Regex.Replace Method (String, String)

Replaces all occurrences of a specified regular expression pattern with a replacement string, starting at the first character in the input string.

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

public string Replace (
	string input,
	string replacement
public String Replace (
	String input, 
	String replacement
public function Replace (
	input : String, 
	replacement : String
) : String



The string to modify.


The replacement string.

Return Value

The modified character string.

The following code example demonstrates the Regex.Replace method.

// This code example demonstrates the System.Text.Regular-
// Expressions.Regex.Replace(String, String) method.

using System;
using System.Text.RegularExpressions;

class Sample 
    public static void Main() 
// Create a regular expression that matches a series of one 
// or more white spaces.
    string pattern = @"\s+";
    Regex rgx = new Regex(pattern);

// Declare a string consisting of text and white spaces.
    string inputStr = "a   b   c   d";

// Replace runs of white space in the input string with a
// comma and a blank.
    string outputStr = rgx.Replace(inputStr, ", ");

// Display the resulting string.
    Console.WriteLine("Pattern:       \"{0}\"", pattern);
    Console.WriteLine("Input string:  \"{0}\"", inputStr);
    Console.WriteLine("Output string: \"{0}\"", outputStr);
This code example produces the following results:

Pattern:       "\s+"
Input string:  "a   b   c   d"
Output string: "a, b, c, d"


Windows 98, Windows 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 .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0