fix: refine user ID extraction logic in create_submit_tab function

app.py

@@ -596,8 +596,9 @@ def create_submit_tab(tab_id: int, demo: gr.Blocks):
             # Check if user is logged in
             if not current_user_display:
                 return styled_error("Please log in before submitting.")
-            reg = re.compile(r"\*\*(.+)\*\*")
-            user_id_match = reg.match(current_user_display)
+            # Extract user_id from "Submitter ID: **{user_id}**" format
+            reg = re.compile(r"\*\*(.+?)\*\*")
+            user_id_match = reg.search(current_user_display)
             if not user_id_match:
                 msg = f'Unable to get user ID ("{current_user_display!s}"). Please try logging in again.'
                 return styled_error(msg)