I would sincerely hope that you are not using the HTML input window to write ANY scripts in. Instead, you should be using an editor of greater repute, finally testing the script using any of numerous debugging techniques including perl -d and pasting to the HTML window between <code> tags.
If perlmonks.org had a built-in perl interpreter, there would be no reason to actually download it yourself except to do anything other than produce text output. I see this as horrendously wasteful and not particularly useful idea, so I frown upon it. Sorry.
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