Simple implementation of Regular Expressions, this example also uses a password TextMode
The following few are just default implementations of the Regular Expression approach above
Notice that the SSN implementation also uses the AjaxControlToolkit's MaskedEditExtender; or make your own mask:
Multiline (Required)
<formField:textBox ID="fftbSummary"
runat="server" Title="Summary"
TextMode="multiline" Required="true" />
All sorts of stuff going on in Date implementation