dajac commented on PR #17634:
URL: https://github.com/apache/kafka/pull/17634#issuecomment-2447212630

   > Out of curiosity, if I recall correctly, Google's RE2 is not fully 
compatible with Java regex. Could this cause issues if the `Consumer` accepts 
Java `Pattern`, allowing users to use unsupported regex features?
   
   That's right. `Pattern` will keep working on the client side via the 
existing `subscribe(Pattern)` api. We will deprecate it at some point. The 
server side one will be used via `subscribe(SubscriptionPattern)`. 
`SubscriptionPattern` is defined 
[here](https://cwiki.apache.org/confluence/display/KAFKA/KIP-848%3A+The+Next+Generation+of+the+Consumer+Rebalance+Protocol#KIP848:TheNextGenerationoftheConsumerRebalanceProtocol-NewSubscriptionPatternclass).
 This avoids the compatibility issue but users will have to migrate from the 
old one to the new one.


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