title: Regex for description form input
body: <p>a textarea is a part of my form. The user has to write a little text and I want to validate this text. For now I am using the following regex:</p>
  
  <pre><code>/^[0-9a-zA-ZäöüÄÖÜ_\-']+$/
  </code></pre>
  
  <p>Although I have mentioned the äöüÄÖÜ in the regex it handles all words with äöü.. as invalid. Furthermore it does not accept empty spaces.</p>
  
  <p>Any ideas how to improve the regex?</p>