Hi,<BR><BR>I have found this page on the net:<BR><BR>http://forums.devshed.com/t96599/s.html<BR><BR>The last but one post seems to work for that guy, but it won't for me. I thought RegEx's were universal, so it shouldn't matter that he's using a different validator to what I am should it??? <BR>I have put it into a RegEX validator on my ASP.net page but no matter what I type into the box (in any of the formats which the original post on the above link asked for help on), seem to work.<BR><BR>Am I doing something wrong as this is the first time I have used a RegEX validator. Also, why does the validator accept a null value? I can't understand any of it.<BR><BR>Thanks very much.<BR><BR>P.S Shout if you want me to post code as I didn't know if this was neccessary.