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https://issues.apache.org/jira/browse/KAFKA-8246?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16819743#comment-16819743
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Boyang Chen commented on KAFKA-8246:
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`boolean validChar = (c >= 'a' && c <= 'z') || (c >= '0' && c <= '9') || (c >=
'A' && c <= 'Z') || c == '.' || ...`
we should consider a regex approach for Topic and group.instance.id charset
constraints
> 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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