Leetcode 468. Validate IP Address--判断是IPV4还是IPV6

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于 2019-06-21 11:34:53 发布

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分类专栏： Java SSM 笔试面经 LeetCode 剑指Offer 后端/大数据文章标签： Leetcode 468. Validate IP Address

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编写一个函数来检查输入的字符串是否为有效的IPv4地址、IPv6地址或两者都不是。IPv4地址以点分十进制表示，IPv6地址由八组四字符十六进制数组成，用冒号分隔。注意IPv4中不允许前导零，IPv6中也不允许额外的前导零，并且不能使用'::'来表示连续的零组。

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Write a function to check whether an input string is a valid IPv4 address or IPv6 address or neither.

IPv4 addresses are canonically represented in dot-decimal notation, which consists of four decimal numbers, each ranging from 0 to 255, separated by dots ("."), e.g.,172.16.254.1;

Besides, leading zeros in the IPv4 is invalid. For example, the address 172.16.254.01 is invalid.

IPv6 addresses are represented as eight groups of four hexadecimal digits, each group representing 16 bits. The groups are separated by colons (":"). For example, the address 2001:0db8:85a3:0000:0000:8a2e:0370:7334 is a valid one. Also, we could omit some leading zeros among four hexadecimal digits and