How Can I Do Url Validation In Jquery?

<?php
echo $this->Html->css(array('jquery.validate'));
echo $this->Html->script(array('jquery.min.1.8.3','jquery.validate', 'jquery.validation.functions'));
?>

<script type="text/javascript">
    $(function() {
         
		$("#twitter").validate({
             expression: "if (VAL.match(/^(http(s)?:\/\/)?(www\.)?[a-z0-9]+([\-\.]{1}[a-z0-9]+)*\.[a-z]{2,5}(:[0-9]{1,5})?(\/.*)?$/)) return true; else return false;",
            message: "Should be a valid twitter link"
        });
		
	 	  
     });
	 </script>