((2[0-4]\d|25[0-5]|[01]?\d\d?)\.){
3}(2[0-4]\d|25[0-5]|[01]?\d\d?)
Regular match ip address
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Origin blog.csdn.net/weixin_43202081/article/details/109776162
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((2[0-4]\d|25[0-5]|[01]?\d\d?)\.){
3}(2[0-4]\d|25[0-5]|[01]?\d\d?)