正则表达式

用户名：var string = /^[a-zA-Z0-9_-]{4,16}$/;
密码：var string = /^.*(?=.{6,})(?=.*\d)(?=.*[A-Z])(?=.*[a-z])(?=.*[!@#$%^&*? ]).*$/;
email：var string = /^[a-zA-Z0-9_-]+@[a-zA-Z0-9_-]+(\.[a-zA-Z0-9_-]+)+$/;
身份证：var string = /(^\d{15}$)|(^\d{18}$)|(^\d{17}(\d|X|x)$)/;