Cron\Schedule\CrontabSchedule::parsePattern PHP 메소드

    protected function parsePattern($pattern)
    {
        $parts = ['min' => '[0-5]?\\d', 'hour' => '[01]?\\d|2[0-3]', 'day' => '0?[1-9]|[12]\\d|3[01]', 'month' => '[1-9]|1[012]', 'dow' => '[0-6]', 'year' => '20([0-9]{2})'];
        $regex = [];
        foreach (array_slice($parts, 0, 5) as $name => $number) {
            $range = '(' . $number . ')(-(' . $number . '))?';
            $regex[$name] = '(?P<' . $name . '>(\\*(\\/\\d+)?|' . $range . '(,' . $range . ')*))';
        }
        $range = '(' . $parts['year'] . ')(-(' . $parts['year'] . '))?';
        $regexYear = '( (?P<year>(\\*(\\/\\d+)?|' . $range . '(,' . $range . ')*)))?';
        $regex = '/^' . implode('([\\s\\t]+)', $regex) . $regexYear . '$/';
        preg_match($regex, $pattern, $matches);
        return array_intersect_key($matches, $parts);
    }