What version are you running?
RC 1

What's the URL of the page containing the problem?
https://reviewboard/admin/db/reviews/reviewrequest/<ID>/

What steps will reproduce the problem?
1. From the general user ReviewRequest View/Edit screen set the bugs field
to "55555-55". 
2. Now go to the Admin edit page, change a field (any field) and select Save.
3. You will get an error that the bugs field is invalid. It does not appear
to allow the "-" in the bugs field. You can however have a "-" from the
general user ReviewRequest View/Edit screen.

NOTE: We NEED "-" support, please don't remove that. Just fix the
validation on the bugs field to be more relaxed.