Additional methods for conditional user entry

[rinseaid]

It would be great to have additional capabilities around the showForUserIDs function.

For instance, the ability to match on any user ID containing specific strings (e.g. filter for any username starting with 'admin_') - this would be helpful in environments where users have separate accounts for administrative access. Ideally just a regex match.

It would also be great if this could be based on a role or other attribute from SSO.