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<?php $strings = [ "999TB2", "9999XX" ]; $re = '/^(?|(\d{3})([A-Z]{2})(\d)|(\d{2})(\d{2})([A-Z]{2}))$/'; foreach ($strings as $str) { echo preg_replace($re, '$1-$2-$3', $str) . PHP_EOL; }
Output for git.master, git.master_jit, rfc.property-hooks
999-TB-2 99-99-XX

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