| 用正则表达式验证ip地址和身份证代码实例如下：
<script language="javascript">
function checkIP()
{
obj=document.getElementById("ip").value
//ip地址
//var exp=/^(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])$/;
//身份证
//var exp=/\b(((?!\d\d\d)\d+|1\d\d|2[0-4]\d|25[0-5])(\b|\.)){4}/
//var exp=/^(\d{15}|\d{17}[x0-9])/
var exp=/^([\d]{15}|[\d]{18}|[\d]{17}[x|X])$/
var reg = obj.match(exp);
if(reg==null)
{
alert("IP地址不合法！");
}
else
{
alert("IP地址合法！");
}
}
</script>
请输入IP地址：<input type="text" id="ip">
<input type="button" onclick="checkIP()" value="验证">
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