Cron validator is not correct

[HoangViet144]

• I have looked at the documentation here first?
• I have looked at the examples provided that may showcase my question here?

Package version eg. v9, v10:

v10.14.0

Issue, Question or Enhancement:

Cron validator seems not correct. It throws error on input "0 */1 * * *" or "0 */2 * * *"

[yazver]

0 0 */2 * * don't work too.