angularjs - Angular form validation not working inside a modal dialog -

i have registration form inside modal window ui-bootstrap library. trying validations working on form without success. not sure doing wrong.

here link plunker demonstrating same issue http://plnkr.co/edit/9qusvbwd0xaaryqtgui1?p=preview

you misspelled regform - regfrom, see it's working now: http://plnkr.co/edit/17yaokycc3xa0iewr24m?p=preview

correct span error message:

<span style="color:red" ng-show="regform.email.$dirty && regform.email.$invalid">     <span ng-show="regform.email.$error.required">email required.</span>     <span ng-show="regform.email.$error.email">invalid email address.</span> </span>