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<?php $main_url_host = 'main.example.com'; $current_url_host = 'sub.main.example.com'; preg_match('~(.+)*\.' . $main_url_host. '~', $current_url_host, $matches ); var_dump($matches[1]);
Output for git.master, git.master_jit, rfc.property-hooks
string(3) "sub"

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