Remove all whitespace from a string in C#

This post will discuss how to remove all whitespace from a string in C#.

There are several ways to remove whitespace from a string in C#, which consists of the space character, the horizontal tab \t, the carriage return \r, line feed \n, etc.

1. Using Regex

The regular-expression pattern for whitespace characters is \s. Using this pattern in a regex, we can either replace consecutive whitespace with a single space or remove all whitespace from the input string.

The following code example demonstrates how to remove all whitespace from the input string.

using System;

using System.Text.RegularExpressions;

public static class Extensions

{

public static string RemoveWhiteSpaces(this string str) {

return Regex.Replace(str, @"\s+", String.Empty);

}

public class Example

{

public static void Main()

{

string str = @"Hell o

World !";

string s = str.RemoveWhiteSpaces();

Console.WriteLine(s);

}

Output: HelloWorld!

Download Run Code

it is recommended to pre-compile the regular expression to use it more than once.

using System;

using System.Text.RegularExpressions;

public static class Extensions

{

private static readonly Regex regex = new Regex(@"\s+");

public static string RemoveWhiteSpaces(this string str) {

return regex.Replace(str, String.Empty);

}

public class Example

{

public static void Main()

{

string str = @"Hell o

World !";

string s = str.RemoveWhiteSpaces();

Console.WriteLine(s);

}

Output: HelloWorld!

Download Run Code

To replace consecutive whitespaces with a single space in the input string, we can pass a single space string:

using System;

using System.Text.RegularExpressions;

public static class Extensions

{

private static readonly Regex regex = new Regex(@"\s+");

public static string RemoveWhiteSpaces(this string str) {

return regex.Replace(str, " ");

}

public class Example

{

public static void Main()

{

string str = @"Hell o

World !";

string s = str.RemoveWhiteSpaces();

Console.WriteLine(s);

}

Output: Hell o World !

Download Run Code

2. Using LINQ

We can use LINQ’s Where() method to filter non-whitespace characters from a string using Char.IsWhiteSpace and collect it with the help of the String.Concat() method.

using System;

using System.Linq;

public static class Extensions

{

public static string RemoveWhiteSpaces(this string str) {

return String.Concat(str.Where(c => !Char.IsWhiteSpace(c)));

}

public class Example

{

public static void Main()

{

string str = @"Hell o

World !";

string withoutSpace = str.RemoveWhiteSpaces();

Console.WriteLine(withoutSpace);

}

Output: Hell o World !

Download Run Code

That’s all about removing all whitespace from a string in C#.

Remove all whitespace from a string in C#

1. Using Regex

2. Using LINQ

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