title: Regular expression to match ID's and classes in CSS page
body: <p>I'm trying to analyze HTML code and extract all CSS classes and ID's from the source. So I need to extract whatever is between two quotation marks, which can be preceded by either class or id:  </p>
  
  <pre><code>id="&lt;extract this&gt;"
  
  class="&lt;extract this&gt;"
  </code></pre>