title: how to Validate multiple email addresses in single textfield using javascript or jquery
body: <p><a href="https://i.stack.imgur.com/5OH9j.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/5OH9j.png" alt="textfield"></a></p>
  
  <p><strong>Validation should match the following requirement.</strong></p>
  
  <ol>
  <li>Email id should be separated by comma and semicolon;</li>
  <li>Same email Id won't be repeated in the input field.</li>
  </ol>
  
  <p>the regular expression or find some other way to do it. </p>