The "0 0 0 ? * Mon/2" is an invalid cron string with quartz 3.0.1

[guotuofeng]

Quartz.net 3.0.1

Expected behavior

The "0 0 0 ? * Mon/2" should be a valid cron string which should be triggered every two weeks on Monday.

In Quartz 2.5, it works fine.

Actual behavior

The exception is thrown

System.FormatException: 'Illegal characters for this position: 'MON''

Steps to reproduce

            var cron_expr = "0 0 0 ? * Mon/2";
            CronExpression.IsValidExpression(cron_expr); // should be true, but return false

[lahma]

I believe this did parse as valid in 2.x but did never obey the every second week rule. This is why the validation now throws error as it's not supported.

[toolgood]

This error also exists in 3.06.

[lahma]

I believe this was fixed with #790 and already part of 3.1 beta 1.