containsArabic function
Implementation
bool containsArabic(String input) {
String arabicLetters = 'دجحخهعغفقثصضشسيبلاتنمكطظزوةىلارؤءئذلآلآلإإ';
String nArabic = normalise(arabicLetters);
String nInput = normalise(input);
return nArabic.contains(nInput);
}