beginners] Attoparsec parser and maybe type

Hello, I have a type compose of 5 doubles data MyData = MyData Double Double Double Double Double now I have a file to parse whcih contain this | 1.0 2.0 3.0 4.0 5.0 | or | ---------no result ------------- | So I would like to create a parser which return a Maybe Mydata | 1.0 2.0 3.0 4.0 5.0 | -> Just MyData | ---------no result ------------- | -> Nothing How should I proceed I can write really trivially both parser but I do not know how to combine all this MyDataP1 = MyData <$> scientific <*> scientific NothingP = string "--------------- no result ----------------" Thanks for your help Frederic