How to extract data particular from large string in flutter?

March 11, 2023

I have a large string below the example of large string 👇

2023/03/11 11:14:30 N:21.234985 E:72.858528 4 km/h 275.15 -0.50 9 x:+0.000 y:+0.000 z:+0.000 2023/03/11 11:14:30 N:21.234987 E:72.858437 4 km/h 275.15 -8.90 9 x:+0.000 y:+0.000 z:+0.000 2023/03/11 11:14:32 N:21.234989 E:72.858452 0 km/h 270.92 -6.90 9 x:+0.000 y:+0.000 z:+0.000 2023/03/11 11:14:33 N:21.234995 E:72.858482 0 km/h 269.48 -3.60 9 x:+0.000 y:+0.000 z:+0.000 2023/03/11 11:14:34 N:21.234997 E:72.858505 0 km/h 275.53 -1.20 9 x:+0.000 y:+0.000 z:+0.000 2023/03/11 11:14:35 N:21.234999 E:72.858521 0 km/h 276.25 0.50 9 x:+0.000 y:+0.000 z:+0.000

I need to extract N and E from every line and i have two list like nList and eList and Every N element add into nList and every E element add into eList.

It’s possible in Flutter or Dart?

Thank you in advance for any help :}

Can you have any idea about it?

Here the attachment of .txt file for reference…
String File

>Solution :

You can iterate the list and retrieve values using a regular expression:

void main() {
  String input =
  "2023/03/11 11:14:30 N:21.234985 E:72.858528 4 km/h 275.15 -0.50  9 x:+0.000 y:+0.000 z:+0.000 2023/03/11 11:14:30 N:21.234987 E:72.858437 4 km/h 275.15 -8.90  9 x:+0.000 y:+0.000 z:+0.000 2023/03/11 11:14:32 N:21.234989 E:72.858452 0 km/h 270.92 -6.90  9 x:+0.000 y:+0.000 z:+0.000 2023/03/11 11:14:33 N:21.234995 E:72.858482 0 km/h 269.48 -3.60  9 x:+0.000 y:+0.000 z:+0.000 2023/03/11 11:14:34 N:21.234997 E:72.858505 0 km/h 275.53 -1.20  9 x:+0.000 y:+0.000 z:+0.000 2023/03/11 11:14:35 N:21.234999 E:72.858521 0 km/h 276.25 0.50  9 x:+0.000 y:+0.000 z:+0.000";
  List<String> lines = input.split("\n"); // split input string into individual lines
  List<String> nList = [];
  List<String> eList = [];
    for (final String line in lines) {
      RegExp nRegExp = RegExp(r'N:(\d+\.\d+)');
      RegExpMatch? nMatch = nRegExp.firstMatch(line);
      if (nMatch != null && nMatch.group(1) != null) {
        nList.add(nMatch.group(1)!);
      }
      RegExp eRegExp = RegExp(r'E:(\d+\.\d+)');
      RegExpMatch? eMatch = eRegExp.firstMatch(line);
      if (eMatch != null && eMatch.group(1) != null) {
        eList.add(eMatch.group(1)!);
      }
    }
    print(nList); // [21.234985]
    print(eList); // [72.858528]
  }