如何使用php [duplicate]提取所有IP地址

Question

This question already has an answer here:

• Regular expression to match DNS hostname or IP Address? 21 answers

how to extract all ip address from a given string, please.

eg:

"
2014-07-08 19:05:20 1X4YpU-0001kr-6y <= [e-mail] H=(server.takcloud.com) [185.4.28.203] P=esmtps X=TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256 S=1018 id=[e-mail]
"

</div>

Answer 1

I would use RegEx

Search for groups of up to three "{1,3}" digits "\d" separated by a "."

\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b

To use it in PHP

$mailStr = "2014-07-08 19:05:20 1X4YpU-0001kr-6y <= [e-mail] H=(server.takcloud.com) [185.4.28.203] P=esmtps X=TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256 S=1018 id=[e-mail]";
$regexpattern = "/\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b/";
preg_match_all($regexpattern , $mailStr, $matches);
print_r($matches);