custom validation on custom fields?

Alex Hall <[email protected]>
Newsgroups gmane.comp.bug-tracking.request-tracker.user
Message-ID <CA+Q8_Je9_rLVpNLYj4iZ=VqP2OJ8KBMBNRH1BbV_6MsGvj==cQ@mail.gmail.com>
Hi all,
I've looked through the wiki and the docs, plus on Google, but can't find
anything about customizing validation. We have two custom fields which may
be empty or not, but if they have a value, it has to be of the right
format. Both are single-line text fields. How would I set up RT so that I
can apply a regular expression, or some other kind of formatting, to these
fields? Thanks in advance.

-- 
Alex Hall
Automatic Distributors, IT department
[email protected]

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