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کد:
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);


  String code = "IPD,0,10:arduino.ir+" ;
  int firstClosingBracket = code.indexOf(':');
   Serial.println("The First index of ; in the string " + code + " is " + firstClosingBracket);


  int secondOpeningBracket = firstClosingBracket + 1;
  int secondClosingBracket = code.indexOf('+', secondOpeningBracket);
   Serial.println("The Second  index of  the second ; in the string " + code + " is " + secondClosingBracket);


  String number = code.substring(9, 19);
  Serial.println(number);


}


void loop() {
  // put your main code here, to run repeatedly:


}