Get text String in Between two Strings (keywords) - in Dart - Flutter

Question

I'm currently using this function bellow to capture text after a certain keyword in a String of text :

      static String? _getTextAfterKeyword({
    required String inputtext,
    required String keyword,
  }) {
    final indexKeyword = text.indexOf(keyword);
    final indexAfter = indexKeyword + keyword.length;

    if (indexKeyword == -1) {
      return null;
    } else {
      return text.substring(indexAfter).trim();
    }
  }

Now I'm trying to capture a String of text in between two keywords - but what I've tried hasn't worked - 🙏

To illustrate this is what I need :

inputtext = "Lorem ipsum Lorem ipsum Lorem ipsum FIRSTKEYWORD - text I would like to return - SECONDKEYWORD Lorem ipsum Lorem ipsum Lorem ipsum"

the function would look something like this :

 static String? _getTextInBetweenTwoKeywords({
    required String inputtext,
    required String firstKeyword,
    required String SecondKeyword,
  }) {

   //Some Code

      return the StringInBetweentheTwoKeywords;
    
  }
``

Please give more detail on what you want to talk about, so that the viewers may understand better. — Mike Osborn
– Mike Osborn, Commented Oct 13, 2021 at 9:29

h8moss · Accepted Answer · 2021-10-13 11:59:43Z

2

Would something like this do the trick?

String capture(String first, String second, String input) {
  int firstIndex = input.indexOf(first) + first.length;
  int secondIndex = input.indexOf(second);
  return input.substring(firstIndex, secondIndex);
}

void main() {
  print(capture('FIRST', 'SECOND', 'AAAAAAA FIRST-what should print-SECOND BBBBBB')); // prints '-what should print-';
}

answered Oct 13, 2021 at 11:59

h8moss

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1 Comment

Sunshine Over a year ago

thank you this works! I'll try to add some code so it doesn't crash when no matching keywords are found - thank you ⚡️

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