title: Regular Expression for delimited email address
body: <p>i am looking for a regular express to validate a list of email addresses like the following</p>
  
  <p><code>test1@abd.com;test.test@abc.com;test3@test.com</code></p>
  
  <p>and</p>
  
  <p><code>test1@abd.com;test.test@abc.com;test3@test.com;</code></p>
  
  <p>optional ";" at the end of the list.</p>
  
  <p>thanks,</p>