Use regex to match file patterns

Also use os.listdir as is clear recursion is not intended

deepface/modules/recognition.py

@@ -1,5 +1,6 @@
 # built-in dependencies
 import os
+import re
 import pickle
 from typing import List, Union, Optional
 import time
@@ -14,6 +15,7 @@ from deepface.commons.logger import Logger
 from deepface.modules import representation, detection, modeling, verification
 from deepface.models.FacialRecognition import FacialRecognition
 
+
 logger = Logger(module="deepface/modules/recognition.py")
 
 
@@ -303,12 +305,12 @@ def __list_images(path: str) -> list[str]:
     Returns:
         images (list): list of exact image paths
     """
-    images = []
-    for r, _, f in os.walk(path):
-        for file in f:
-            if file.lower().endswith((".jpg", ".jpeg", ".png")):
-                exact_path = os.path.join(r, file)
-                images.append(exact_path)
+    images = list[str]()
+    pattern = re.compile(r".*\.(jpg|jpeg|png)$", re.IGNORECASE)
+    for file_name in os.listdir(path):
+        if pattern.match(file_name):
+            images.append(os.path.join(path, file_name))
+    
     return images