Validating Crontab Entries with PHP

Question

What is the best way to validate a crontab entry with PHP? Should I be using a regex, or an external library? I\'ve got a PHP script that adds/removes entries from a crontab

Answer 1

You should be able to do that fairly easily with regex. In fact, I wouldn't be surprised if you could find an existing regex for just that on Google. This is untested, but perhaps something like:

/^((\*)|(\d+((-\d+)|(,\d+)+))\s+){5}/