How to make a redirect from the main page to a specific page using .htaccess?

Question

htaccess

Previously, I implemented a redirect from the main domain to the site page.
Everything worked, but now it began to write that the redirection is cyclic.
Please tell me what is wrong and why the script stopped working?

Options +FollowSymLinks
RewriteEngine on
RewriteCond %{HTTP_HOST} ^site.ru
RewriteRule ^(.*)$ http://site.ru/campaign$1 [R=permanent,L]
RewriteCond %{HTTP_HOST} ^www.site.ru
RewriteRule ^(.*)$ http://site.ru/campaign$1 [R=permanent,L]

Answer 1

RewriteCond %{HTTP_HOST} ^site.ru$
RewriteCond %{REQUEST_URI} !^campaign.*/$
RewriteRule ^(.*)$ http://site.ru/campaign$1 [R=permanent,L]

Mde and you do not mind that the next time this rule {HTTP_HOST}
will be the same? and the rule will work again by adding another campaing to the existing line?