Multiple rewrite conditions and folder exception in .htaccess file - regex

Question

I'm working on my website and facing some problems with .htaccess files.
I got a main directory(in my case public_html) with sub directory called admin.
What I'm trying to manage is that if end-user enters URL like example.com/admin, he will be redirected to that admin directory which contains login form, custom index.php file and so on.
If other url has been entered, it needs to be checked by some conditions.
Here are my .htaccess files:
For main directory:
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-l
RewriteRule ^([^/]+)/([^/]+)/([^/]+)$ index.php?menu=$1&op=$2&id=$3 [QSA,L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-l
RewriteRule ^([^/]+)/([^/]+)$ index.php?menu=$1&op=$2 [QSA,L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-l
RewriteRule ^([^/]+)$ index.php?menu=$1 [QSA,L]
For admin directory:
RewriteEngine off
Right now main directories .htaccess file works properly after entering urls like:
example.com/news/article/4
example.com/news/list
example.com/home
but if I enter example.com/admin, its associated with third rewrite rule and thinks that 'admin' is a menu link.
I have tried different exceptions, but nothing worked for me, admin is still associated with menu not directory. Maybe my main .htaccess file has some mistakes? Could some one suggest me the right solution for this issue?

Answer 1

You don't need any .htaccess in admin directory. Just have these rules in root .htaccess:
DirectorySlash On
DirectoryIndex index.php
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule ^([^/]+)/([^/]+)/([^/]+)/?$ index.php?menu=$1&op=$2&id=$3 [QSA,L]
RewriteRule ^([^/]+)/([^/]+)/?$ index.php?menu=$1&op=$2 [QSA,L]
RewriteRule ^([^/]+)/?$ index.php?menu=$1 [QSA,L]