normalizeMiniProgramPhoneNumber function

String normalizeMiniProgramPhoneNumber(String value)

Normalizes an ordinary phone number for a user-controlled system dialer. Rejects schemes, extensions, pauses, USSD/MMI codes and control characters.

Implementation

String normalizeMiniProgramPhoneNumber(String value) {
  if (value.length > 64 ||
      RegExp(r'[\x00-\x1f\x7f]').hasMatch(value) ||
      !RegExp(r'^[+0-9(). -]+$').hasMatch(value)) {
    throw const FormatException('Provide an ordinary phone number.');
  }
  final number = value.trim();
  if (number.isEmpty ||
      number.length > 64 ||
      !RegExp(r'^[+0-9(). -]+$').hasMatch(number)) {
    throw const FormatException('Provide an ordinary phone number.');
  }
  final normalized = number.replaceAll(RegExp(r'[(). -]'), '');
  if (!RegExp(r'^\+?[0-9]{1,32}$').hasMatch(normalized)) {
    throw const FormatException('Phone numbers require 1-32 digits.');
  }
  return normalized;
}