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PHP regular expression code to determine whether the IP is legal

高洛峰
Release： 2016-11-29 16:06:06
Original
1712 people have browsed it

function matchip($q){ 
preg_match('/((25[0-5])|(2[0-4]d)|(1dd)|([1-9]d)|d)(.((25[0-5])|(2[0-4]d)|(1dd)|([1-9]d)|d)){3}/', $q, $matches); 
return $matches[0]; 
} 
$ipaddress = '201.103.2.2'; 
$iperror ='262.3.6.6'; 
$iptest = matchip( $ipaddress ); 
//当我们给matchip 的值为$ipaddress输出为201.103.2.2 
//当我们给matchip的函数值为$iperror时，输出值为 62.3.6.6 
 代码如下 复制代码 
if( $iptest ) 
{ 
 echo $iptest; 
} 
else 
{ 
 echo 'phpfensi.com提示：你输的的ip地址有问题'; 
}
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