isValidMACAddress static method
Check if string is a valid MAC address
mac - The MAC address to validate
Returns true if MAC address is valid
Implementation
static bool isValidMACAddress(String mac) {
final macRegex = RegExp(r'^([0-9A-Fa-f]{2}[:-]){5}([0-9A-Fa-f]{2})$');
return macRegex.hasMatch(mac);
}