internationalFormatPhoneNumber static method

Implementation

static String internationalFormatPhoneNumber(String phoneNumber) {
  // Remove any non-digit characters from the phone number
  var digitsOnly = phoneNumber.replaceAll(RegExp(r'\D'), '');

  // Extract the country code from the digitsOnly
  String countryCode = '+${digitsOnly.substring(0, 2)}';
  digitsOnly =
      digitsOnly.substring(2); // Remove country code from the number.

  // Add the remaining digits with proper formatting.
  final formattedNumber = StringBuffer();
  formattedNumber.write('($countryCode) ');

  int i = 0;
  while (i < digitsOnly.length) {
    int groupLength =
        2; // Default group length for international phone numbers.
    if (i == 0 && countryCode == '+1') {
      groupLength = 3; // Special case for US: first group of 3 digits.
    }

    int end = i + groupLength;
    formattedNumber.write(digitsOnly.substring(i, end)); // Add the group.

    if (end < digitsOnly.length) {
      formattedNumber.write(' '); // Add space between groups.
    }
    i = end; // Move to the next group.
  }

  return formattedNumber.toString(); // Return the formatted phone number.
}