HTACCESS Rewrite to subdomain + rewrite url's - .htaccess

Question

I have a question about my HTACCESS. I've been experimenting with my HTACCESS for a while, and finally got the url rewriting to work - in combination with my own written php router.
I want to rewrite the url's not only to make them appear cleaner but also because i use it for the api. So i can do a GET/POST/PUT/DELETE to api/users and add a new user, update or remove etc.
Now i use these lines for the URL rewrite:
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule .*/api/(.*)$ api.php [QSA,L]
for the subdomain rerouting to a folder i use
RewriteCond %{HTTP_HOST} ^demo\.example\.com [NC]
RewriteRule (.*) http://example.com/demo/$1 [L,R=301]
The only problem now is that i can not seem to get these combined. I would like to have a url like:
demo.domain.com/api/user
If i use the two apart from each other they work like expected, but combined the url rewrite for the /api always fails. This is probably due to the rewrite condition of the subdomain, but i can't see how i can combine the two.

Answer 1

I found the solution, also i extended the htacces.. Here is my htaccess file:
# No Caching for page files
<filesMatch "\.(html|htm|js|css|php)$">
<IfModule mod_headers.c>
Header set Cache-Control "no-cache, no-store, must-revalidate"
Header set Pragma "no-cache"
Header set Expires 0
</IfModule>
</filesMatch>
# Error pages
ErrorDocument 404 https://%{HTTP_HOST}/#/404
ErrorDocument 500 https://%{HTTP_HOST}/#/500
RewriteEngine On
# Rewrite www to non
RewriteCond %{HTTP_HOST} !=""
RewriteCond %{HTTP_HOST} ^www\.(.*)$ [NC]
RewriteRule ^(.*)$ https://%1/$1 [R,L]
# Rewrite http to https
RewriteCond %{HTTPS} !=on
RewriteRule ^/?(.*) https://%{HTTP_HOST}%{REQUEST_URI} [R,L]
# Ignore conditions for files and folders
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteBase /
# Rewrite /api to api.php
RewriteRule ^api/(.+)$ api/api.php [QSA,L]
# Rewrite /downloads to downloads.php
# RewriteRule ^download/(.+)$ download/download.php [QSA,L]