javan/whenever — pull request #504 by dannyfallon (2014-11-15 19:24:38+00:00)
Title: Tighten up the cron regex

The old regex would allow cron-style strings such as '* * * * * * * *', which is
invalid. While it's very difficult, if not impossible, to regex a cron-style string
this should be a significant improvement.

It allows exactly 5 occurances of: any integer, comma, forward-slash or dash more than
once OR a single *.