C# Regex.Replace String End

String type

Regex can change the ends of certain strings. With the Regex.Replace method, we use the "$" metacharacter to match the string end. This yields some capabilities that are hard to duplicate.

Regex.Replace
Input and output required

Input string: This string has something at the end<br/>
      Output: This string has something at the end

Example

Regex type

First, we can use regular expressions to remove the ending part of a string. The solution we see here uses the Regex.Replace static method, which is convenient but not optimally fast.

Static Method

Note:We combine it with the "$" character at the end, which signals the end of the string.

C# program that removes string

using System;

class Program
{
    static void Main()
    {
	// 1
	// The string you want to change.
	string s1 = "This string has something at the end<br/>";

	// 2
	// Use regular expression to trim the ending string.
	string s2 = System.Text.RegularExpressions.Regex.Replace(s1, "<br/>$", "");

	// 3
	// Display the results.
	Console.WriteLine("\"{0}\"\n\"{1}\"",
	    s1,
	    s2);
    }
}

Output

"This string has something at the end<br/>"
"This string has something at the end"
Steps

In step 1, we declare a new string that contains an ending substring we need to remove. In step 2, we call the Regex.Replace static method. In step 3, we display the resulting string copy, which has been stripped of the ending string.

Console.WriteLine

Notes on regular expression. The "$" metacharacter shown in the Regex.Replace method call forces the string in the pattern to occur at the end of the input string for the Replace to take effect.

Note:This means that the pattern won't be replaced if it occurs anywhere else in the string.

Summary

We replaced a substring that occurs at the end of an input string. This is useful for stripping markup or ending sequences that you don't want. I recommend using string-based methods for when performance is critical.


C#: Regex