refactor: move re import from app.py to global_config.py

To centralize the regex functionality within the app, the `re` module import has been relocated from `app.py` to `global_config.py`. This improves maintainability by reducing redundancy and ensuring consistent usage of regex across the application.

app.py

@@ -6,7 +6,6 @@ import logging
 import os
 import pathlib
 import random
-import re
 import tempfile
 from typing import List, Union
 

global_config.py

@@ -3,6 +3,7 @@ A set of configurations used by the app.
 """
 import logging
 import os
+import re
 
 from dataclasses import dataclass
 from dotenv import load_dotenv