Auto ban according to custom field

[Jurg]

Hi all,

A fairly simple request/idea here. I currently have a custom profile field for my users that is required for registration, which is a standard text line field. I have noticed that when 99% of spam bots sign up they populate that field with the text "array". Would it be possible to automatically ban any user who enters the text "array" in that registration field? This would cut out virtually all of the manual banning my moderation team and I do, and due to the nature of the question asked would be very very unlikely to ban any genuine users inadvertently typing array into the field.

Please also let me know if there is a simple way to do this through the existing admincp. I've had a look but avenues such as the promotion system do not seem to work with custom fields.

Any help much appreciated.

(Using VB 3.8.x)