diff --git a/lodash.js b/lodash.js
index 06a699346..d3d943f09 100644
--- a/lodash.js
+++ b/lodash.js
@@ -499,7 +499,7 @@
     var reNative = RegExp('^' +
       String(toString)
         .replace(/[.*+?^${}()|[\]\\]/g, '\\$&')
-        .replace(/toString| for [^\]]+/g, '.*?') + '$'
+        .replace(/\b(function)\b.*?(?=\\\()| for .+?(?=\\\])|\btoString\b/g, '$1.*?') + '$'
     );
 
     /** Native method shortcuts */