Jquery - RG mask

Question

I am having problems creating a mask with Jquery, because there are rg’s that close with the 'X' type'.

HTML

<input name="rg" class="form-control" id="rg" pattern="^(d{3}\.d{3}\.d{3}\-d{2}" max='11'>

Script

<script type="text/javascript">$(document).ready(function(){
  $("#rg").mask("999.999.999-99" || "999.999.999-a");});  
</script>

I cannot put the 'or' condition to accept more than one mask as an alternative.