On a daily basis I receive huge amounts of spam via a contact form. The content of these spam emails is very similar like this example:

```
Ïîñëåäíèè íîâîñòè àðìåíèè ÷èòàéòå íà ñàéòå somedomainname.com

```

For this specific kind of spam I would like to add PHP detection of 3 consecutive special characters because it would never occur in a legitimate email (at least it hasn't in the last 10 years). What would be a smart way to accomplish this?

edit: I'm not sure how I should classify these characters. They all have some kind of accent as shown in the example.