title: Custom Email Validation on ASP.NET C#
body: <p>I'm doing a registration form where people can register, in that I will be asking for thier email address's If i could put a <code>regex</code> validation that captures any other emails </p>
  
  <p>example: </p>
  
  <p><em><strong>xxx@gmail.com</em></strong>, or <strong><em>xxx@ yahoo.com</em></strong>, and only allow <strong><em>xxx@bat.ac.uk</em></strong> i could implement a system that sends an email to the registering person asking them to validate it. I know how to implement the email bit I'm just stuck at this validation part. hope this makes sense </p>
  
  <p>Is there a way to modify the default email validation expression </p>
  
  <blockquote>
    <p>\w+([-+.']\w+)@\w+([-.]\w+).\w+([-.]\w+)*</p>
  </blockquote>