using System; using System.Text.RegularExpressions; class RegexSubstitution { public static void Main() { string testString1 = " stars *****"; Regex testRegex1 = new Regex( @"\d" ); Console.WriteLine( "Original string: " + testString1 ); testString1 = Regex.Replace( testString1, @"\*", "^" ); Console.WriteLine( "^ substituted for *: " + testString1 ); } }