[boost][regex] Bug in regex 1.32 ?

Hello, I think there is a bug in Boost.Regex 1.32.0 with regex_constants::icase. std::string s("xx"); boost::regex re("x", boost::regex_constants::icase); boost::regex_replace(s, re, "a"); The replace yields "axa"; should be "aa" I think. Without the icase flag the replace yields "aa". Thank you Jan