One user-agent string per line (or its part). This file must be UTF-8-encoded and use Unix-style line endings (LF). Blank lines are allowed but there are no comment lines (even this one isn't).

Googlebot
Google Web Preview

YandexBot
YandexMetrika
YandexImages
YandexDirect

bingbot
Yahoo! Slurp
Mail.Ru
Baiduspider
Sogou web spider
Purebot
MJ12bot
SiteBot
LexxeBot
discobot
Ezooms