Serial data string.equals wild cards?

Projects Programming
11

As the saying goes

The first pattern that comes to mind is

CMD([0-9]{3})|LED|FOO|BAR

but the Arduino-listed Regexp library does not support | for alternates (nor {} for repetitions, although that is easily worked-around in this case).

It's simpler to just startsWith instead of equals and some logic

if (command.startsWith("CMD")) {
  command = command.substring(3);
  if (command.length()) {
    int num = command.toInt();
    if (num > 360) {
      Serial.println("max is 360");
    } else if (num < 0) {
      Serial.println("not negative");
    } else if (num > 0 || command.startsWith("0")) {
      Serial.println("do CMD: " + command);
    } else {
      Serial.println("invalid CMD: " + command);
    }
  } else {  // "".toInt() returns 0 as well   
    Serial.println("missing CMD number");
  }
} else if (command.equals("LED")) {
  Serial.println("OK, turn on LED");
} else {
  Serial.println("no match");
}

BTW, startsWith() is equivalent to indexOf() == 0. You don't want to match XCMD for example, where the index is 1.