The String.Replace() method replaces a character or a string with another character or string in a string.
In C#, Strings are immutable. That means the method does not replace characters or strings from a string. The method creates and returns a new string with new characters or strings.
String.Replace() method has two overloaded forms.
Method | Description |
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. |
Example 1
The following example replaces all commas with a colon in a string.
-
- string odd = "1, 3, 5, 7, 9, 11, 13, 15, 17, 19";
- Console.WriteLine($"Original odd: {odd}");
- string newOdd = odd.Replace(',', ':');
- Console.WriteLine($"New Odd: {newOdd}");
The following example replaces all “ Beniwal” with an empty string so only first names are copied to the new string.
- string authors = "Mahesh Beniwal, Neel Beniwal, Raj Beniwal, Dinesh Beniwal";
- Console.WriteLine($"Authors with last names: {authors}");
-
- string firstNames = authors.Replace(" Beniwal", "");
- Console.WriteLine($"Authors without last names: {firstNames}");
The complete program is listed in Listing 1.
- using System;
- namespace ReplaceStringSample {
- class Program {
- static void Main(string[] args) {
-
-
- string odd = "1, 3, 5, 7, 9, 11, 13, 15, 17, 19";
- Console.WriteLine($ "Original odd: {odd}");
- string newOdd = odd.Replace(',', ':');
- Console.WriteLine($ "New Odd: {newOdd}");
- string authors = "Mahesh Beniwal, Neel Beniwal, Raj Beniwal, Dinesh Beniwal";
- Console.WriteLine($ "Authors with last names: {authors}");
-
- string firstNames = authors.Replace(" Beniwal", "");
- Console.WriteLine($ "Authors without last names: {firstNames}");
- Console.ReadKey();
- }
- }
- }
Listing 1.
The output of Listing 1 looks like Figure 1.
Figure 1.