Huh? grep() in scalar context returns a number, not a join()ed list of elements that passed through. And print() doesn't "force scalar context" -- in fact, it invokes list context, which is the only reason why print invert($string) works.
_____________________________________________________
Jeff[japhy]Pinyan: Perl, regex, and perl hacker, who'd like a job (NYC-area)
s++=END;++y(;-P)}y js++=;shajsj<++y(p-q)}?print:??;

In reply to Re: Re: Re: Re:^2 Golf: string complement by japhy
in thread Golf: string complement by japhy

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