The reason for your bug (in your Note:) is because when Perl is FIRST parsing your code, and it tries to determine where your regex starts and ends, it only looks for balanced square brackets. At that stage, it's not actually parsing your regex, just looking for its start and end. Thus, the square brackets IN the regex that aren't backslashed throw the parser off.

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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:??;

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