String.Replace Method

Reference

Definition

Namespace:: System

Assembly:: System.Runtime.dll

Assembly:: mscorlib.dll

Assembly:: netstandard.dll

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Returns a new string in which all occurrences of a specified Unicode character or String in the current string are replaced with another specified Unicode character or String.

Overloads

Replace(Char, Char)	Returns a new string in which all occurrences of a specified Unicode character in this instance are replaced with another specified Unicode character.
Replace(String, String)	Returns a new string in which all occurrences of a specified string in the current instance are replaced with another specified string.
Replace(String, String, StringComparison)	Returns a new string in which all occurrences of a specified string in the current instance are replaced with another specified string, using the provided comparison type.
Replace(String, String, Boolean, CultureInfo)	Returns a new string in which all occurrences of a specified string in the current instance are replaced with another specified string, using the provided culture and case sensitivity.

Replace(Char, Char)

Source:: String.Manipulation.cs

Source:: String.Manipulation.cs

Source:: String.Manipulation.cs

Returns a new string in which all occurrences of a specified Unicode character in this instance are replaced with another specified Unicode character.

public:
 System::String ^ Replace(char oldChar, char newChar);

public string Replace (char oldChar, char newChar);

member this.Replace : char * char -> string

Public Function Replace (oldChar As Char, newChar As Char) As String

Parameters

oldChar: Char

The Unicode character to be replaced.

newChar: Char

The Unicode character to replace all occurrences of oldChar.

Returns

String

A string that is equivalent to this instance except that all instances of oldChar are replaced with newChar. If oldChar is not found in the current instance, the method returns the current instance unchanged.

Examples

The following example creates a comma separated value list by substituting commas for the blanks between a series of numbers.

using namespace System;
int main()
{
   String^ str = "1 2 3 4 5 6 7 8 9";
   Console::WriteLine( "Original string: \"{0}\"", str );
   Console::WriteLine( "CSV string:      \"{0}\"", str->Replace( ' ', ',' ) );
}

//
// This example produces the following output:
// Original string: "1 2 3 4 5 6 7 8 9"
// CSV string:      "1,2,3,4,5,6,7,8,9"
//

string str = "1 2 3 4 5 6 7 8 9";
Console.WriteLine($"Original string: \"{str}\"");
Console.WriteLine($"CSV string:      \"{str.Replace(' ', ',')}\"");

// This example produces the following output:
// Original string: "1 2 3 4 5 6 7 8 9"
// CSV string:      "1,2,3,4,5,6,7,8,9"

let str = "1 2 3 4 5 6 7 8 9"
printfn $"Original string: \"{str}\""
printfn $"CSV string:      \"{str.Replace(' ', ',')}\""

// This example produces the following output:
// Original string: "1 2 3 4 5 6 7 8 9"
// CSV string:      "1,2,3,4,5,6,7,8,9"

Class stringReplace1
   Public Shared Sub Main()
      Dim str As [String] = "1 2 3 4 5 6 7 8 9"
      Console.WriteLine("Original string: ""{0}""", str)
      Console.WriteLine("CSV string:      ""{0}""", str.Replace(" "c, ","c))
   End Sub
End Class
' This example produces the following output:
' Original string: "1 2 3 4 5 6 7 8 9"
' CSV string:      "1,2,3,4,5,6,7,8,9"

Remarks

This method performs an ordinal (case-sensitive and culture-insensitive) search to find oldChar.

Note

This method does not modify the value of the current instance. Instead, it returns a new string in which all occurrences of oldChar are replaced by newChar.

Because this method returns the modified string, you can chain together successive calls to the Replace method to perform multiple replacements on the original string. Method calls are executed from left to right. The following example provides an illustration.

string s = new('a', 3);
Console.WriteLine($"The initial string: '{s}'");
s = s.Replace('a', 'b').Replace('b', 'c').Replace('c', 'd');
Console.WriteLine($"The final string: '{s}'");

// The example displays the following output:
//       The initial string: 'aaa'
//       The final string: 'ddd'

let s = new string('a', 3)
printfn $"The initial string: '{s}'"
let s2 = s.Replace('a', 'b').Replace('b', 'c').Replace('c', 'd')
printfn $"The final string: '{s2}'"

// The example displays the following output:
//       The initial string: 'aaa'
//       The final string: 'ddd'

Module Example
   Public Sub Main()
      Dim s As New String("a"c, 3)
      Console.WriteLine("The initial string: '{0}'", s)
      s = s.Replace("a"c, "b"c).Replace("b"c, "c"c).Replace("c"c, "d"c)
      Console.WriteLine("The final string: '{0}'", s)
   End Sub
End Module
' The example displays the following output:
'       The initial string: 'aaa'
'       The final string: 'ddd'

Applies to

Replace(String, String)

Source:: String.Manipulation.cs

Source:: String.Manipulation.cs

Source:: String.Manipulation.cs

Returns a new string in which all occurrences of a specified string in the current instance are replaced with another specified string.

public:
 System::String ^ Replace(System::String ^ oldValue, System::String ^ newValue);

public string Replace (string oldValue, string newValue);

public string Replace (string oldValue, string? newValue);

member this.Replace : string * string -> string

Public Function Replace (oldValue As String, newValue As String) As String

Parameters

oldValue: String

The string to be replaced.

newValue: String

The string to replace all occurrences of oldValue.

