anchor.diff:                     ng-model="user.profile.viadeo"
                      class="form-control"
                      id="user_viadeo"
  +                   ng-pattern="/^https?:\/\/.*?viadeo/"
                      placeholder="{{ 'viadeo' | translate }}"
                      ng-disabled="preventField['profile.viadeo'] && user.profile.first_name && !userForm['user[profile_attributes][viadeo]'].$dirty"
               />
  
positive.code:                  ng-model="user.profile.website"
                   class="form-control"
                   id="user_website"
                   placeholder="{{ 'website' | translate }}"
                   ng-disabled="preventField['profile.website'] && user.profile.website && !userForm['user[profile_attributes][website]'].$dirty"/>
          </div>
  
negative.code:                    ng-model="user.profile.instagram"
                     class="form-control"
                     id="user_instagram"
                     ng-pattern="/^https?:\/\/.*?instagram/"
                     placeholder="{{ 'instagram' | translate }}"
                     ng-disabled="preventField['profile.instagram'] && user.profile.first_name && !userForm['user[profile_attributes][instagram]'].$dirty"
              />
  