New Gmail or GDrive Instance (Auto Discover)
Use this dialog box to auto discover user accounts.
Enable Auto Discover
Select this check box to enable auto discovery of user accounts.
Match User Name by regular expressions
Select this option to discover the user accounts that match the regular expressions that you provide while auto discovery of user accounts.
Google User Group Affinity
Select this option to discover the user accounts that are part of a sub organization created on Google.