Returns

String

A string that is equivalent to the current string except that all instances of oldValue are replaced with newValue. If oldValue is not found in the current instance, the method returns the current instance unchanged.

Exceptions

ArgumentNullException

oldValue is null.

ArgumentException

oldValue is the empty string ("").

Examples

The following example demonstrates how you can use the Replace method to correct a spelling error.

using namespace System;
int main()
{
   String^ errString = "This docment uses 3 other docments to docment the docmentation";
   Console::WriteLine( "The original string is:\n'{0}'\n", errString );

   // Correct the spelling of S"document".
   String^ correctString = errString->Replace( "docment", "document" );
   Console::WriteLine( "After correcting the string, the result is:\n'{0}'", correctString );
}
//
// This code example produces the following output:
//
// The original string is:
// 'This docment uses 3 other docments to docment the docmentation'
//
// After correcting the string, the result is:
// 'This document uses 3 other documents to document the documentation'
//

string errString = "This docment uses 3 other docments to docment the docmentation";

Console.WriteLine($"The original string is:{Environment.NewLine}'{errString}'{Environment.NewLine}");

// Correct the spelling of "document".
string correctString = errString.Replace("docment", "document");

Console.WriteLine($"After correcting the string, the result is:{Environment.NewLine}'{correctString}'");

// This code example produces the following output:
//
// The original string is:
// 'This docment uses 3 other docments to docment the docmentation'
//
// After correcting the string, the result is:
// 'This document uses 3 other documents to document the documentation'
//

open System

let errString = "This docment uses 3 other docments to docment the docmentation"

printfn $"The original string is:{Environment.NewLine}'{errString}'{Environment.NewLine}"

// Correct the spelling of "document".

let correctString = errString.Replace("docment", "document")

printfn $"After correcting the string, the result is:{Environment.NewLine}'{correctString}'"

// This code example produces the following output:
//
// The original string is:
// 'This docment uses 3 other docments to docment the docmentation'
//
// After correcting the string, the result is:
// 'This document uses 3 other documents to document the documentation'
//

Public Class ReplaceTest
    
    Public Shared Sub Main()
        Dim errString As String = "This docment uses 3 other docments to docment the docmentation"
                
        Console.WriteLine("The original string is:{0}'{1}'{0}", Environment.NewLine, errString)

        ' Correct the spelling of "document".  
        Dim correctString As String = errString.Replace("docment", "document")
      
        Console.WriteLine("After correcting the string, the result is:{0}'{1}'", Environment.NewLine, correctString)
    End Sub
End Class
'
' This code example produces the following output:
'
' The original string is:
' 'This docment uses 3 other docments to docment the docmentation'
'
' After correcting the string, the result is:
' 'This document uses 3 other documents to document the documentation'
'

Remarks

If newValue is null, all occurrences of oldValue are removed.

Note

This method does not modify the value of the current instance. Instead, it returns a new string in which all occurrences of oldValue are replaced by newValue.

This method performs an ordinal (case-sensitive and culture-insensitive) search to find oldValue.

string s = "aaa";
Console.WriteLine($"The initial string: '{s}'");
s = s.Replace("a", "b").Replace("b", "c").Replace("c", "d");
Console.WriteLine($"The final string: '{s}'");

// The example displays the following output:
//       The initial string: 'aaa'
//       The final string: 'ddd'

let s = "aaa"
printfn $"The initial string: '{s}'"
let s2 = s.Replace("a", "b").Replace("b", "c").Replace("c", "d")
printfn $"The final string: '{s2}'"

// The example displays the following output:
//       The initial string: 'aaa'
//       The final string: 'ddd'

Module Example
   Public Sub Main()
      Dim s As String = "aaa"
      Console.WriteLine("The initial string: '{0}'", s)
      s = s.Replace("a", "b").Replace("b", "c").Replace("c", "d")
      Console.WriteLine("The final string: '{0}'", s)
   End Sub
End Module
' The example displays the following output:
'       The initial string: 'aaa'
'       The final string: 'ddd'

Applies to

Replace(String, String, StringComparison)

Source:: String.Manipulation.cs

Source:: String.Manipulation.cs

Source:: String.Manipulation.cs

Returns a new string in which all occurrences of a specified string in the current instance are replaced with another specified string, using the provided comparison type.

public:
 System::String ^ Replace(System::String ^ oldValue, System::String ^ newValue, StringComparison comparisonType);

public string Replace (string oldValue, string? newValue, StringComparison comparisonType);

public string Replace (string oldValue, string newValue, StringComparison comparisonType);

member this.Replace : string * string * StringComparison -> string

Public Function Replace (oldValue As String, newValue As String, comparisonType As StringComparison) As String

Parameters

oldValue: String

The string to be replaced.

newValue: String

The string to replace all occurrences of oldValue.

comparisonType: StringComparison

One of the enumeration values that determines how oldValue is searched within this instance.

