title: Extract email address(s) from string using regular expression
body: <p>I have a requirement such that I have some text as under</p>
  
  <pre><code>Hello 
  How r u
  Email: mail3456@gg.com
  Another email is aaa@zz.com
  And not a valid email as invalid@.com
  </code></pre>
  
  <p>It is a string and what I have to do is that , i need to find out whether any email address is present in the string. If so i need to extract that.</p>
  
  <p>Please note that there can be multiple email addresses in the string.</p>
  
  <p>Is it possible to do so using regular exprerssion. </p>
  
  <p>Thanks</p>