Function IsValidIPv6

library/cpp/netliba/v12/udp_address.cpp:16–22

namespace NNetliba_v12 {
    bool IsValidIPv6(const char* str) {
        const char* cur = str;
        while (*cur && *cur != '%')
            ++cur;
        TString tmp(str, cur);
        return TryParseIp6FromString(tmp.c_str()).Defined();
    }

    static bool ParseInetName(TUdpAddress* pRes, const char* name, int nDefaultPort, EUdpAddressType addressType) {
        int nPort = nDefaultPort;