Java - 正则表达式（使用?:）匹配密码

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            String password = "Zz345678901234567890";
            // (?=.*x) 非捕获，只是检测整个passwrod 是否含有x
            String pattern = "^(?=.*\\d)(?=.*[a-z])(?=.*[A-Z])(\\S){8,20}$";
            System.out.println(Pattern.matches(pattern, password));