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lang-bash
worlds tootherworldly- is what it does then correct? You'd also get some interesting results given various input if your target string contained regexp metachars since it's doing a partial regexp comparison when you should really be doing a full word string comparison. Are the constructs being used all POSIX-compliant or are some GNU extensions? Does that matter? I've been using sed for 40 years and couldn't answer that because I'd never use it for a task like this.