title: python extract id value from href source
body: <p>I've managed to extract the href URI's using beautifulsoup from the source of the page, however I now want to extract the UID value from multiple instances of the example below:</p>
  
  <p>e.g</p>
  
  <pre><code>&lt;a href="test.html?uid=5444974"&gt;
  &lt;a href="test.html?uid=5444972"&gt;
  &lt;a href="test.html?uid=54444972"&gt;
  </code></pre>
  
  <p>Help would be greatly appreciated!</p>