s((\d+)([kmg]b?)){
        $1 * ({
            k  => 1000,
            kb => 1024,
            m  => 1000*1000,
            mb => 1024*1024,
            g  => 1000*1000*1000,
            gb => 1024*1024*1024,
        })->{lc $2}
    }ie;