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#!/bin/sh
grep "^\(f\(o\([^o]\|$\)\|\([^o]\|$\)\)\|[^f]\)*$"

Success #stdin #stdout 0.03s 5308KB

stdin

f, fo or barf
f
fo
barf
foo
'foo'
abdfoode
abdfode
abdfde
abcde
f

 
fo
foo
fooo
ofooa
ofo
ofoo

stdout

f, fo or barf
f
fo
barf
abdfode
abdfde
abcde
f

 
fo
ofo

https://ideone.com/kjO0J

language:

Bash (bash 5.0.3)

created:

visibility:

secret

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