255.255 (IPv4-mapped IPv6 addresses and IPv4-translated addresses)
  |(?:(?:[0-9a-f]{1,4}:){1,4}:{{ipv4}})                 # 2001:db8:3:4::192.0.2.33  64:ff9b::192.0.2.33                       (IPv4-Embedded IPv6 Address)
  |(?:fe80:(?::[0-9a-f]{1,4}){0,4}%[0-9a-z]{1,})        # fe80::7:8%eth0     fe80::7:8%1                                      (link-local IPv6 addresses with zone index)
  |(?:(?:[0-9a-f]{1,4}:){7,7}    [0-9a-f]{1,4})         # 1:2:3:4:5:6:7:8
  |   (?:[0-9a-f]{1,4}:      (?::[0-9a-f]{1,4}){1,6})   # 1::3:4:5:6:7:8     1::3:4:5:6:7:8   1::8
  |(?:(?:[0-9a-f]{1,4}:){1,2}(?::[0-9a-f]{1,4}){1,5})   # 1::4:5:6:7:8       1:2::4:5:6:7:8   1:2::8
  |(?:(?:[0-9a-f]{1,4}:){1,3}(?::[0-9a-f]{1,4}){1,4})   # 1::5:6:7:8         1:2:3::5:6:7:8   1:2:3::8
  |(?:(?:[0-9a-f]{1,4}:){1,4}(?::[0-9a-f]{1,4}){1,3})   # 1::6:7:8           1:2:3:4::6:7:8   1:2:3:4::8
  |(?:(?:[0-9a-f]{1,4}:){1,5}(?::[0-9a-f]{1,4}){1,2})   # 1::7:8             1:2:3:4:5::7:8   1:2:3:4:5::8
  |(?:(?:[0-9a-f]{1,4}:){1,6}   :[0-9a-f]{1,4})         # 1::8               1:2:3:4:5:6::8   1:2:3:4:5:6::8
  |(?:(?:[0-9a-f]{1,4}:){1,7}   :)                      # 1::                                 1:2:3:4:5:6:7::
  |(?::(?:(?::[0-9a-f]{1,4}){1,7}|:))                   # ::2:3:4:5:6:7:8    ::2:3:4:5:6:7:8  ::8       ::
)(?![0-9A-Za-z:])