表单验证 增加regex 正则表达式(密码必须为字母和数字的组合)

密码为子母和数字的组合验证:
关键点 regex: /^(?![0-9]+$)(?![a-zA-Z]+$)[0-9A-Za-z]{6,20}$/  
(?!xxxx) 是正则表达式的负向零宽断言一种形式，标识预该位置后不是xxxx字符。
给validator插件添加自定义正则表达式验证方法$.validator.addMethod

Js代码 

$(function(){
        $.validator.addMethod("regex", function(value, element, regexpr) {          
            return regexpr.test(value);
          }, "Please enter a valid pasword.");   //增加regex正则表达式验证
    
	$("#thirdForm").validate({
		rules: {
			customerUsername: {
				required: true,
				rangelength: [6, 20],
				remote: {
					url: "checkUserExists.htm",
					type: "post",
					data: {"userName": function(){return $("#customerUsername").val();}}
				}
			},
			customerPassword: {
				required: true,
				rangelength: [6, 20],
				regex: /^(?![0-9]+$)(?![a-zA-Z]+$)[0-9A-Za-z]{6,20}$/      //密码正则表达式字母和数字的组合
			},
			confirmPassword: {
				required: true,
				equalTo: "#customerPassword"
			},
			companyEmail: {
				required: true ,
				email: true  //增加邮箱属性自动完成邮箱格式验证
			}
			
		},
		messages: {
			customerUsername: {
				required: "用户名不能为空",
				rangelength: "请输入{6}-{20}位字母、数字和下划线组成的用户名",
				remote: "该用户名已存在，请更换其他用户名"
			},
			customerPassword: {
				required: "密码不能为空",
				rangelength: "密码必须是{6}-{20}位",
				regex : "密码必须是数字和字母组合"
			},
			confirmPassword: {
				required: "确认密码不能为空",
				equalTo: "两次密码不一致"
			},
			companyEmail: {
				required: "请输入Email地址",  
			     email: "请输入正确的email地址"
			}
			
		}
	});
});