正则表达式确定是否使用IPv6或IPv4以及是否提供了端口 [英] Regex to determine, if IPv6 or IPv4 and if port is given

问题描述

我正在搜索一个正则表达式，可以确定给定的 IP地址是 IPv4 还是 IPv6 和(对于我)是否连接了端口号.

I'm searching for a regular expression that can determine, if the given IP address is IPv4 or IPv6 and (most important for me) if a port number is attached, or not.

我尝试了一些正则表达式，但没有一个能按预期工作.

I tried a few regular expressions, but none of them worked as expected.

推荐答案

如果我可以假定输入将是一个简单的有效IP地址，而您只是想知道您是否具有端口，则可以执行以下操作:

If I can assume that the input will be a simple valid IP address and you simply want to know whether you have a port or not, you could do the following:

if (preg_match("/^(?:[0-9.]+|(?:\[[0-9a-fA-F:]+\]))(:[0-9]+)$/", $ip)) 
{
    echo "A port was found.";
} 
else 
{
    echo "A port was not found.";
}

这将与

• [2001:0db8:85a3:08d3:1319:8a2e:0370:7344]:8080 或
• 127.0.0.1:8080

但不匹配

• 2001:0db8:85a3:08d3:1319:8a2e:0370:7344 或
• 127.0.0.1

请记住，该标准将定义为通过将IP文字括在方括号中来区分.

Keep in mind that the standard defines an IPv6 host to be distinguished by enclosing the IP literal within square brackets.

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