正则表达式只从文本中提取IPv4地址 [英] Regex to extract only IPv4 addresses from text

问题描述

我尝试从给定的示例输入中仅提取IP地址，但它会用它提取一些文本。这是我的代码：

I've tried to extract only IP addresses from the the given example input, but it extracts some text with it. Here's my code:

$spfreccord="v=spf1 include:amazonses.com include:nl2go.com include:smtproutes.com include:smtpout.com ip4:46.163.100.196 ip4:46.163.100.194 ip4:85.13.135.76 ~all";

 $regexIpAddress = '/ip[4|6]:([\.\/0-9a-z\:]*)/';        
 preg_match($regexIpAddress, $spfreccord, $ip_match);
 var_dump($ip_match);

我希望只匹配IPv4 IP地址 xxx.xxx。表中每列的xxx.xxx ，但看起来 $ regexIpAddress 不正确。

I'm looking to match only the IPv4 IP address xxx.xxx.xxx.xxx in each column of the table, but it looks like that the $regexIpAddress is not correct.

你能帮我找到正确的正则表达式来提取IPv4 IP地址吗？谢谢。

Can you please help me find the correct regex to extract only the IPv4 IP addresses? Thanks.

推荐答案

使用以下正则表达式：

/\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}(?:\/\d{2})?/

所以对此：

$spfreccord="v=spf1 include:amazonses.com include:nl2go.com include:smtproutes.com include:smtpout.com ip4:46.163.100.196 ip4:46.163.100.194 ip4:85.13.135.76 cidr class v=spf1 ip4:205.201.128.0/20 ip4:198.2.128.0/18 ~all";

 $regexIpAddress = '/\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}(?:\/\d{2})?/';        
 preg_match_all($regexIpAddress, $spfreccord, $ip_match);
 var_dump($ip_match);

给予：

array(1) {
  [0]=>
  array(5) {
    [0]=>
    string(14) "46.163.100.196"
    [1]=>
    string(14) "46.163.100.194"
    [2]=>
    string(12) "85.13.135.76"
    [3]=>
    string(16) "205.201.128.0/20"
    [4]=>
    string(14) "198.2.128.0/18"
  }
}

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