diff --git a/mkdocs_include_dir_to_nav/include_dir_to_nav.py b/mkdocs_include_dir_to_nav/include_dir_to_nav.py
index 5871f7b..62ead1a 100644
--- a/mkdocs_include_dir_to_nav/include_dir_to_nav.py
+++ b/mkdocs_include_dir_to_nav/include_dir_to_nav.py
@@ -15,7 +15,7 @@ class IncludeDirToNav(BasePlugin):
 
     config_scheme = (
         ("flat", config_options.Type(bool, default=False)),
-        ("file_pattern", config_options.Type(str, default='.*\.md$')),
+        ("file_pattern", config_options.Type(str, default=r'.*\.md$')),
         ("file_name_as_title", config_options.Type(bool, default=True)),
         ("recurse", config_options.Type(bool, default=True)),
         ("sort_file", config_options.Type(bool, default=True)),
@@ -48,7 +48,7 @@ def on_files(self, files, config):
 #### If Yes, get direct files and direct directory, and insert it to nav
 #### If direct directory was finding, recall parse with current index, in order to subCheck needsted folder
 #### Take care of direct notation ( - myFolder ) and page title notation ( - my folder : myFolder)
-def parse(ori_nav,config, pattern: str = '.*\.md$', flat: bool = False, previous=None, file_name_as_title: bool=False, recurse: bool=True, reverse_sort_file: bool=False, reverse_sort_directory: bool=False, sort_file: bool=True, sort_directory: bool=True, include_empty_dir: bool=False):
+def parse(ori_nav,config, pattern: str = r'.*\.md$', flat: bool = False, previous=None, file_name_as_title: bool=False, recurse: bool=True, reverse_sort_file: bool=False, reverse_sort_directory: bool=False, sort_file: bool=True, sort_directory: bool=True, include_empty_dir: bool=False):
     log.debug("IncludeDirToNav : ##START Parse state###")
     log.debug(f"IncludeDirToNav : ori_nav = {ori_nav} | previous = {previous} | type of ori_nav {type(ori_nav)}")
 
@@ -176,4 +176,4 @@ def _check_subitem(item_to_check: str, pattern: str):
             log.debug(f"IncludeDirToNav_generate_nav : Dir have concerned subfile ({item_to_check})")
             return True
     log.debug(f"IncludeDirToNav_generate_nav : Dir not have subfile, do not add it ({item_to_check})")
-    return False
\ No newline at end of file
+    return False