How to find the Indices of All Occurrences of Substring in Dart - Step by Step Examples

How to find the Indices of All Occurrences of Substring in Dart ?

Answer

To find the indices of all occurrences of a substring in Dart, you can use the allMatches method of the RegExp class in a loop to find all occurrences and store their indices.

✐ Examples

1 Find Indices of All Occurrences in String

In this example,

We create a string variable str with a string value.
We create a regular expression pattern to match the substring.
We use the allMatches method of the RegExp class to find all occurrences of the pattern within str and store their indices.
We print the indices of all occurrences.

Dart Program

void main() {
  String str = 'Hello Hello Hello';
  RegExp regex = RegExp('Hello');
  Iterable<RegExpMatch> matches = regex.allMatches(str);
  List<int> indices = [];
  for (RegExpMatch match in matches) {
    indices.add(match.start);
  }
  print('Indices of all occurrences: $indices');
}

Output

Indices of all occurrences: [0, 6, 12]

2 Find Indices of All Occurrences in Another String

In this example,

We create two string variables str1 and str2 with different values.
We create a regular expression pattern to match str2.
We use the allMatches method of the RegExp class to find all occurrences of the pattern within str1 and store their indices.
We print the indices of all occurrences.

Dart Program

void main() {
  String str1 = 'apple banana cherry banana';
  String str2 = 'banana';
  RegExp regex = RegExp(str2);
  Iterable<RegExpMatch> matches = regex.allMatches(str1);
  List<int> indices = [];
  for (RegExpMatch match in matches) {
    indices.add(match.start);
  }
  print('Indices of all occurrences: $indices');
}

Output

Indices of all occurrences: [6, 20]

Summary

In this tutorial, we learned How to find the Indices of All Occurrences of Substring in Dart language with well detailed examples.

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How to find the Indices of All Occurrences of Substring in Dart - Step by Step Examples

How to find the Indices of All Occurrences of Substring in Dart ?

Answer

✐ Examples

1 Find Indices of All Occurrences in String

Dart Program

Output

2 Find Indices of All Occurrences in Another String

Dart Program

Output

Summary

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