diff --git a/plugins/backup_ftp/class/ftp_client.py b/plugins/backup_ftp/class/ftp_client.py
index 2dc603911..53a0e7ea8 100644
--- a/plugins/backup_ftp/class/ftp_client.py
+++ b/plugins/backup_ftp/class/ftp_client.py
@@ -140,7 +140,7 @@ class FtpPSClient:
             "database": "db",
             "path": "path",
         }
-        file_regx = prefix_dict.get(data_type) + "_(.+)_20\d+_\d+\."
+        file_regx = prefix_dict.get(data_type) + r"_(.+)_20\d+_\d+\."
         sub_search = re.search(file_regx, file_name)
         sub_path_name = ""
         if sub_search: