regex - HTTPS redirect for directory doesn't work correctly -

regex - HTTPS redirect for directory doesn't work correctly -

my goal forcefulness https on admin directory of site. however, using usual way give unusual result. here content of .htaccess:

rewriteengine on rewritecond %{server_port} 80 rewritecond %{request_uri} admin rewriterule ^(.*)$ https://www.domain.com/admin/$1 [r,l]

however, when seek open http://www.domain.com/admin/home.php, instead of redirecting https://www.domain.com/admin/home.php sends me https://www.domain.com/admin/admin/home.php.

so sort of creates admin/ part of url twice.

i tried changing lastly line of .htaccess rewriterule ^(.*)$ https://www.domain.com/$1 [r,l] (which doesn't create sense me, tried still) , redirected same wrong url, confused me further.

i'm not sure if should matter, i've tried replacing [r,l] [l,r=301] suggested elsewhere on so, no avail.

why happening , what's solution?

it due /admin/ in target url. alter rule this:

rewriteengine on rewritecond %{server_port} 80 rewriterule ^admin(/.*)?$ https://www.domain.com%{request_uri} [r,l,nc]

regex apache .htaccess mod-rewrite redirect