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
[package]
name = "hwrunner"
version = "0.1.0"
authors = ["Hedgewars Project"]
edition = "2018"
[dependencies]
gfx = "0.17"
glutin = "0.18"
gfx_window_glutin = "0.26"
lib-hedgewars-engine = { path = "../lib-hedgewars-engine" }