Currently all users are displayed for adding users to delegated group and need validation for group so that only specific domain users can be added to group.
Please find below sample use case:
We have 2 classes of users - internal and public. Internal users are registered by their username, public users are registered via their email address.
We would like the option of being able to prevent public addresses being entered into groups intended to be populated with internal users.
One example solution would be to have a controlling RegExp associated with a group that has to be matched before a delegated user gets their name entered into a group. No regexp = anything goes. RegExp = must match before a user can be added to the group.