DMS\Filter\Filters\Alnum::apply PHP Method

    public function apply(Rule $rule, $value)
    {
        //Check for Whitespace support
        $whitespaceChar = $rule->allowWhitespace ? " " : "";
        $rule->unicodePattern = '/[^\\p{L}\\p{N}' . $whitespaceChar . ']/u';
        $rule->pattern = '/[^a-zA-Z0-9' . $whitespaceChar . ']/';
        return parent::apply($rule, $value);
    }