CIBlockSectionPropertyLink::cleanFilterHint

static function cleanFilterHint(?string $filterHint): ?string
{
	if ($filterHint === null)
	{
		return null;
	}
	$cleanHint = trim($filterHint);
	if ($cleanHint === '')
	{
		return '';
	}
	$TextParser = null;
	if (!$TextParser)
	{
		$TextParser = new CBXSanitizer();
		$TextParser->SetLevel(CBXSanitizer::SECURE_LEVEL_LOW);
		$TextParser->ApplyDoubleEncode(false);
	}

	$cleanHint = $TextParser->SanitizeHtml($cleanHint);
	if (preg_match('/^(
)+$/', $cleanHint))
	{
		$cleanHint = '';
	}

	return $cleanHint;
}