> Text representation of IPv4 is easy to detect. IPv6 representation? Good luck with that. This regex will detect any IPv6 address: ([0-9A-Fa-f]*:){2}[0-9

> Text representation of IPv4 is easy to detect. IPv6 representation? Good luck with that. This regex will detect any IPv6 address: ([0-9A-Fa-f]*:){2}[0-9A-Fa-f:.]* Then you can feed matches to a real address parser to filter out false positives.