--- a/backupchecker/placeholder.py
+++ b/backupchecker/placeholder.py
@@ -84,7 +84,7 @@
                 __found = True
         self.__path = '/'.join(__newpath)
         __head, __tail = os.path.split(self.__path)
-        __tail = __tail.replace('%i', "([\d]+)")
+        __tail = __tail.replace('%i', r"([\d]+)")
         for __file in os.listdir(__head):
             if re.search(__tail, __file):
                 __res = re.search(__tail, __file)