Apache rewrite rule for specific subdomain and file types

Hi lads,

I’m in need of some help with a tricky Apache rewrite situation I’m facing. I have multiple subdomains and subdirectories with various access requirements, and I want to create a rewrite rule that satisfies a couple of conditions.

Basically, if :

• the request comes from the subdomain subdomain.example.com
• the requested URL path starts with /files/.
• the file extension is .pdf or .jpg.
• the filename starts with a public_ prefix.

If all the above conditions are met, the request should be redirected to a separate domain https://public-files.example.net/.

I’ve tried the following rewrite rule:

RewriteEngine On
RewriteCond %{HTTP_HOST} ^subdomain\.example\.com$
RewriteCond %{REQUEST_URI} ^/files/public_.*\.(pdf|jpg)$
RewriteRule ^/files/public_(.*)\.(pdf|jpg)$ https://public-files.example.net/$1.$2 [R=301,L]

ofcourse with my domains but it doesn’t work. I believe it might be conflicting with other rewrite rules in my configuration.