diff --git a/lib/floki/selector.ex b/lib/floki/selector.ex
index 706e1659..8d5f38af 100644
--- a/lib/floki/selector.ex
+++ b/lib/floki/selector.ex
@@ -144,7 +144,7 @@ defmodule Floki.Selector do
   defp do_classes_matches?(nil, _classes), do: false
 
   defp do_classes_matches?(class_attr_value, classes) do
-    classes -- String.split(class_attr_value, ~r/\s+/) == []
+    classes -- String.split(class_attr_value, [" ", "\t", "\n"]) == []
   end
 
   defp attributes_matches?(_node, []), do: true
diff --git a/lib/floki/selector/attribute_selector.ex b/lib/floki/selector/attribute_selector.ex
index 5e8da68c..70e8e049 100644
--- a/lib/floki/selector/attribute_selector.ex
+++ b/lib/floki/selector/attribute_selector.ex
@@ -63,7 +63,7 @@ defmodule Floki.Selector.AttributeSelector do
     s.attribute
     |> get_value(attributes)
     # Splits by whitespaces ("a  b c" -> ["a", "b", "c"])
-    |> String.split(~r/\s+/)
+    |> String.split([" ", "\t", "\n"])
     |> Enum.any?(fn v -> String.downcase(v) == selector_value end)
   end
 
@@ -103,7 +103,7 @@ defmodule Floki.Selector.AttributeSelector do
 
   def match?(attributes, s = %AttributeSelector{match_type: :includes, value: value}) do
     get_value(s.attribute, attributes)
-    |> String.split(~r/\s+/)
+    |> String.split([" ", "\t", "\n"])
     |> Enum.any?(fn v -> v == value end)
   end