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<?php $main_url_host = 'main.example.com'; $current_url_host = 'subdomain.main.example.com'; preg_match('~(.+)*\.' . $main_url_host. '$~', $current_url_host, $matches ); var_dump( $matches );
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { [0]=> string(26) "subdomain.main.example.com" [1]=> string(9) "subdomain" }

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