Air Canada Email Validation

aircanada_11112013.js

// http://help-aircanada.com/aircanada-help/js/aircanada_11112013.js

//This function is used to validate email address : Returns true if email is valid
	function isEmailValid(emailToValidate){
 		//var regex1=/^([_A-Za-z0-9-/&]+(\.[_A-Za-z0-9-/&]+)*@[A-Za-z0-9-]+(\.[A-Za-z0-9-]+)*\.(([A-Za-z]{2,3})|(aero|coop|info|museum)))?$/
 		//return regex1.test(emailToValidate);
		
		if (/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,17})+$/.test(emailToValidate))  
		  {  
		    return (true);
		  } 
		
		 		alert(document.getElementById('invalidemail').value);
		 	
		    //.alert("Please Enter A Valid EmailAddress as (abc@xyz.com)");  
		    return (false) ;	
 	}

Looks like the longest TLD is 17 characters http://en.wikipedia.org/wiki/List_of_Internet_top-level_domains