cron表达式 正则英语
    ## Cron Expressions in English.
    Cron expressions are used to define schedules for tasks in the Unix-like operating systems. They are comprised of six fields, each of which represents a different unit of time. The fields are:
    Minute.
    Hour.
    Day of month.
    Month.
    Day of week.
    Year (optional)。
    Each field can be specified using a variety of values, including:
    Asterisk (``): Matches any value in the field. For example, `` in the minute field matches every minute.
    Number: Matches the specified value in the field. For example, `10` in the hour field matches 10:00 AM.
    Range: Matches any value within the specified range. For example, `1-10` in the minute field matches every minute from 1:00 AM to 10:00 AM.
    List: Matches any value in the specified list. For example, `1,3,5` in the day of month field matches the 1st, 3rd, and 5th day of the month.
    Step: Matches every nth value in the field. For example, `/2` in the minute field matches every other minute.
    In addition to these basic values, cron expressions also support a number of special characters:
    Comma (`,`): Separates multiple values in a field.
    Dash (`-`): Specifies a range of values in a field.
    Slash (`/`): Specifies a step value in a field.
    Question mark (`?`): Matches any value in a field, but only if the previous field is also matched.
    For example, the following cron expression matches every minute of every hour on the 1st and 15th day of every month:
    0  1,15。
    The following cron expression matches every minute of every hour on weekdays:
    0    1-5。
    The following cron expression matches every minute of every hour on the first day of every month:
    0  1。
    Cron expressions can be used to schedule tasks with a variety of different frequencies. They are a powerful tool for automating tasks and ensuring that they are run at the desired time.
    ## Examples of Cron Expressions.
    Here are some examples of cron expressions and their corresponding schedules:
    `    `: Every minute.
    `0    `: Every hour.
正则化英文    `0 0  `: Every day at midnight.
    `0 0 1  `: Every day at 1:00 AM.
    `0 0 1  `: Every day at 1:00 AM.
    `0 0  1-5`: Every day at midnight on weekdays.
    `0 0  6,0`: Every day at midnight on Saturday and Sunday.
    `0 0 1 1 `: The first day of every month at 1:00 AM.
    `0 0 15 1 `: The 15th day of every month at 1:00 AM.
    `0 0  1-5`: Every day at midnight on weekdays.
    `0 0 17  `: Every day at 5:00 PM.
    `0 0 17  `: Every day at 5:00 PM.

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