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Wildcards do not work with this feature (nor with the same feature now part of Joomla 4 itself). These features match the entire domain name part of an email address.

There is no way to block an entire top-level domain such as .ru, .com and so on from registering a user account.

You can block the most common Russian domain names with the same effect as what you seem to be trying to do:

• mail.ru
• yang.ru
• list.ru
• bk.ru
• rambler.ru
• inbox.ru
• ya.ru

If you're worried about spam registrations, please remember that there is already a feature to automatically delete user accounts which have failed to verify their email address after a certain number of days.

Components, Admin Tools for Joomla, Control Panel.

Click on "Site maintenance scheduling (via plugin)"

There you can find the “Delete inactive users” setting.

I'd recommend setting it to “Activated or not, as long as the haven't logged in” and then set the “Delete after this many days” to something that makes sense in your use case (I'd start high, e.g. 30).

Why not use “Only if they haven't activated their account”? Because this might happen to legitimate user accounts when they ask for a password reset, the password reset email ends up in spam, and they don't notice it until their user account is deleted.

You're welcome!

Have a great day :)