>>>
>>>You could allow parentheses in a url without allowing them in the part after the . ie not in .aspx
>>>
>>>
>>>I think that would solve it
>>
>>Nope. Consider (www.whatever.com).The dot is not a part of URL.
>
>
>What I'm saying is that parentheses are not allowed in the final .xxx here .com
>
>You can have www.what(ever).com but not www.whatever.c(o)m

The problem is, you cannot reliably determine what the final part is (where URL ends).