Using ng-pattern to validate email in AngularJS - angularjs

Question

I'm new to Angular and have trouble getting the ng-pattern to validate the email address based on a REGEX. In fact the other default angular validation for email also changes behaviour and only shows an error if the entire field is empty when I insert ng-pattern. Initially tried using directives and controllers but found that the ng-pattern can achieve (in theory) the same effect of validating the email so decided to use this.
I have used several REGEX patterns and read about ng-pattern such as from: Regex validation of ng-patternForm validationEasy form validation and many other links but nothing works. Can anybody figure-out what I need to do to make things work ?
<form name="userForm" novalidate>
<div class="row">
<div class="large-12 medium-12 small-12 columns">
<label>Username</label>
<input type="email" name="username" placeholder="johnsmith#ashburton.com" ng-model="user.username" ng-maxlength="100" ng-model-options="{ updateOn: blur }" ng-pattern = "/^(?("")("".+?(?<!\)""#)|(([0-9a-z]((\.(?!\.))|[-!#\$%&'*\+/=\?\^`\{\}\|~\w])*)(‌​?<=[0-9a-z])#))(?([)([(\d{1,3}\.){3}\d{1,3}])|(([0-9a-z][-\w]*[0-9a-z]*\.)+[a-‌​z0-9][\-a-z0-9]{0,22}[a-z0-9]))$/" required />
<div class="error-container" ng-show="userForm.username.$dirty && userForm.username.$invalid">
<small class="error" ng-show="userForm.username.$error.required">
Your email is required.
</small>
<small class="error" ng-show="userForm.username.$error.email">
Please input a valid email.
</small>
<small class="error" ng-show="userForm.firstname.$error.maxlength">
Your email cannot be longer than 100 characters
</small>
</div>
</div>
</form>

Answer 1

Please change your ng-pattern to match this regex:
ng-pattern = '/^(([^<>()\[\]\.,;:\s#\"]+(\.[^<>()\[\]\.,;:\s#\"]+)*)|(\".+\"))#(([^<>()[\]\.,;:\s#\"]+\.)+[^<>()[\]\.,;:\s#\"]{2,})$/i'
This regex will give error if the section after # is left blank. This regex will accept unicode also.
Hope it helps.

Answer 2

There is an error with you regular expression. I used this simple email validator and it worked fine with few changes to display proper errors
<div class="row">
<div class="large-12 medium-12 small-12 columns">
<label>Username</label>
<input type="email" name="username" placeholder="johnsmith#ashburton.com" ng-model="user.username" ng-maxlength="100" ng-model-options="{ updateOn: blur }" ng-pattern="/^[a-z]+[a-z0-9._]+#[a-z]+\.[a-z.]{2,5}$/" required />
<div class="error-container" ng-show="userForm.username.$dirty && userForm.username.$error">
<small class="error" ng-show="userForm.username.$error.required">
Your email is required.
</small>
<small class="error" ng-show="userForm.username.$error.pattern">
Please input a valid email.
</small>
<small class="error" ng-show="userForm.username.$error.maxlength">
Your email cannot be longer than 100 characters
</small>
</div>
</div>
</div>

Answer 3

The problem was in my regex. I ended up using: ng-pattern='/^(([^<>()\[\]\\.,;:\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,}))$/' required />