[rt-users] Custom field format validation without being mandatory

[Edward Frye]

>
> How can I setup a custom field validation and have if so that it can be
> blank, OR match my regular expression
>
> Currently I have: (?#YYYY-MM-DD HH:mm:ss)^[12]\d{3}-\d{2}-\d{2}
> \d{2}:\d{2}:\d{2}$
>
> Really what I guess what I think I'm looking for is
> /(^[12]\d{3}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}$|^$)/
>
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