xpressive_csv.cpp

void xpressive_csv(std::string raw_csv, std::set<std::string>& dest_set)
{
    using namespace boost::xpressive;
    sregex re = +(+alnum);
    std::transform(
        sregex_iterator(raw_csv.begin(), raw_csv.end(), re),
        sregex_iterator(),
        std::inserter(dest_set, dest_set.begin()),
        [](smatch const& match)
        {
            return match[0];
        }
    );
}