diff --git a/src/v2/cookbook/form-validation.md b/src/v2/cookbook/form-validation.md
index bc732fb98b..e8417fd036 100644
--- a/src/v2/cookbook/form-validation.md
+++ b/src/v2/cookbook/form-validation.md
@@ -206,7 +206,7 @@ const app = new Vue({
       e.preventDefault();
     },
     validEmail: function (email) {
-      var re = /^(([^<>()[\]\\.,;:\s@"]+(\.[^<>()[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
+      var re = /^(([^<>()[\]\\.,;:\s@"]+(\.[^<>()[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
       return re.test(email);
     }
   }