♻️(backend) factorize regex used in the S3 event parser

Avoid duplicating patterns that match the same logical unit by
sharing common parts between the two regexes.

This logical factorization improves maintainability and ensures
consistent parsing behavior across S3 event handlers.

src/backend/core/recording/event/parsers.py

@@ -9,6 +9,8 @@ from typing import Any, Dict, Optional, Protocol
 from django.conf import settings
 from django.utils.module_loading import import_string
 
+from core.enums import FILE_EXT_REGEX, UUID_REGEX
+
 from .exceptions import (
     InvalidBucketError,
     InvalidFilepathError,
@@ -86,7 +88,7 @@ class MinioParser:
 
         # pylint: disable=line-too-long
         self._filepath_regex = re.compile(
-            r"(?P<url_encoded_folder_path>(?:[^%]+%2F)+)?(?P<recording_id>[0-9a-fA-F\-]{36})\.(?P<extension>[a-zA-Z0-9]+)"
+            rf"(?P<url_encoded_folder_path>(?:[^%]+%2F)+)?(?P<recording_id>{UUID_REGEX})\.(?P<extension>{FILE_EXT_REGEX})"
         )
 
     @staticmethod