You might want to do s/\d/\\d/g before you do s/\w/\\w/g... \w includes \d. As for the process of generating regexes from strings, I don't go near it.

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Jeff[japhy]Pinyan: Perl, regex, and perl hacker, who'd like a (from-home) job
s++=END;++y(;-P)}y js++=;shajsj<++y(p-q)}?print:??;