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Found out what was wrong: I fed boost::regex_search() the pointer to a substring that was created in-place. match[2] was a pointer to a substring inside that. The problem was, that match was declared outside of the if-block. So after the if-block match[2] would point to a now freed memory address. It didn't have any effects because I didn't use match afterwards. I rewrote the whole thing with iterators. Slightly less readable, slightly better performance (probably).