密碼的校驗.大小寫字母,數字,特殊字符中的至少3種

大小寫字母,數字,特殊字符中的至少3種.8位以上,正確返回true
    public static boolean rexCheckPassword(String input) {
        // 8-20 位，字母、數字、字符
        String regStr = "^(?![a-zA-Z]+$)(?![A-Z0-9]+$)(?![A-Z\\W_]+$)(?![a-z0-9]+$)(?![a-z\\W_]+$)(?![0-9\\W_]+$)[a-zA-Z0-9\\W_]{8,20}$";
        return input.matches(regStr);
    }

    @Test
    public static void main(String[] args){
        System.out.println(rexCheckPassword("abcd"));
        System.out.println(rexCheckPassword("abcd1234"));
        System.out.println(rexCheckPassword("abcd1234#"));
        System.out.println(rexCheckPassword("Abcd1234"));
        System.out.println(rexCheckPassword("Abcd#$%"));
}}