title: How to remove entries from a nested list that are shorter than a given length
body: <p>I have a nested list with several sublists like this:</p>
  
  <pre><code>l = [
      ...
      ['22.06.2009', 'https://hoew.de/ha/xx']
      ...
      ]
  </code></pre>
  
  <p>But there also some entries like:</p>
  
  <pre><code>U= [
      ...
     ['22.06.2009', '/']
     ['22.06.2009', 'hiw']
     ...
     ]
  </code></pre>
  
  <p>Now I want to delete the sublists which have entries at the [1] index which are too short (less than 5 characters).</p>
  
  <p>How can I do this?</p>