ipv6_fields
Match full and compressed IPv6 addresses as defined in RFC 2373
VALID
FEDC:BA98:7654:3210:FEDC:BA98:7654:3210
1080::8:800:200C:417A
::FFFF:129.144.52.38
INVALID
FEDC::7654:3210::BA98:7654:3210
FEDC:BA98:7654:3210
::