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// <Snippet7>
using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string input = "ABC123DEF456";
string pattern = @"\d+";
string substitution = "$_";
Console.WriteLine("Original string: {0}", input);
Console.WriteLine("String with substitution: {0}",
Regex.Replace(input, pattern, substitution));
}
}
// The example displays the following output:
// Original string: ABC123DEF456
// String with substitution: ABCABC123DEF456DEFABC123DEF456
// </Snippet7>