sed + search word with strings and replaced all word I want to create with `sed` the following: For example each word in the file that have the `ssss...` Should be replaced (all word) with target string as `gggg`. echo "duwdbnhb ssssssmnfkejfnei" | sed s'/ssssss*/gggg/g' duwdbnhb ggggmnfkejfnei should be: duwdbnhb gggg remark - string could be with couple of `s` strings ( for example `ss` or `sss` or `ssssss` ...) Example: echo "duwdbnhb sssmnfkejfnei" | sed s'/s*/gggg/g' duwdbnhb gggg example A echo "rf3 f34kf3ein3e ssghdwydgeug swswww ssswjdbuyhb" | sed s'/ss.*/gggg/' rf3 f34kf3ein3e gggg but should print that: rf3 f34kf3ein3e gggg swswww gggg example B echo "rf3 f34kf3ein3e ssghdwydgeug swswww ssswjdbuyhb" | sed s'/s.*/gggg/' rf3 f34kf3ein3e gggg but should print that: rf3 f34kf3ein3e gggg gggg gggg

If I understood correctly, you want to replace the each word beginning with 2 or more `s`-characters:


sed s'/ss[^[:blank:]]*/gggg/g'