title: Match product dimensions with regular expression
body: <p>I am trying to match length width and height with a regular expression.</p>
  
  <p>I have the following cases</p>
  
  <pre><code>Artikelgewicht3,7 Kg
  Produktabmessungen60,4 x 46,5 x 42 cm
  
  or
  
  Artikelgewicht3,7 Kg
  Produktabmessungen60 x 46 x 42
  
  or
  
  Artikelgewicht3,7 Kg
  Produktabmessungen60 x 46
  </code></pre>
  
  <p>The second case can be matched with <code>(\d+) x (\d+) x (\d+)</code>, which works fine.</p>
  
  <p>I further tried to match the first and the third case with <code>(\d+)(\\,\d+)? x (\d+)(\\,\d+)? x (\d+)(\\,\d+)?</code>.</p>
  
  <p>Any suggestions what I am doing wrong?</p>