[html-formfu] How do I constrain a field that's not required?

Barry Hoggard bhoggard at gmail.com
Sat Sep 1 19:45:41 GMT 2007

I have a form with an optional URL field.  How do I constrain that to
be a valid URL, but only if the user enters something?  I don't want
it to be required.

Barry Hoggard

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