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.
...have mention name FirstnameLastname. Fe.: @MaartenCautreels This certainly helps to know who is being mentioned in a conversation. Imagine your colleague sends the following message...
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