:: [a] -> [a] -> Bool package:Cabal

isInfixOf :: Eq a => [a] -> [a] -> Bool
Cabal Distribution.Simple.Utils Distribution.Simple.Utils
The isInfixOf function takes two lists and returns True iff the first list is contained, wholly and intact, anywhere within the second. 
>>> isInfixOf "Haskell" "I really like Haskell."
True

>>> isInfixOf "Ial" "I really like Haskell."
False