HipChat search doesn't currently support regex-style searching. There are some shortcuts you can use to improve the accuracy of your search, such as using "@mention" which will filter messages to those sent by that particular user (in addition to messages with that specific mention).
We hope to add improved search options over time, but it's not clear whether that would include regex-based searches.
...from the beginning. We have built up a lot of content in HipChat, with it being a core tool in our distributed company model. While it is true that we didn’t need to move to Slack immediately, we felt it...
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