title: how to remove non-alphanumeric characters except \ / @ + -:, | #
body: <p>I have </p>
  
  <pre><code>import re
  
  cadena = re.sub('[^0-9a-zA-Z]+', '', cadena)
  </code></pre>
  
  <p>how to remove non-alphanumeric characters except this
  \ / @ + -:, | #</p>