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, "stars", "carets" );
Console.WriteLine( "\"carets\" substituted for \"stars\": " + testString1 );
}
}