Neos\Flow\Aop\Pointcut\PointcutExpressionParser::getVisibilityFromSignaturePattern PHP Method

    protected function getVisibilityFromSignaturePattern(&$signaturePattern)
    {
        $visibility = null;
        $matches = [];
        $numberOfMatches = preg_match_all(self::PATTERN_MATCHVISIBILITYMODIFIER, $signaturePattern, $matches, PREG_SET_ORDER);
        if ($numberOfMatches > 1) {
            throw new InvalidPointcutExpressionException('Syntax error: method name expected after visibility modifier in "' . $signaturePattern . '", defined in ' . $this->sourceHint, 1172492754);
        }
        if ($numberOfMatches === false) {
            throw new InvalidPointcutExpressionException('Error while matching visibility modifier in "' . $signaturePattern . '", defined in ' . $this->sourceHint, 1172492967);
        }
        if ($numberOfMatches === 1) {
            $visibility = $matches[0][1];
            $signaturePattern = trim(substr($signaturePattern, strlen($visibility)));
        }
        return $visibility;
    }