Returns

String

Exceptions

ArgumentNullException

oldValue is null.

ArgumentException

oldValue is the empty string ("").

Remarks

If newValue is null, all occurrences of oldValue are removed.

Note

This method does not modify the value of the current instance. Instead, it returns a new string in which all occurrences of oldValue are replaced by newValue.

This method performs a search to find oldValue using the culture and case sensitivity described by comparisonType.

string s = "aaa";
Console.WriteLine($"The initial string: '{s}'");
s = s.Replace("a", "b").Replace("b", "c").Replace("c", "d");
Console.WriteLine($"The final string: '{s}'");

// The example displays the following output:
//       The initial string: 'aaa'
//       The final string: 'ddd'

let s = "aaa"
printfn $"The initial string: '{s}'"
let s2 = s.Replace("a", "b").Replace("b", "c").Replace("c", "d")
printfn $"The final string: '{s2}'"

// The example displays the following output:
//       The initial string: 'aaa'
//       The final string: 'ddd'

Module Example
   Public Sub Main()
      Dim s As String = "aaa"
      Console.WriteLine("The initial string: '{0}'", s)
      s = s.Replace("a", "b").Replace("b", "c").Replace("c", "d")
      Console.WriteLine("The final string: '{0}'", s)
   End Sub
End Module
' The example displays the following output:
'       The initial string: 'aaa'
'       The final string: 'ddd'

Applies to

Replace(String, String, Boolean, CultureInfo)

Source:: String.Manipulation.cs

Source:: String.Manipulation.cs

Source:: String.Manipulation.cs

Returns a new string in which all occurrences of a specified string in the current instance are replaced with another specified string, using the provided culture and case sensitivity.

public:
 System::String ^ Replace(System::String ^ oldValue, System::String ^ newValue, bool ignoreCase, System::Globalization::CultureInfo ^ culture);

public string Replace (string oldValue, string? newValue, bool ignoreCase, System.Globalization.CultureInfo? culture);

public string Replace (string oldValue, string newValue, bool ignoreCase, System.Globalization.CultureInfo culture);

member this.Replace : string * string * bool * System.Globalization.CultureInfo -> string

Public Function Replace (oldValue As String, newValue As String, ignoreCase As Boolean, culture As CultureInfo) As String

Parameters

oldValue: String

The string to be replaced.

newValue: String

The string to replace all occurrences of oldValue.

ignoreCase: Boolean

true to ignore casing when comparing; false otherwise.

culture: CultureInfo

The culture to use when comparing. If culture is null, the current culture is used.

Returns

String

Exceptions

ArgumentNullException

oldValue is null.

ArgumentException

oldValue is the empty string ("").

Remarks

If newValue is null, all occurrences of oldValue are removed.

Note

This method does not modify the value of the current instance. Instead, it returns a new string in which all occurrences of oldValue are replaced by newValue.

This method performs a search to find oldValue using the provided culture and ignoreCase case sensitivity.

string s = "aaa";
Console.WriteLine($"The initial string: '{s}'");
s = s.Replace("a", "b").Replace("b", "c").Replace("c", "d");
Console.WriteLine($"The final string: '{s}'");

// The example displays the following output:
//       The initial string: 'aaa'
//       The final string: 'ddd'

let s = "aaa"
printfn $"The initial string: '{s}'"
let s2 = s.Replace("a", "b").Replace("b", "c").Replace("c", "d")
printfn $"The final string: '{s2}'"

// The example displays the following output:
//       The initial string: 'aaa'
//       The final string: 'ddd'

Module Example
   Public Sub Main()
      Dim s As String = "aaa"
      Console.WriteLine("The initial string: '{0}'", s)
      s = s.Replace("a", "b").Replace("b", "c").Replace("c", "d")
      Console.WriteLine("The final string: '{0}'", s)
   End Sub
End Module
' The example displays the following output:
'       The initial string: 'aaa'
'       The final string: 'ddd'

Applies to

Share via

String.Replace Method

Definition

Overloads

Replace(Char, Char)

Parameters

Returns

Examples

Remarks

See also

Applies to

Replace(String, String)

Parameters

Returns

Exceptions

Examples

Remarks

See also

Applies to

Replace(String, String, StringComparison)

Parameters

Returns

Exceptions

Remarks

Applies to

Replace(String, String, Boolean, CultureInfo)

Parameters

Returns

Exceptions

Remarks

Applies to

Additional resources