How to remove all whitespace of a string in Dart?

Question

Using trim() to eliminate white space in Dart and it doesn't work. What am I doing wrong or is there an alternative?

       String product = "COCA COLA";

       print('Product id is: ${product.trim()}');

Console prints: Product id is: COCA COLA

trim() removes the spaces from beginning and end of string. It doesn't effect the spaces within. — Cetin Basoz, Jul 24 '18 at 22:23

score 83 · Answer 1 · edited Jan 03 '21 at 21:58

83

This would solve your problem

String name = "COCA COLA";
print(name.replaceAll(' ', ''));

edited Jan 03 '21 at 21:58

Christopher Moore

15,626
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answered Dec 26 '19 at 21:59

Kofi Nartey

2,529
2
9
5

How remove different occurence in same string? Like my string is "hello%25sachin%20here " , I wanti ti remove '%25' and '%20" both ...... – Sachin Jun 15 '20 at 07:25

score 64 · Accepted Answer · edited Sep 05 '21 at 08:07

64

Try this

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(RegExp(r"\s+"), ""));

Another easy solution:

String name = '4 ever 1 k g @@ @';
print(name.replaceAll(' ', '');

edited Sep 05 '21 at 08:07

Tanvir Mahin

78
6

answered Jul 24 '18 at 22:31

Fobos

1,076
8
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1

Do not worry, it's a pleasure – Fobos Jul 25 '18 at 08:54
this is not work.. try this one `String name = '4 ever 1 k g @@ @'; print(name.replaceAll(new RegExp(r"\s+\b|\b\s"), ""));` – BIS Tech May 04 '20 at 17:56
@Fobos white space not removed , plz share other RegExp – Furkan Jun 24 '20 at 06:22
@FurkanVijapura try this: String name = '4 ever 1 k g @@ @'; print(name.replaceAll(new RegExp(r"\s+"), "")); – Fobos Jun 29 '20 at 08:44
So.. should go with the update one? what is the difference? – Ryde Oct 30 '20 at 21:45

score 11 · Answer 3 · answered Jul 24 '18 at 22:27

11

the Trim method just remove the leading and trailing. Use Regexp instide: Here is an example: Dart: Use regexp to remove whitespaces from string

answered Jul 24 '18 at 22:27

ShrJamal

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score 9 · Answer 4 · answered Jun 15 '21 at 11:37

I know that this question has pretty good answers, but I want to show a fancy way to remove all whitespace in a string. I actually thought that Dart should've had a built-in method to handle this, so I created the following extension for String class:

extension ExtendedString on String {
  /// The string without any whitespace.
  String removeAllWhitespace() {
    // Remove all white space.
    return this.replaceAll(RegExp(r"\s+"), "");
  }
}

Now, you can use it in a very simple and neat way:

String product = "COCA COLA";
print('Product id is: ${product.removeAllWhitespace()}');

score 5 · Answer 5 · answered Sep 16 '20 at 21:26

5

You can try this:

String product = "COCA COLA";

print(product.split(" ").join(""));   // COCACOLA

answered Sep 16 '20 at 21:26

mdev

51
1
4

score 4 · Answer 6 · answered Feb 10 '22 at 20:06

4

var s = "Coca Cola"; s.replaceAll(' ','');

answered Feb 10 '22 at 20:06

Sbr777

51
2

First off, `s` is unchanged after this runs. Second, even if this did work, does this really add anything over the top answer? – General Grievance Feb 14 '22 at 15:06

score 3 · Answer 7 · answered Jun 17 '20 at 10:43

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(' ', '');
  }
}

score 2 · Answer 8 · answered Dec 03 '21 at 11:05

There are so many ways to do this.

The most obvious one:

String product = "COCA COLA";
print('Product id is: ${product.replaceAll(' ', '')}');  // COCACOLA

With regular function:

String removeAllWhitespaces(String string) {
  return string.replaceAll(' ', '');
}

String product = "COCA COLA";
print('Product id is: ${removeAllWhitespaces(product)}');  // COCACOLA

With extension method:

extension StringRemoveWhitespace on String { 
String get removeAllWhitespaces => replaceAll(' ', '');  // COCACOLA
}

String product = "COCA COLA";
print('Product id is: ${product.removeAllWhitespaces}');

score -3 · Answer 9 · answered Jul 05 '19 at 13:55

-3

Use Trim Function

String name = "Stack Overflow";
print(name.trim());

answered Jul 05 '19 at 13:55

SilenceCodder

2,874
24
28

12

trim just removes spaces at the beginning and at the end of string – temirbek Aug 30 '19 at 07:21
6

bad answer. I downvoted this because the question is about removing all white spaces including middle ones. trim() only removes leading and tailing whitespaces. – Rami Mohamed May 25 '20 at 20:37
Trim removes spaces at the end and beginning and not in between – George Feb 17 '22 at 05:03

How to remove all whitespace of a string in Dart?

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