如何用正则表达式，判断文本框中输入的是IP地址

怎么用正则表达式，判断文本框中输入的是IP地址
标准的IP地址是192.168.0.1,

能不能通过正则表达式判断，文本框中有4个"."，而且"."中都是不大于256的数字？

2[0-4][0-9]25[0-5])\\.((?!\\d\\d\\d)\\d+1\d{0,2}[01]?[0-9][0-9]?)$/)){
alert("success");
}else{
alert("error");
}

1\\d\\d2[0-4]\\d2[0-4][0-9]

Pattern.compile("\\b((?!\\d\\d\\d)\\d+\d{1,2})/;
ip = textvalue;
if (!ipRegEXP.exec(ip)){
				alert("ip格式不对!");
}1\\d\\d1\\d\\d2[0-4]\\d25[0-5])\\.((?!\\d\\d\\d)\\d+2[0-4]\\d1\d{0,2}1\\d\\d25[0-5])\\.((?!\\d\\d\\d)\\d+25[0-5])\\b");

1\d{0,2}[1-9]\d?)\.(?:(?:25[0-5]2[0-4]\d2[0-4]\dvar ipRegEXP = /^(25[0-5]\d{1,2})\.){2}(25[0-5]2[0-4]\\d

var ip ="192.168.1.111";
if(ip.match(/^(?:(?:25[0-5]2[0-4]\d[01]?[0-9][0-9]?)\.){3}(?:25[0-5]