Hi Team, In TopicCommand class, the description for "--topic" parameter is "The topic to be create, alter or describe. Can also accept a regular expression except for --create option".
It means the value of topic parameter will be treated as regex expression in the logic, so multiple topics may be operated at the same time when invoking "delete", "alter", "describe" and "list" methods. For example, we have two topics on Kafka: "test.a" and "test.a", if I run describe command "--delete --topic test.a", it will delete both of those topics. Why don't we treat the value user passed as a simple string instead of regex expression? I would like to know your concern. Actually I submitted one PR already: https://github.com/apache/kafka/pull/3533, but I closed it after I see the description of "topic" parameter. Thanks! -- Shuai Zhang
