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

[Kevin Falcone]

On Wed, Jul 27, 2011 at 11:59:44AM -0700, Edward Frye wrote:
>      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}$|^$)/

perldoc perlre will tell you more than you ever wanted to know, but
something like:
/^(?:foo|)$/ or /^foo$|^$/
is what you want to emulate.

Remember that the (?#YYYY-MM...) part needs to be self contained since
it isn't an active part of the regex.

-kevin
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