sed -i -E "s/еж([аиу][^а-я])/ёжик\1/g" *ru* grep -E "еж[аиу][^а-я]" *ru* Comment: [^а-я] includes all spaces and punctuation and also finish of string

{-# LANGUAGE ImpredicativeTypes #-}
module Main where

import qualified MODULE as M

main = undefined $ M.FUNCTION PARAMETERS