public function validate(\Nethgui\Controller\ValidationReportInterface $report)
{
$request = $this->getRequest();
// restrict custom profile name to a common "variable name" grammar:
if ($request->isMutation() && $this->parameters['profileName'] === 'custom') {
$this->getValidator('customValue')->regexp('/^[a-z][a-z0-9]+$/i');
}
parent::validate($report);
}