Simpler Python Regex object to validate crontab entry time format string.

validate_crontab_time_format_simple.py

validate_crontab_time_format_regex = re.compile(\
    r"^{0}\s+{1}\s+{2}\s+{3}\s+{4}$".format(\
        r"(?P<minute>[\d\*]{1,2}([\,\-\/][\d\*]{1,2})*)",\
        r"(?P<hour>[\d\*]{1,2}([\,\-\/][\d\*]{1,2})*)",\
        r"(?P<day>[\d\*]{1,2}([\,\-\/][\d\*]{1,2})*)",\
        r"(?P<month>[\d\*]{1,2}([\,\-\/][\d\*]{1,2})*)",\
        r"(?P<day_of_week>[0-6\*]([\,\-\/][0-6\*])*)"
    ) # end of str.format()
) # end of re.compile()

Hello they are a probleme for example if the crontab are:
0 7 * * 1,2,3,4,5,8
(validate_crontab_time_format_regex.match("0 7 * * 1,2,3,4,5,8").groupdict())

result:
{'minute': '0', 'hour': '7', 'day': '', 'month': '', 'day_of_week': '1'}