anchor.diff:  
         <div class="form-group" ng-class="{'has-error': userForm['user[email]'].$dirty && userForm['user[email]'].$invalid}">
           <div class="input-group">
  -          <span class="input-group-addon"><i class="fa fa-envelope"></i> </span>
  +          <span class="input-group-addon"><i class="fa fa-envelope"></i> <span class="exponent"><i class="fa fa-asterisk" aria-hidden="true"></i></span></span>
             <input type="email"
                    name="user[email]"
                    ng-model="user.email"
  
positive.code: 
        <div class="form-group" ng-if="user.profile.organization" ng-class="{'has-error': userForm['user[profile_attributes][organization_attributes][name]'].$dirty && userForm['user[profile_attributes][organization_attributes][name]'].$invalid}">
          <div class="input-group">
            <span class="input-group-addon"><i class="fa fa-building-o"></i></span>
            <input type="hidden"
                   name="user[profile_attributes][organization_attributes][id]"
                   ng-value="user.profile.organization.id" />
  
negative.code: 
        <div class="form-group" ng-if="user.profile.organization" ng-class="{'has-error': userForm['user[profile_attributes][organization_attributes][address_attributes][address]'].$dirty && userForm['user[profile_attributes][organization_attributes][address_attributes][address]'].$invalid}">
          <div class="input-group">
            <span class="input-group-addon"><i class="fa fa-map-marker"></i> <span class="exponent"><i class="fa fa-asterisk" aria-hidden="true"></i></span></span>
            <input type="hidden"
                   name="user[profile_attributes][organization_attributes][address_attributes][id]"
                   ng-value="user.profile.organization.address.id" />
  