How to set up an internal redirect in htaccess?

Question

Apache HTTP Server

Internal redirect not working.
HTACCESS itself:
RewriteEngine on
RewriteCond %{REQUEST_URI} (.*).(jpg|png|jpeg|gif)$ [NC]
RewriteRule ^(.*)$ www.site.com/img.gif [L]
Upon request, any pictures on my site should be replaced with a picture of another site.
Everything used to work before moving to another host. I remember that there was already such a problem, and it was solved by prescribing some settings in Apache. There is access to *.conf. Please help.

Answer 1

you have an error in the regular expression, moreover, a critical one,
for example, the page /megagif will be
considered a file
. .(jpg|png|jpeg|gif)$ [NC]