RewriteCond %{THE_REQUEST} ^\S+\ /(([^?/]+/)*)(default|index|main)\.(htm|php) [NC]
RewriteCond %1 !^administrator/
RewriteRule ^ https://site.ru/%1 [L,R=301,NE]
!
- отрицаниеRewriteCond %{THE_REQUEST} ^[A-Z]{3,9}\ /([^/]+/)*(default|index|main)\.(html|php|htm)\ HTTP/ [NC]
RewriteCond %{THE_REQUEST} !^тут ваша страничка/% [NC]
RewriteRule ^(([^/]+/)*)(default|main|index)\.(html|php|htm)$ https://site.ru/$1 [L,R=301]