uptop commented on issue #265: 为什么topic和group 名字要限制只能包含这些字符 VALID_PATTERN_STR = "^[%|a-zA-Z0-9_-]+$" URL: https://github.com/apache/rocketmq/issues/265#issuecomment-377435307 方便简单解释下为什么RocketMQ会做这个限制吗？比如构建索引或者存储时候有什么特殊的情况需要考虑，才做了这个限制吗。 @vongosling
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