Use regular expression to replace first 3 digits

 

using System;
using System.Text.RegularExpressions;

class RegexSubstitution
{
   public static void Main()
   {
      string testString1 = "1, 2, 3, 4, 5, 6, 7, 8";
      Regex testRegex1 = new Regex( @"\d" );

      Console.WriteLine( "Original string: " + testString1 );
      Console.WriteLine( "Replace first 3 digits by \"digit\": " + testRegex1.Replace( testString1, "digit", 3 ) );
   }
}

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Use regular expression to replace first 3 digits : Regular Expression « Development Class « C# / C Sharp

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