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

     1

{

     2

  "info" : {

     3

    "version" : 1,

     4

    "author" : "xcode"

     5

  }

     6

}