No one has mentioned that

$rx = "this|that|those";
/I want $rx/
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will match "I want this", "that", or "those". It looks like you want it to match "I want this", "I want that", or "I want those". You'll need parens.

$rx = "this|that|those";
/I want (?:$rx)/;
[download]

or qr//:

$rx = qr/this|that|those/;
/I want $rx/;
[download]

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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:??;