<html> <head> <title>最简洁的IP判断正则表达式</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta http-equiv="Content-Language" content="zh-CN" /> <script type="text/javascript" src="http://files.cnblogs.com/Zjmainstay/jquery-1.6.2.min.js"></script> </head> <body> IP字段: <input type="text" id="ip" /> 判断结果:<input type="text" id="result" /> <script type="text/javascript"> $(document).ready(function(){
function validateIP(str){ return !!str.match(/^((25[0-5]|2[0-4]d|[01]?dd?)($|(?!.$).)){4}$/); } $("#ip").blur(function(){ var m = validateIP($(this).val()); m = m || 'null'; $("#result").val(m); }); }); </script> </body> </html>
结果:
IP字段: 判断结果: