title: RegEx - allow whitespace at end of the string
body: <p>I have this patterns:</p>
  
  <pre><code>^\s*(?=\d*(-\d*){0,2}$)(?=(\d-*){13}$).*$
  </code></pre>
  
  <p>allows strings like "114-4316191466" or "1144316191466" " 1144316191466".
  I'd like to allow whitespace also at the end. Best way to do that?</p>
  
  <p>Thanks</p>