diff --git a/nanobot/channels/feishu.py b/nanobot/channels/feishu.py
index f8868dbaf..060ba2bb5 100644
--- a/nanobot/channels/feishu.py
+++ b/nanobot/channels/feishu.py
@@ -485,7 +485,9 @@ class FeishuChannel(BaseChannel):
             key = mention.key or None
             if not key:
                 continue
-            pattern = rf"{re.escape(key)}(?=\s|$)"
+            # Feishu placeholders are numbered keys like @_user_1. Keep
+            # punctuation-adjacent mentions valid without matching @_user_10.
+            pattern = rf"{re.escape(key)}(?![A-Za-z0-9_])"
             if not re.search(pattern, text):
                 continue
 
@@ -532,7 +534,7 @@ class FeishuChannel(BaseChannel):
         candidate = text.lstrip()
         for mention in mentions:
             key = getattr(mention, "key", None) or ""
-            if not key or not re.match(rf"{re.escape(key)}(?=\s|$)", candidate):
+            if not key or not re.match(rf"{re.escape(key)}(?![A-Za-z0-9_])", candidate):
                 continue
             if not self._is_bot_mention_event(mention):
                 continue
diff --git a/tests/channels/test_feishu_mentions.py b/tests/channels/test_feishu_mentions.py
index a49e76ee6..0404e87ec 100644
--- a/tests/channels/test_feishu_mentions.py
+++ b/tests/channels/test_feishu_mentions.py
@@ -44,6 +44,12 @@ class TestResolveMentions:
         assert "@_user_1" not in result
         assert "@_user_2" not in result
 
+    def test_mention_before_punctuation_replaced(self):
+        text = "hello @_user_1, are you there?"
+        mentions = [_mention("@_user_1", "Alice", open_id="ou_a")]
+        result = FeishuChannel._resolve_mentions(text, mentions)
+        assert result == "hello @Alice (ou_a), are you there?"
+
     def test_no_mentions_returns_text(self):
         assert FeishuChannel._resolve_mentions("hello world", None) == "hello world"
         assert FeishuChannel._resolve_mentions("hello world", []) == "hello world"