public static void main(String[] args) {

        String test = "PJ2639: PJ2639 - AIEEE191";
        String[] out = test.split("-");

        String target = out[1].trim();

        System.out.println("target : " +target);

        String[] out2 = target.split("(?<=\\D)(?=\\d)");

        String target_prefix = out2[0];
        String target_id = out2[1];

        System.out.println("target_prefix : " +target_prefix);
        System.out.println("target_id : " +target_id);
        Integer id = Integer.parseInt(target_id);

        System.out.println("target_id_num : " +id);
    }