Update app.py

app.py

@@ -21,7 +21,7 @@ def preprocess_for_bm25(text):
     text = text.replace("...", " _ELLIPSIS_ ")  
 
     # Add space before and after punctuation (except "_ELLIPSIS_")
-    text = re.sub(r'([.,!?()\'"])', r' \1', text)  # General case for punctuation
+    text = re.sub(r'([.,!?()"\'])', r' \1', text)  # General case for punctuation
     #text = text.replace("'s", " 's") 
 
     # Restore "..." from the placeholder