diff --git a/logprep/filter/lucene_filter.py b/logprep/filter/lucene_filter.py
index 37405eb4a..703eec5fb 100644
--- a/logprep/filter/lucene_filter.py
+++ b/logprep/filter/lucene_filter.py
@@ -1,5 +1,5 @@
 # pylint: disable=anomalous-backslash-in-string
-"""
+r"""
 Filter
 ======
 
@@ -91,13 +91,13 @@
     regex_fields:
     - ip_address
 """
+import logging
 import re
 from itertools import chain, zip_longest
 
 # pylint: enable=anomalous-backslash-in-string
 from typing import List, Optional, Union
 
-import logging
 import luqum
 from luqum.parser import IllegalCharacterError, ParseSyntaxError, parser
 from luqum.tree import (
@@ -107,7 +107,6 @@
     Not,
     OrOperation,
     Phrase,
-    Regex,
     SearchField,
     Word,
 )
diff --git a/logprep/processor/dissector/rule.py b/logprep/processor/dissector/rule.py
index 943a5e925..6f6d8bbba 100644
--- a/logprep/processor/dissector/rule.py
+++ b/logprep/processor/dissector/rule.py
@@ -1,4 +1,4 @@
-"""
+r"""
 Rule Configuration
 ^^^^^^^^^^^^^^^^^^
 
diff --git a/logprep/processor/generic_resolver/rule.py b/logprep/processor/generic_resolver/rule.py
index 255b7337b..e9f9c9efe 100644
--- a/logprep/processor/generic_resolver/rule.py
+++ b/logprep/processor/generic_resolver/rule.py
@@ -1,4 +1,4 @@
-"""
+r"""
 Rule Configuration
 ^^^^^^^^^^^^^^^^^^
 
@@ -91,7 +91,7 @@
 import re
 from functools import cached_property
 from pathlib import Path
-from typing import Optional, Tuple, List
+from typing import List, Optional, Tuple
 
 from attrs import define, field, validators
 
diff --git a/tests/acceptance/test_error_output.py b/tests/acceptance/test_error_output.py
index 7ae1a085b..805571ff7 100644
--- a/tests/acceptance/test_error_output.py
+++ b/tests/acceptance/test_error_output.py
@@ -100,7 +100,7 @@ def test_error_output_errors_are_logged_if_error_output_has_an_error(
     proc = start_logprep(config_path)
     wait_for_output(
         proc,
-        ".*\[Error Event\] Couldn't enqueue error item due to:.*",
+        r".*\[Error Event\] Couldn't enqueue error item due to:.*",
         test_timeout=30,
         forbidden_outputs=[],
     )