brief visit here so cant elaborate. regex - you can find some examples, of which some should answer yours, here http://dotnet.org.za/trivium/archive/200...
and here http://www.codeproject.com/dotnet/RegexT... (dotnet)

You might also check out the regular expression validator itself...it has a couple of "pre-built" formulas built in including an Internet email address, a US phone number and a few others. The other regex you're looking for are fairly simple: alpha only: [A-za-z], numeric only [0-9]. Length limits can be controlled by the text box control itself by setting the MaxLength property and if you want to make sure that the data entered in two fields is identical, you'll need to use the "Compare Validator" rather than a regex validator.

thanks