var filter_email = /^[_a-zA-Z0-9\.\-]+@[a-zA-Z0-9\.\-]+\.[a-zA-Z]{2,5}$/;

var filter_phone = /^ ?\+?[0-9]{0,3} ?[0-9]{3} ?[0-9]{3} ?[0-9]{3} ?$/;

var numInt2   = /^[0-9]{1,2}$/;
var numInt4   = /^[0-9]{4}$/;