How do i stop users (bots) registering with numeric only usernames?
 

Hi, i have put all the things in place to prevent bot registration, except ASKIMET, i still get organic bot registrations but they tend to register with some software that is using numerics to register i.e all the registartion questions are answered with a 1 or the first thing on any of the dropdown lists is chosen, when it comes to their username they register with a random number ie. 00342516 is there any way to prevent a registration with just numbers? i would like to say prevent all registrations that have numbers but i already have many users that have numerics in their username so it wouldnt be fair to deny them.

Can anyone help?