// Define a function.
void printInteger(int aNumber) {
  print('The number is $aNumber.'); // Print to console.
}

// This is where the app starts executing.
void main() {
  String dataMatrix = "00000046208262nZ2qnLHODVFWktT";
  String numberText = dataMatrix.replaceAll(RegExp("[a-zA-Z]"), '');
  print(int.parse(numberText));
}