protected function _checkPcrePattern($pattern = null) {
		if (empty($pattern)) {
			return null;
		}

		$result = true;
		try {
			//@codingStandardsIgnoreStart
			$matchResult = @preg_match($pattern, 'some text');
			//@codingStandardsIgnoreEnd
			if ($matchResult === false) {
				$result = false;
			}
		} catch (Exception $exception) {
			$result = false;
		}

		return $result;
	}