First, you want to use /\Q$line\E/. Second, why are you doing if (/$x/) { s/$x/$y/g } instead of the simpler s/$x/$y/g?

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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:??;