/((?:[a-zA-Z\p{Cyrillic}0-9]+))(#)(\\d+)/is That's what I recently tried but still doesn't work. I have no idea what else to try.
Just add the u modifier (for unicode) at the end of the regex:
/((?:[a-zA-Z\p{Cyrillic}0-9]+))(#)(\\d+)/isu
// here ___^
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