isValidIPv6Address static method
Check if string is a valid IPv6 address
ip - The IP address to validate
Returns true if IPv6 address is valid
Implementation
static bool isValidIPv6Address(String ip) {
// Simplified IPv6 validation
final ipv6Regex = RegExp(r'^([0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}$');
return ipv6Regex.hasMatch(ip);
}