密码的校验.大小写字母,数字,特殊字符中的至少3种

大小写字母,数字,特殊字符中的至少3种.8位以上,正确返回true    public static boolean rexCheckPassword(String input) {        // 8-20 位，字母、数字、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}$";        return input.matches(regStr);    }    @Test    public static void main(String[] args){        System.out.println(rexCheckPassword("abcd"));        System.out.println(rexCheckPassword("abcd1234"));        System.out.println(rexCheckPassword("abcd1234#"));        System.out.println(rexCheckPassword("Abcd1234"));        System.out.println(rexCheckPassword("Abcd#$%"));}}

来源：https://www.cnblogs.com/cqbstyx/p/11063278.html