Bot redirect via htaccess?

Question

htaccess

How can I block all bots except Yandex and Google?
Or send to a separate page.

Answer 1

In a nutshell, see below for more details.
To prevent crawlers from crawling, robots.txt is usually used,

like this

User-agent: Googlebot
Allow: /

User-agent: Yandex
Allow: /

User-agent: *
Disallow: /

Detailed lists of user agents: google and yandex .
But robots.txt is just a warning, so some SEO bots will simply ignore it.
Now about .htaccess: when processing requests, the web server can only focus on what is sent to it in the headers. Any bot can send anything to the User-agent, so it will not be possible to distinguish them from a regular user.
Yes, there are projects like this one that update the bases for defining "bad bots". If that's what you really need, check it out.