No any role assign the the new user with matched regex according to role assignment rule.
Steps to reproduce:
Login to zanata as admin.
Click on admin from left menu panel.
Click on Role Assignment Rules.
Create new role.
Select policy name : internal
Enter regex e.g test*
Select role which you wants to assign. e.g project-creator.
Logout from admin.
Click on signup
Signup with user name which will match test*
Activate your account.
Login to new signup user.
Observe the account access.
Login as admin.
Go to admin ->manage users.
Search for new signed up user.
Click on user.
Observe the user details.
Auto role assignment is not working.
Auto role assignment rule should work.
Attached screen captured for more ref.