Update app.py

app.py

@@ -3,6 +3,7 @@ import datetime
 import requests
 import pytz
 import yaml
+import re
 from tools.final_answer import FinalAnswerTool
 
 from Gradio_UI import GradioUI
@@ -17,6 +18,7 @@ def string_counter(substring:str, bigstring:str)-> str: #it's import to specify
         bigstring: a larger string inside the first parameter is found
     """
     try:
+        # Count how many times substring is found in bigstring
         count = len(re.findall(substring, bigstring))
         return f"{substring} is found {count} times in the string {bigstring}"
     except Exception as e: