.link TLD is not accepted in user XMPP settings

[zfkdnop]

With "Allow user to overwrite XMPP settings" ENABLED:

When I go to my user settings, Settings -> Personal -> JavaScript Xmpp Client, I am presented with the text, "If you like to use your XMPP account with a different client, use [email protected] as your Jabber ID (JID)."

When I enter "[email protected]" into the field labelled "Username" and click Save XMPP Settings I am presented with the error message, "Please match the requested format."
When I change the Username field contents to "[email protected]" and click Save XMPP Settings, the settings are saved (no error message)

This leads me to believe the .link TLD is NOT recognized as valid. Please add this to your regex.