diff --git a/lib/util.js b/lib/util.js
index aa16333c..813ea2d4 100644
--- a/lib/util.js
+++ b/lib/util.js
@@ -494,14 +494,15 @@
          * @param notEscape
          */
         this.replaceStr             = function(str, from, to, notEscape) {
-            var isStr   = Util.isString(str),
-                regExp  = new RegExp(from, 'g');
+            var regExp,
+                isStr   = Util.isString(str);
             
             if (isStr && from) {
                 if (!notEscape)
                     from = Util.escapeRegExp(from);
                 
-                str = str.replace(regExp, to);
+                regExp  = new RegExp(from, 'g');
+                str     = str.replace(regExp, to);
             }
            
            return str;