diff --git a/apps/dataset/serializers/document_serializers.py b/apps/dataset/serializers/document_serializers.py
index 263f64c58..9496ac7e1 100644
--- a/apps/dataset/serializers/document_serializers.py
+++ b/apps/dataset/serializers/document_serializers.py
@@ -790,7 +790,7 @@ class DocumentSerializers(ApiMixin, serializers.Serializer):
                     {'key': '#####', 'value': "(?<=\\n)(?<!#)##### (?!#).*|(?<=^)(?<!#)##### (?!#).*"},
                     {'key': '######', 'value': "(?<=\\n)(?<!#)###### (?!#).*|(?<=^)(?<!#)###### (?!#).*"},
                     {'key': '-', 'value': '(?<! )- .*'},
-                    {'key': '空格', 'value': '(?<!\\s)\\s(?!\\s)'},
+                    {'key': '空格', 'value': '(?<! ) (?! )'},
                     {'key': '分号', 'value': '(?<!；)；(?!；)'}, {'key': '逗号', 'value': '(?<!，)，(?!，)'},
                     {'key': '句号', 'value': '(?<!。)。(?!。)'}, {'key': '回车', 'value': '(?<!\\n)\\n(?!\\n)'},
                     {'key': '空行', 'value': '(?<!\\n)\\n\\n(?!\\n)'}]