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 = "vec2d"
version = "0.1.0"
authors = ["Andrey Korotaev <a.korotaev@hedgewars.org>"]
edition = "2018"
[dependencies]
integral-geometry = { path = "../integral-geometry" }