title: domxpath regex wildcard
body: <p>I'm writing a PHP script to pull div id's that are incremented within their id
  example:</p>
  
  <pre><code>&lt;div id="tag_1"&gt;content&lt;/div&gt;
  &lt;div id="tag_2"&gt;content&lt;/div&gt;
  </code></pre>
  
  <p>so basically, how do I write query domxpath with a wildcard like so:</p>
  
  <pre><code>$nodes = $xpath-&gt;query("//div[@id='tag_.*']");
  </code></pre>