.htaccess - how make rules apply to both specific pages and directories

I got help from this site to get functioning code for .htaccess:

# force https for /login.php and /register.php
RewriteCond %{HTTPS} off
RewriteRule ^(login|register)\.php$ https://%{HTTP_HOST}%{REQUEST_URI} [R=301,L]

# don't do anything for images/css/js (leave protocol as is)
RewriteRule \.(gif|jpe?g|png|css|js)$ - [NC,L]

# force http for all other URLs
RewriteCond %{HTTPS} on
RewriteCond %{SCRIPT_FILENAME} !(login|register)\.php$
RewriteRule .* http://%{HTTP_HOST}%{REQUEST_URI} [R=301,L]

But now I realize I also need to add a couple of directories to these rules. How can this be done?

Why doesn't the following work:

# force https
RewriteCond %{HTTPS} off
RewriteCond %{SCRIPT_FILENAME} ^(securimage|ADM)/(.*)$
RewriteCond %{SCRIPT_FILENAME} ^(login|register)\.php$
RewriteRule .* https://%{HTTP_HOST}%{REQUEST_URI} [R=301,L]

# don't do anything for images/css/js (leave protocol as is)
RewriteRule \.(gif|jpe?g|png|css|js)$ - [NC,L]

# force http for 开发者_运维问答all other URLs
RewriteCond %{HTTPS} on
RewriteCond %{SCRIPT_FILENAME} !(securimage|ADM)/(.*)$
RewriteCond %{SCRIPT_FILENAME} !(login|register)\.php$
RewriteRule .* http://%{HTTP_HOST}%{REQUEST_URI} [R=301,L]

I've tried a few different variances, nothing's working. :(

I solved it by putting separate .htaccess files in the directories I wanted to secure, containing:

RewriteEngine On
RewriteCond %{HTTPS} off
RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI}