Haskell - How can I use pure functions inside IO functions?

Question

How can I use pure functions inside IO functions? :-/

For example: I\'m reading a file (IO function) and I want to parse its context, a string, by using a pure funct

Answer 1

The actual answer is as follows:

main = do
  val <- return (purefunc ...arguments...)
  ...more..actions...

return wraps it in the appropriate monad so that do can assign it to val.