Update app.py

app.py

@@ -157,8 +157,15 @@ def quantizeEffectiveness(url):
     # 10. Vote on video effectiveness
     result, confidence = vote(test_point, _test)
     return result, confidence
+
+def is_valid_youtube_url(text):
+    youtube_regex = re.compile(r"^(https?://)?(www\.)?(youtube\.com/watch\?v=|youtu\.be/|youtube\.com/embed/|youtube\.com/v/|youtube\.com/user/[^/]+/u/)?([^/&?=\s]{11})$")
+    return bool(youtube_regex.match(text))
     
 def greet(url):
+    if not is_valid_youtube_url(text):
+        return "Please input a valid YouTube URL"
+        
     result, confidence = quantizeEffectiveness(url)
     
     return f"The video (ID: {getID(url)}) is {result} with a confidence of {round(confidence*100,2)}%"