title: Basic Regular Expression for a 'generic' phone number
body: <p>I need a regex (for use in an ASP .NET web site) to validate telephone numbers. Its supposed to be flexible and the only restrictions are:</p>
  
  <ul>
  <li>should be at least 9 digits</li>
  <li>no alphabetic letters</li>
  <li>can include Spaces, hyphens, a single (+)</li>
  </ul>
  
  <p>I have searched SO and Regexlib.com but i get expressions with more restrictions e.g. UK telephone or US etc.</p>