Function GetParentDomain

library/cpp/string_utils/url/url.cpp:319–327

}

TStringBuf GetParentDomain(const TStringBuf host Y_LIFETIME_BOUND, size_t level) noexcept {
    size_t pos = host.size();
    for (size_t i = 0; i < level; ++i) {
        pos = host.rfind('.', pos);
        if (pos == TString::npos)
            return host;
    }
    return host.SubStr(pos + 1);
}

TStringBuf GetZone(const TStringBuf host Y_LIFETIME_BOUND) noexcept {
    return GetParentDomain(host, 1);