quay/config_app/js/config-field-templates/config-string-field.html

<div class="config-string-field-element">
  <form name="fieldform" novalidate>
    <input type="text" class="form-control" placeholder="{{ placeholder || '' }}"
           ng-model="binding" ng-trim="false" ng-minlength="1"
           ng-pattern="getRegexp(pattern)" ng-required="!isOptional">
    <div class="alert alert-danger" ng-show="errorMessage">
        {{ errorMessage }}
    </div>
  </form>
</div>