Antispam system with query

[elenh]

Good morning.
I see on a greek forum a system for post to type only with greek character.
I the user types more than x number of latin characters then the system let him not to post the messae and its works with querys so far as o know.

Is it possible to make the same for spam?
I.e if a member types a message like this latin format: dfsdfjhjsdfkljdfgdfg or 3333333333333
then the system make querys and if it is i.e. more or least 3 d - 3 f - 3 t in the same word and the total charachters are 12 then find that as spam and let him not to post the message.

With the same method can search for old spam message the admins on admin cp.

Can somebody do that?

Thank you.