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过年前托朋友入手港版NS，于是过年到现在沉迷塞尔达无法自拔。。。年后又入了DLC季票，大师模式又新开档，目前过了4神兽，就剩加农没打了。。。每天刷刷人马，刷刷Amiibo，捡捡流星也是乐在其中！这篇文章没什么主题，就是想吹吹塞尔达有多好玩！

NS 双红

阅读剩余部分

+noall表示隐藏所有内容 +answer 表示显示响应内容

+[no]question,+[no]answer,+[no]authority,+[no]stat,+short

# 直接查询根DNS
dig

# 指定解析服务器为8.8.8.8
dig @8.8.8.8 phpgao.com

# 查询DNS记录
dig -t NS phpgao.com +noall +answer


# 查询MX记录
dig -t MX phpgao.com +noall +answer

正则的效率是在比不上原生的，所以丢个链接(过滤器函数)走人。

二逼正则:

$valid = preg_match('/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\z/', $string);

正确正则:

preg_match('/^(?:25[0-5]|2[0-4]\d|1\d\d|[1-9]\d|\d)(?:[.](?:25[0-5]|2[0-4]\d|1\d\d|[1-9]\d|\d)){3}$/', $ipAddress);

过滤器的选项，比如可以过滤私有IP地址等。

用法参考Validating an IP address with PHP's filter_var function

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