Twitter Bootstrap comma-separated typeahead

gistfile1.html

<script type="text/javascript">
  jQuery(document).ready(function() {
    $('#autocomplete').typeahead({
      source: someDataSource

    , matcher: function (item) {
        queryItems = this.query.toLowerCase().split(/, */);
        queryLast = queryItems[queryItems.length-1];
        return ~item.toLowerCase().indexOf(queryLast)
      }
    , updater: function (item) {
        items = this.query.toLowerCase().split(/, */);
        items.pop();
        items.push(item);
        return items.join()
      }
    })
  });
</script>