How to split a string in Haskell?

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Remember that you can look up the definition of Prelude functions!

http://www.haskell.org/onlinereport/standard-prelude.html

Looking there, the definition of words is,

words   :: String -> [String]
words s =  case dropWhile Char.isSpace s of
                      "" -> []
                      s' -> w : words s''
                            where (w, s'') = break Char.isSpace s'

So, change it for a function that takes a predicate:

wordsWhen     :: (Char -> Bool) -> String -> [String]
wordsWhen p s =  case dropWhile p s of
                      "" -> []
                      s' -> w : wordsWhen p s''
                            where (w, s'') = break p s'

Then call it with whatever predicate you want!

main = print $ wordsWhen (==',') "break,this,string,at,commas"

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