regex contains year or pdf for hackertimes

dartpad001.dart

void main() {
  List list1 = [1, 2, 3, 4, 5, 6, 7];
  List list2 = [11, 12, 13];
  int index = 6;
  list2.forEach((item) {
    list1.insert(index, item);
    index++;
  });
  print(list1);
  var titleYear = 'Hello there, how are you (2005)';
  var titleYearPdf = 'Opportunities and Challenges of Emerging Technologies for Refugees (2019) [pdf]';
  print(doesItContainYear2(titleYear));
  print(doesItContainYear2(titleYearPdf));
  var titlePdf = 'Surveillance on UK council websites [pdf]';
  print(doesItContainPdf(titlePdf));

  String x = storeKeyAsPerIDandTime(
      'kapil001', DateTime.now().subtract(Duration(minutes: 7)));
  print(x);

  print(isViewedTimeFromKeyAbove5Min(x));
}

doesItContainYear(String title) {
  if (title.contains('(') && title.contains(')')) {
    var divide = title.split('(').toList();
//   print(divide);
    var length = divide[1].length;
    if (divide[1][length - 1] == ')' && length == 5) {
//     print('its a year');
      return true;
    }
  }
  return false;
}
doesItContainYear2(String title) {
  return title.contains(new RegExp(r'[0-9.\-\)\(]+'));
  
//   var l=title.length;
//   if (title.contains('(') && title.contains(')') && title.contains(new RegExp(r'[0-9]'), l-7)) {
//     return true;
//   }
//   return false;
}

doesItContainPdf(String title) {
  var l = title.length;
  if (title.contains('[') && title.contains(']')) {
    var divide = title.split('[').toList();
//   print(divide);
    var length = divide[1].length;
    if (divide[1][length - 1] == ']' &&
        length == 4 &&
        title.substring(l - 4, l - 1) == 'pdf') {
//     print('its a year');
      return true;
    }
  }
  return false;
}

storeKeyAsPerIDandTime(String newsId, DateTime timeNow) {
  return newsId + '/' + timeNow.toString();
}

isViewedTimeFromKeyAbove5Min(String mapKey) {
  var timeString = mapKey.split('/').toList()[1];
  print(timeString);
  DateTime time = DateTime.parse(timeString);
  return DateTime.now().difference(time).inMinutes >= 5;
}