title: Regular expression to extract URL from an HTML link
body: <p>I’m a newbie in Python. I’m learning regexes, but I need help here.</p>
  
  <p>Here comes the HTML source:</p>
  
  <pre><code>&lt;a href="http://www.ptop.se" target="_blank"&gt;http://www.ptop.se&lt;/a&gt;
  </code></pre>
  
  <p>I’m trying to code a tool that only prints out <code>http://ptop.se</code>. Can you help me please?</p>