simple function to normalize mac addresses

mac_address.dart

final d = "([0-9A-F]{2})";
final s = "[:\.-]?";

final RegExp re = RegExp(
  "$d$s$d$s$d$s$d$s$d$s$d",
  multiLine: false,
);

/// MAC addresses will come in the following shape or form:
/// 00-11-22-33-44-55
/// 00:11:22:33:44:55
/// 00.11.22.33.44.55
/// 001122334455
/// 0011.2233.4455
String normalizeMacAddress(String macaddress) {
  final matches = re.allMatches(macaddress);
  
  if (matches.length < 1) {
    return null;
  }
  
  final match = matches.first;
  return "${match.group(1)}:${match.group(2)}:${match.group(3)}:${match.group(4)}:${match.group(5)}:${match.group(6)}";
}

void test(address) {
  final result = normalizeMacAddress(address);
  print("$address => $result");
}

void main() {
  test("00-11-22-33-44-55");
  test("00:11:22:33:44:55");
  test("00.11.22.33.44.55");
  test("001122334455");
  test("0011.2233.4455");
}