title: regular expression accepting email from specific domain
body: <p>looking for regular expression for email which will accept
  email id from specific domain like 
  i want it to accept email only from org so valid emails will be</p>
  
  <pre><code>avc@gddf.org
  lmn@sdf.org
  sdfsdf@sdfsdf.org
  </code></pre>
  
  <p>It should not accept email other than .org 
  may i knw how it is possible</p>