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https://issues.apache.org/jira/browse/KAFKA-8246?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16819899#comment-16819899
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Sönke Liebau commented on KAFKA-8246:
-------------------------------------

I believe that used to be a regular expression but was changed for better 
performance, see this [pull request|https://github.com/apache/kafka/pull/3234].

> refactor topic/group instance id validation condition
> -----------------------------------------------------
>
>                 Key: KAFKA-8246
>                 URL: https://issues.apache.org/jira/browse/KAFKA-8246
>             Project: Kafka
>          Issue Type: Improvement
>            Reporter: Boyang Chen
>            Assignee: Boyang Chen
>            Priority: Major
>




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