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.
All good things come to an end - thanks to all our customers and partners who have been along the Hipchat and Stride journey with us. As of Feb 15th 2019, Hipchat Cloud and Stride have reached ...
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