class Ideone {
    public static void main(String[] args) {
        final int valueForJ = 37;
        System.out.println(replaceJWith("5+2+5+2 --j *2*7+3", valueForJ));
        System.out.println(replaceJWith("5+2+5+2 j-- *2*7+3", valueForJ));
        System.out.println(replaceJWith("5+2+5+2 ++j *2*7+3", valueForJ));
        System.out.println(replaceJWith("5+2+5+2 j++ *2*7+3", valueForJ));
    }
 
    public static String replaceJWith(String s, int valueForJ) {
        s = s.replaceAll("[-]{2}j|j[-]{2}", Integer.toString(valueForJ - 1));
        return s.replaceAll("[+]{2}j|j[+]{2}", Integer.toString(valueForJ + 1));
    }
}

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