HTML (and PerlMonks.org) supports the <xmp> tag, which displays all text and whitespace as is, up to the closing </xmp> tag. (That means you can't write a closing </xmp> tag in your text without it being caught.)

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Jeff[japhy]Pinyan: Perl, regex, and perl hacker.
s++=END;++y(;-P)}y js++=;shajsj<++y(p-q)}?print:??;