using System;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

         string pattern = @"^(\<.{27})(\{[^}]*\})(.*)";

         string oldFile = @"\\web-extract2\Data\importBackup\CarCutter\Processed\WP1AA2AY1PDA03797\WP1AA2AY1PDA03797_35.jpg";

         string newVin = @"\WP1AA2AY1PDA03000";

         string result = Regex.Replace(oldFile, pattern, newVin);

        Console.WriteLine(oldFile);

        Console.WriteLine(result);

    }

}