diff --git a/core/engine.py b/core/engine.py
index f20f57d..07d0918 100644
--- a/core/engine.py
+++ b/core/engine.py
@@ -29,6 +29,7 @@ RAG 核心引擎
 
 import os
 import gc
+import re
 import time
 import logging
 import threading