No. There are a couple of regex validator plugins out there (i.e. they won't let the user enter stuff that doesn't match a regex), but as I mentioned, they're not for OnDemand, you can't install them.
Also, you're not asking for a regex field, you're asking for something with auto-guess/correct. I'm afraid the same answer applies really (Except that I'm not aware of any plugins that might provide that function)
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