title: IBAN Regex design
body: <p>Help me please to design Regex that will match all IBANs with all possible whitespaces. Because I've found that one, but it does not work with whitespaces.</p>
  
  <pre><code>[a-zA-Z]{2}[0-9]{2}[a-zA-Z0-9]{4}[0-9]{7}([a-zA-Z0-9]?){0,16}
  </code></pre>
  
  <p>I need at least that formats:</p>
  
  <pre><code>DE89 3704 0044 0532 0130 00
  AT61 1904 3002 3457 3201
  FR14 2004 1010 0505 0001 3
  </code></pre>