public static String parseGroup(String retryTopic) {
        if (isPopRetryTopicV2(retryTopic)) {
            String[] result = retryTopic.split(POP_RETRY_REGEX_SEPARATOR_V2);
            if (result.length == 2) {
                return result[0].substring(MixAll.RETRY_GROUP_TOPIC_PREFIX.length());
            }
        }
        return retryTopic.substring(MixAll.RETRY_GROUP_TOPIC_PREFIX.length());
    }
@Test
    public void testParseGroup() {
        String popRetryTopic = KeyBuilder.buildPopRetryTopicV2(topic, group);
        assertThat(KeyBuilder.parseGroup(popRetryTopic)).isEqualTo(group);
    }