--- a/ezodf/tableutils.py	2026-06-05 15:01:28.194083091 +0200
+++ b/ezodf/tableutils.py	2026-06-05 15:03:39.460845556 +0200
@@ -28,7 +28,7 @@
     next(generator)
     return generator
 
-CELL_ADDRESS = re.compile('^([A-Z]+)(\d+)$')
+CELL_ADDRESS = re.compile(r'^([A-Z]+)(\d+)$')
 
 def address_to_index(address):
     def column_name_to_index(colname):
--- a/ezodf/timeparser.py	2026-06-05 15:01:28.194218112 +0200
+++ b/ezodf/timeparser.py	2026-06-05 15:04:53.131271200 +0200
@@ -15,7 +15,7 @@
 DATE_FORMAT = "%Y-%m-%d"
 
 class TimeParser(object):
-    duration_matcher = re.compile("^P(\d+Y)?(\d+M)?(\d+D)?(?:T(\d+H)?(\d+M)?(\d+(?:,\d+)?S)?)?$")
+    duration_matcher = re.compile(r"^P(\d+Y)?(\d+M)?(\d+D)?(?:T(\d+H)?(\d+M)?(\d+(?:,\d+)?S)?)?$")
 
     def __init__(self, time):
         if is_string(time):