Java正则表达式提取关键内容

input = "jdbc:hive2://176.16.2.125:10000/ods_hive_test"；

如果通过正则表达式，提取出176.16.2.125:?

public static void main(String[] args) {
        String aimStr = "jdbc:hive2://176.16.2.125:10000/ods_hive_test";
        Pattern pattern = Pattern.compile("(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)");
        Matcher m = pattern.matcher(aimStr);
        if(m.find()) {
            System.out.println(m.group());
        }
    }
    //如果要判断带冒号的话：
    //pattern里的正则最后加上个冒号就好了
    Pattern pattern = Pattern.compile("(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?):");


public static void main(String[] args) {
        String IPADDRESS_PATTERN = "(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)";
        Pattern pattern = Pattern.compile(IPADDRESS_PATTERN);
        Matcher matcher = pattern.matcher("jdbc:hive2://176.16.2.125:10000/ods_hive_test");
        while (matcher.find()) {
            System.out.println(matcher.group());
        }
    }