title: Extract heading text from HTML text
body: <p>I have a <code>textarea</code> with <code>tinyMCE</code> text editor to make it RichTextEditor. I want to extract all heading(H1,H2 etc) text without style and formatting  . <br>
  Suppose that <code>txtEditor.InnerText</code> gives me value like below:</p>
  
  <pre><code>&lt;p&gt;&lt;span style="font-family: comic sans ms,sans-serif; color: #993366; font-size: large; background-color: #33cccc;"&gt;This is before heading one&lt;/span&gt;&lt;/p&gt;
  &lt;h1&gt;&lt;span style="font-family: comic sans ms,sans-serif; color: #993366;"&gt;Hello This is Headone&lt;/span&gt;&lt;/h1&gt;
  &lt;p&gt;this is before heading2&lt;/p&gt;
  &lt;h2&gt;This is heading2&lt;/h2&gt;
  </code></pre>
  
  <p>i want to get a list of heading tag's text only ? any kind of suggestion and guidance will be appreciated. </p>