[C#] 폴더에서 이미지 파일만 가져오기

using System.Collections.Generic; using System.IO; using System.Text.RegularExpressions;   namespace TEST {     class Function     {         public static List<string> GetImageFiles(string directoryPath)         {             List<string> imageFileList = new List<string>();               foreach (string fileName in Directory.GetFiles(directoryPath))             {                 if (Regex.IsMatch(fileName, @".jpg|.png|.bmp|.JPG|.PNG|.BMP|.JPEG|.jpeg$"))                 {                     imageFileList.Add(fileName);                 }             }               return imageFileList;         }     } }