title: preg: how to write a preg pattern to get domain name from an email?
body: <p>From an email address like <code>something@gmail.com</code> I want to fetch domain name <code>gmail.com</code>.
  i want to use that pattern on textbox value in Javascript.</p>
  
  <p>Pease suggest me an optimized and faster preg pattern for above requirement...</p>