diff --git a/yamllint/rules/float_values.py b/yamllint/rules/float_values.py
index 7c7c60cc..5f2c44e8 100644
--- a/yamllint/rules/float_values.py
+++ b/yamllint/rules/float_values.py
@@ -106,13 +106,13 @@
 }
 
 IS_NUMERAL_BEFORE_DECIMAL_PATTERN = (
-    re.compile('[-+]?(\\.[0-9]+)([eE][-+]?[0-9]+)?$')
+    re.compile(r'[-+]?(\.[0-9]+)([eE][-+]?[0-9]+)?$')
 )
 IS_SCIENTIFIC_NOTATION_PATTERN = re.compile(
-    '[-+]?(\\.[0-9]+|[0-9]+(\\.[0-9]*)?)([eE][-+]?[0-9]+)$'
+    r'[-+]?(\.[0-9]+|[0-9]+(\.[0-9]*)?)([eE][-+]?[0-9]+)$'
 )
-IS_INF_PATTERN = re.compile('[-+]?(\\.inf|\\.Inf|\\.INF)$')
-IS_NAN_PATTERN = re.compile('(\\.nan|\\.NaN|\\.NAN)$')
+IS_INF_PATTERN = re.compile(r'[-+]?(\.inf|\.Inf|\.INF)$')
+IS_NAN_PATTERN = re.compile(r'(\.nan|\.NaN|\.NAN)$')
 
 
 def check(conf, token, prev, next, nextnext, context):