Maybe if you told us what you *WANT* the users to enter it would be easier?
If you simply want to reject any entry that has *ONLY* (say) digits and spaces, then that's easy:
Function rejectStuff( txt )
Set re = New RegExp
re.Pattern = "[^\d\s]"
rejectStuff = re.Test( txt )
If rejectStuff( Request("someFormField") ) Then
... idiot user ...
... maybe okay? ...
But that would still allow something like "123-456-7890" because the "-" character is neither a digit nor a space.
It's much better to say what you are *expecting* (e.g., an email address??) than what you want to reject.