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Regex.Replace Method (String, String, Int32, Int32)

Within a specified input substring, replaces a specified maximum number of strings that match a regular expression pattern with a specified replacement string.

Namespace: System.Text.RegularExpressions
Assembly: System (in system.dll)

Public Function Replace ( _
	input As String, _
	replacement As String, _
	count As Integer, _
	startat As Integer _
) As String
Dim instance As Regex
Dim input As String
Dim replacement As String
Dim count As Integer
Dim startat As Integer
Dim returnValue As String

returnValue = instance.Replace(input, replacement, count, startat)
public String Replace (
	String input, 
	String replacement, 
	int count, 
	int startat
public function Replace (
	input : String, 
	replacement : String, 
	count : int, 
	startat : int
) : String
Not applicable.



The string to search for a match.


The replacement string.


Maximum number of times the replacement can occur.


The character position in the input string where the search begins.

Return Value

A new string that is identical to the input string, except that a replacement string takes the place of each matched string.

Exception typeCondition


input is a null reference (Nothing in Visual Basic).


replacement is a null reference (Nothing in Visual Basic).

The search for matches starts in the input parameter string at the position specified by the startat parameter. The regular expression is the pattern defined by the constructor for the current Regex object. If count is negative, replacements continue to the end of the string.

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

XNA Framework

Supported in: 1.0