title: How to extract a substring from a string in JavaScript?
body: <p>I have a string of the following format:</p>
  
  <pre><code>var str1="tag:youtube.com,2008:video:VrtMalb-XcQ";
  </code></pre>
  
  <p>From this I need to extract the last part i.e. <code>VrtMalb-XcQ</code>. How can I achieve this?</p>