Dustin Cote created KAFKA-4351:
----------------------------------

             Summary: Topic regex behavioral change with MirrorMaker new 
consumer
                 Key: KAFKA-4351
                 URL: https://issues.apache.org/jira/browse/KAFKA-4351
             Project: Kafka
          Issue Type: Bug
          Components: tools
    Affects Versions: 0.9.0.1
            Reporter: Dustin Cote
            Priority: Minor


There is a behavioral change when you use MirrorMaker with the new consumer 
versus the old consumer with respect to regex parsing of the input topic list.  
If one combines a regex with a comma separated list for the topic list with old 
consumer implementation of MirrorMaker, it works ok.  Example:
{code}
--whitelist '.+(my|mine),topic,anothertopic'
{code}
If you pass this in with the new consumer implementation, no topics are found.  
The workaround is to use something like:
{code}
--whitelist '.+(my|mine)|topic|anothertopic'
{code}

We should make an effort to be consistent between the two implementations as 
it's a bit surprising when migrating. I've verified the problem exists on 
0.9.0.1 but I don't see at first any fix to the problem in later versions.



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