How to Replace a Substring in a String using Regular Expression in Dart - Step by Step Examples

How to Replace a Substring in a String using Regular Expression in Dart ?

Answer

To replace all occurrences of a substring in a string using regular expression in Dart, you can use the RegExp.allMatches method along with String.replaceAllMapped method.

✐ Examples

1 Replace Substring "Hello" with "Hi"

In this example,

We create a string named str.
We define a regular expression pattern matching "Hello".
We use RegExp.allMatches to find all matches of the pattern in str.
We replace all occurrences of the pattern with "Hi" using String.replaceAllMapped method.
Finally, we print the modified string.

Dart Program

void main() {
  String str = 'Hello World Hello';
  RegExp regex = RegExp('Hello');
  String newStr = str.replaceAllMapped(regex, (match) => 'Hi');
  print(newStr);
}

Output

Hi World Hi

2 Replace Digits with 'Y'

In this example,

We create a string named str.
We define a regular expression pattern matching digits (\d).
We use RegExp.allMatches to find all matches of the pattern in str.
We replace all occurrences of the pattern with 'Y' using String.replaceAllMapped method.
Finally, we print the modified string.

Dart Program

void main() {
  String str = 'Hello123World789';
  RegExp regex = RegExp('\\d');
  String newStr = str.replaceAllMapped(regex, (match) => 'Y');
  print(newStr);
}

Output

HelloYYYWorldYYY

Summary

In this tutorial, we learned How to Replace a Substring in a String using Regular Expression in Dart language with well detailed examples.

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How to Replace a Substring in a String using Regular Expression in Dart - Step by Step Examples

How to Replace a Substring in a String using Regular Expression in Dart ?

Answer

✐ Examples

1 Replace Substring "Hello" with "Hi"

Dart Program

Output

2 Replace Digits with 'Y'

Dart Program

Output

Summary

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