title: Validation for AlphaNumeric and Line break
body: <p>On a text box I have to allow Alphanumeric characters with a enter key ( line break) so multilne message can be formed. What should be the regular expression to allow these keys ?
  Right now I use</p>
  
  <pre><code>@"^[A-Za-z0-9_ ()'-]+$" 
  </code></pre>
  
  <p>which doesn't allow enter key.</p>
  
  <p>Thanks</p>