title: get content between custom comment
body: <p>I have a html string. In that I defined some area for editing. That area enclosed in certain comment. I want to get all the content between that comment. For example</p>
  
  <pre><code>&lt;!--start--&gt; some content with any html tag &lt;!--end--&gt;
  </code></pre>
  
  <p>In the above example I need the content between the start and end tag. That is want </p>
  
  <p><code>some content with any html tag</code>.</p>
  
  <p>-Arun</p>