create a regular expression based on the names of files in a folder in csharp

main.cs
using System;
using System.IO;
using System.Text.RegularExpressions;

class Program
{
    static void Main()
    {
        // Set the folder path
        string folderPath = @"C:\Users\Username\Documents\TestFolder";

        // Set the regular expression pattern
        string pattern = @"^File\d{3}\.txt$"; // Example: File001.txt, File002.txt

        // Get the files in the folder that match the pattern
        string[] files = Directory.GetFiles(folderPath)
                                   .Where(path => Regex.IsMatch(Path.GetFileName(path), pattern))
                                   .ToArray();

        // Do something with the files
        foreach (string file in files)
        {
            Console.WriteLine(file);
        }
    }
}
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