isChineseIDCard static method

Implementation

static bool isChineseIDCard(String? idCard) {
  if (idCard?.isEmpty ?? true) return false;

  // 18位身份证正则
  final regex = RegExp(r'^\d{17}[\dXx]$');
  if (!regex.hasMatch(idCard!)) return false;

  // 校验码验证
  const weights = [7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2];
  const checkCodes = ['1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2'];

  int sum = 0;
  for (int i = 0; i < 17; i++) {
    sum += int.parse(idCard[i]) * weights[i];
  }

  final expectedCheckCode = checkCodes[sum % 11];
  return idCard[17].toUpperCase() == expectedCheckCode;
}