title: remove hostname and port from url using regular expression
body: <p>I am trying to remove </p>
  
  <pre><code>http://localhost:7001/
  </code></pre>
  
  <p>part from</p>
  
  <pre><code>http://localhost:7001/www.facebook.com
  </code></pre>
  
  <p>to get the output as </p>
  
  <pre><code>www.facebook.com
  </code></pre>
  
  <p>what is the regular expression that i can use to achieve this exact pattern?</p>