Add a recipe to count occurrences of a given string within a message

Author: Data-Meister

chapters/strings/finding-substrings.md

@@ -24,8 +24,14 @@ message.indexOf "This", 5
 message.lastIndexOf "This"
 # => 49
 
-{% endhighlight %}
 
-## Discussion
+# Count occurrences of a given string
+
+    substrCount = (str, subStr) ->
+      re = new RegExp( subStr ,"g" )
+      ( str.match(re) or [] ).length
 
-Still need recipe to count occurrences of a given string within a message.
+substrCount message, " a "
+# => 3
+
+{% endhighlight %}