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

{
  "info" : {
    "version" : 1,
    "author" : "xcode"
  }
}