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<?php $main_url_host = 'main.example.com'; $current_url_host = 'sub.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
Warning: Undefined array key 1 in /in/UBXHC on line 7 NULL

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