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How to Remove All Whitespace of a String In Dart?

Earlier we have been through various articles like how to format an interpolated string in flutter so in this article we will go through how to remove all whitespace of a string in dart?


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Ruben Gray

5 months ago | 1 min read
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Earlier we have been through various articles like how to format an interpolated string in flutter so in this article we will go through how to remove all whitespace of a string in dart?

How to Remove All Whitespace of a String In Dart?

User can try the below solutions:

String product = "COCA COLA";

print('Product id is: ${product.replaceAll(new RegExp(r"\s+\b|\b\s"), "")}');

Update:

String name = '4 ever 1 k g @@ @';

print(name.replaceAll(new RegExp(r"\s+"), ""));

This would solve your problem

String name = "COCA COLA";

print(name.replaceAll(' ', ''));

Use Trim Function():

String name = "Stack Overflow";

print(name.trim());

In case this is of any help to someone in the future, for convenience you can define an extension method to the String class:

extension StringExtensions on String {

String removeWhitespace() {

return this.replaceAll(' ', '');

}

}

This can be called like product.removeWhiteSpace() I’ve used it in the past to create a helper method when sorting lists by a string whilst ignoring case and whitespace.

extension StringExtensions on String {

String toSortable() {

return this.toLowerCase().replaceAll(' ', '');

}

}

  • print(' COCA COLA'.trim()); // Output: 'COCA COLA'
    print('COCA COLA '.trim()); // Output: 'COCA COLA'
    print(' COCA COLA '.trim()); // Output: 'COCA COLA'
  • print(' COCA COLA '.trimLeft()); // Output: 'COCA COLA '
    print(' COCA COLA '.trimRight()); // Output:' COCA COLA'If the String can be null, you can consider using the null-aware operator.String s = null;
    print(s?.trim());The above code will return null instead of throwing 
    NoSuchMethodError.
  • String replaceWhitespacesUsingRegex(String s, String replace) {
    if (s == null) {
    return null;
    }

    // This pattern means "at least one space, or more"
    // \\s : space
    // + : one or more
    final pattern = RegExp('\\s+');
    return s.replaceAll(pattern, replace);
    }Call like a below:print(replaceWhitespacesUsingRegex('One Two Three Four', '')); // Output: 'OneTwoThreeFour'

Conclusion:

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In this article, we have been through how to remove all whitespace of a string in dart?

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Ruben Gray

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Hi I am Rubeen


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