diff --git a/src/main/java/com/knowledge/base/application/service/LLMAppServiceImpl.java b/src/main/java/com/knowledge/base/application/service/LLMAppServiceImpl.java
index 24607e2..aa26829 100644
--- a/src/main/java/com/knowledge/base/application/service/LLMAppServiceImpl.java
+++ b/src/main/java/com/knowledge/base/application/service/LLMAppServiceImpl.java
@@ -157,7 +157,9 @@ public class LLMAppServiceImpl implements LLMAppService {
      */
     public static List<String> extractKeywords(String text) {
         List<String> keywords = new ArrayList<>();
-        Pattern pattern = Pattern.compile(ConstantConfig.KEYWORD_PATTERN_LEFT + "(.*?)" + ConstantConfig.KEYWORD_PATTERN_RIGHT);
+        String left = ConstantConfig.KEYWORD_PATTERN_LEFT;
+        String right = ConstantConfig.KEYWORD_PATTERN_RIGHT;
+        Pattern pattern = Pattern.compile(Pattern.quote(left) + "(.*?)" + Pattern.quote(right));
         Matcher matcher = pattern.matcher(text);
         while (matcher.find()) {
             keywords.add(matcher.group(1));