title: Include special characters like ö,ä,ü in regular expressions
body: <p>I have the following Regular Expression that does this:</p>
  
  <pre><code>pattern='^.*(?=.{8,})(?=.*[a-zA-Z])(?=.*\d).*$'
  </code></pre>
  
  <ul>
  <li>at least 8 characters</li>
  <li>at least 1 number</li>
  <li>at least 1 letter (upper or lower case)</li>
  </ul>
  
  <p>unfortunately, special characters like the german ä,ö,ü are not included, so patterns like <code>1234567ä</code> will fail.
  Does anyone know how to get them into this Expression? I guess that it should probably be in the <code>(?=.*[a-zA-Z])</code> section.
  Thank you in advance for your effort</p>