title: Validate mm/dd/yyyy with regEx
body: <p>Its not working. I don't know regEx, but I need use it.</p>
  
  <pre><code>if ($('input[name="due_date"]').val().match("^(0[1-9]|1[012])[- /.](0[1-9]|[12][0-9]|3[01])[- /.](19|20)\\d\\d$")) {
    $('input[name="due_date"]').after("&lt;span class='v_error'&gt;Must fill&lt;/span&gt;");
  }
  </code></pre>