Why doesn't rewrite rule work in my htaccess?

Question

linux

I have a link:

ipaddr/opensys/base/

Or others similar:

ipaddr/opensys/base/something.php?olol=yep

I want to replace "opensys" and display "center" instead, i.e. convert links to:

ipaddr/center/base/
ipaddr/center/base/something.php?olol=yep

Initially, I just made a symlink on the server, but some plugins in this system did not start with this symlink, the system is complex and it is not possible to debug it. Therefore, I decided to do it through mod rewrite.
My htaccess:

RewriteEngine on
RewriteRule ^/opensys/base/(.*)$ /center/base/$1 [L]
RedirectMatch 301  ^/opensys/base/(.*)$ /center/base/$1

The redirect works fine, but new links get 404, i.e. rewriteRule not working, why?

Answer 1

Most likely the 2nd line should be

RewriteRule ^opensys/base/(.*)$ /center/base/$1 [L]

In general, there are a lot of online .htaccess testers