正则表达式，将字符串分割两部分

    @Test
    public void split() {
        String file_id = "group1/M01/00/00/wKjljWXLZxWAeK7JAAmOXAH6cKY805.png";
        String[] splitStr = file_id.split("/");
        String group_name = splitStr[0];
        String remoteFileName = "";
        for (int i = 1; i < splitStr.length; i++) {
            remoteFileName += splitStr[i];
            if (i != splitStr.length - 1) {
                remoteFileName += "/";
            }
        }
        System.out.println("group_name = " + group_name);
        System.out.println("remoteFileName = " + remoteFileName);
    }

group_name = group1
remoteFileName = M01/00/00/wKjljWXLZxWAeK7JAAmOXAH6cKY805.png