Where can I find the rules for negative keywords?

Question

Yandex.Direct

Hello. As I noticed in the direct, there are certain rules for minus words, for example, you can’t add a minus word "8.8.8" gives an error "Negative phrases can contain no more than two digits in a row through a dot. Errors in phrases: 8.8.8" where you can find out all these rules?

Answer 1

In addition to the main article, there are no materials in the help of Yandex.Direct. Separate detailed restrictions can only be learned from your own practice or you can try asking your account manager. From myself I can say that they are singular.