Check the docs for Data::FormValidator (ValidateRM uses D::FV profiles). You'll want to write your own constraint, it should be fairly straightforward once you decipher the docs.
To clarify the other recommendation, don't rely on client-side code, as the client can disable any such code. You can include it to avoid server work, but you'll want the code on the server just in case anyway.
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Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
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Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
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Want more info? How to link
or How to display code and escape characters
are good places to start.
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