Title: Replace text matching a pattern in C#

This example uses the following code to replace text matching a pattern within a string.

// Make the replacements. private void btnGo_Click(object sender, EventArgs e) { Regex reg_exp = new Regex(txtPattern.Text); lblResult.Text = reg_exp.Replace( txtTestString.Text, txtReplacementPattern.Text); }

This code creates a Regex object, passing its constructor a regular expression pattern that will identify the text to replace. It calls the object's Replace method, passing it the replacement pattern.

In this example, the search pattern is "[aeiouAEIOU]" and the replacement pattern is "." so the program replaces all instances of vowels with periods.

Download the example to experiment with it and to see additional details.