Re: [Haskell-cafe] Function to find a substring

El dom, 06-06-2010 a las 15:51 +0000, R J escribió:

What's an elegant definition of a Haskell function that takes two strings and returns "Nothing" in case the first string isn't a substring of the first, or "Just i", where i is the index number of the position within the first string where the second string begins?

import Data.List f a b = findIndex (a `isPrefixOf`) (tails b) Jürgen