title: Remove non numeric characters except dash
body: <p>I need to remove all non numeric characters except the dash.
  This is my attempt (based on: <a href="https://stackoverflow.com/questions/14762120/regex-to-get-all-alpha-numeric-fields-except-for-comma-dash-and-single-quote">Regex to get all alpha numeric fields except for comma, dash and single quote</a>):</p>
  
  <pre><code>var stripped = mystring.replace(/[-0-9]+/g, '');
  </code></pre>
  
  <p>But that doesn't work :-(</p>