diff --git a/Gemfile.lock b/Gemfile.lock
index e283e8f..b050908 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -28,3 +28,6 @@ PLATFORMS
 DEPENDENCIES
   pry
   rspec
+
+BUNDLED WITH
+   1.10.3
diff --git a/parser.rb b/parser.rb
index adaad3e..944c7ae 100644
--- a/parser.rb
+++ b/parser.rb
@@ -1,3 +1,10 @@
 def word_in_string?(word, string)
   # implement with your code here
+  words = string.scan /(^|[^a-zA-Z])#{Regexp.quote(word)}($|[^a-zA-Z])/
+  case words.count>0
+  when true
+    :yes
+  else
+    :no
+  end
 end