php - Find Domain Names From A String

Question

The following code can find www.google.com.I want to find google.com too ie domain name after space.

$s = 'is www.google.com equal to google.com ';
preg_match_all ("/(www)(.*)(.com|.info|.pk)/U", $s , $ma);
print_r($ma);

Answer 1

(www\.)?[^ ]+?(\.com|\.info|\.pk)

从技术上讲，使用该测试字符串可以满足您的需求。目的是什么，还有更多的测试用例吗？