diff --git a/lib/client/edit.js b/lib/client/edit.js
index 404492cd..51938cc1 100644
--- a/lib/client/edit.js
+++ b/lib/client/edit.js
@@ -179,7 +179,7 @@ var CloudCmd, Util, join, DOM, CloudFunc, ace, DiffProto, diff_match_patch, Zip,
                 regExp  = new RegExp(regStr);
             
             if (isStr)
-                isMatch = mode.match(regExp);
+                isMatch = regExp.test(mode);
             
             Session.setUseWorker(isMatch);
         }