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Simple math with regular expressions?

A friend of mine (Ariel) made the bold claim that it is possible to write a regular expression (in today's languages such as .Net) that checks simple mathematical functions, for example if a number is divisible by 3. I looked and looked and asked and checked and could find no mention of this. I'm not talking theoretically; I'm looking for an example that shows me this. Can you provide one?

Why does the BorCon Israel Registration page have to suck?

Mitigating malicious plug-ins in your application