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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