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`regex.containsMatchIn()` for `.*@room.*` can take significantly longer than checking for `@room` (some real-world events I was getting took around 15 seconds with this, significantly slowing down the sync parsing). Checking `containsMatchIn()` does not lead to different results when having leading and trailing stars however, it will match in the same cases as when these are omitted. For testing purposes, I sent myself some Lorem Ipsum with 5000 words (not containing any @room). Without this change, the regex evaluation takes about 16 seconds. With this change, the regex evaluation now takes significantly less then a second.
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Big messages taking inappropriately long to evaluate .m.rule.roomnotif push rules
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