title: How to check whether an element name contains a specific string?
body: <p>The source document like this:</p>
  
  <pre><code>&lt;a&gt;
   &lt;b n=n1n1n1n1&gt;
   &lt;c1&gt; drftgy &lt;/c1&gt;
   &lt;/b&gt;
  &lt;c2&gt; dddd &lt;/c2&gt;
  &lt;/a&gt;
  </code></pre>
  
  <hr>
  
  <p>how to check if the element name = c then we will do something...</p>