常用正则验证

 var ip = $(this).val();                                var ip = ip.match(/(\d+)\.(\d+)\.(\d+)\.(\d+)/g);//正则判断是否为IP;

var email = $(this).val();//邮箱                                var reg = /^([a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+((\.[a-zA-Z0-9_-]{2,3}){1,2})$/;//验证邮箱的正则                                var i = reg.test(email)