title: .NET regular expression
body: <p>How would I write a regular expression (C#) which will check a given string to see if any of its characters are characters OTHER than the following:</p>
  
  <blockquote>
    <p>a-z<br>
    A-Z<br>
    Æ æ Å å Ø ø - '</p>
  </blockquote>