diff --git a/elementpath/regex/patterns.py b/elementpath/regex/patterns.py
index d4fbe00..f9177f9 100644
--- a/elementpath/regex/patterns.py
+++ b/elementpath/regex/patterns.py
@@ -122,7 +122,7 @@ def parse_character_class() -> CharacterClass:
     while pos < pattern_len:
         ch = pattern[pos]
         if ch == '.':
-            regex.append(ch if dot_all else '[^\r\n]')
+            regex.append(ch if dot_all else r'[^\r\n]')
         elif ch in ('^', '$'):
             if not anchors:
                 regex.append(r'\%s' % ch)
diff --git a/tests/test_regex.py b/tests/test_regex.py
index c9a5773..b8e0646 100644
--- a/tests/test_regex.py
+++ b/tests/test_regex.py
@@ -626,7 +626,7 @@ def test_issue_079(self):
 
     def test_dot_wildcard(self):
         regex = translate_pattern('.+', anchors=False)
-        self.assertEqual(regex, '^([^\r\n]+)$(?!\\n\\Z)')
+        self.assertEqual(regex, '^([^\\r\\n]+)$(?!\\n\\Z)')
         pattern = re.compile(regex)
         self.assertIsNone(pattern.search('line1\rline2\r'))
         self.assertIsNone(pattern.search('line1\nline2'))
@@ -635,7 +635,7 @@ def test_dot_wildcard(self):
         self.assertEqual(pattern.search('abc').group(0), 'abc')
 
         regex = translate_pattern('.+T.+(Z|[+-].+)', anchors=False)
-        self.assertEqual(regex, '^([^\r\n]+T[^\r\n]+(Z|[\\+\\-][^\r\n]+))$(?!\\n\\Z)')
+        self.assertEqual(regex, '^([^\\r\\n]+T[^\\r\\n]+(Z|[\\+\\-][^\\r\\n]+))$(?!\\n\\Z)')
         pattern = re.compile(regex)
         self.assertEqual(pattern.search('12T0A3+36').group(0), '12T0A3+36')
         self.assertEqual(pattern.search('12T0A3Z').group(0), '12T0A3Z')
@@ -903,7 +903,7 @@ def test_anchors(self):
 
     def test_lazy_quantifiers(self):
         regex = translate_pattern('.*?')
-        self.assertEqual(regex, '[^\r\n]*?')
+        self.assertEqual(regex, '[^\\r\\n]*?')
         regex = translate_pattern('[a-z]{2,3}?')
         self.assertEqual(regex, '[a-z]{2,3}?')
         regex = translate_pattern('[a-z]*?')