mod-rewrite when index.php is in the URL - regex

Question

I wish to rewrite http://example.com/admin/pages/index.php to http://example.com/index.php?admin=admin&cid=pages.
It works for http://example.com/admin/pages (which I also want), but not for http://example.com/admin/pages/index.php.
How is this accomplished?
RewriteEngine On
RewriteBase /
# If the request is for a valid directory, file, or link, don't do anything
RewriteCond %{REQUEST_FILENAME} -d [OR]
RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -l
RewriteRule ^ - [L]
#remove the trailing slash
RewriteRule (.+)/$ $1
# If you add this first rule to support views, be sure to remove the QSA flag from the second rule (maybe not required since the first rule has the L flag)
#replace admin/cid with index.php?admin=admin&cid=cid
RewriteRule ^([^/]+)/([^/]+)/?$ index.php?admin=$1&cid=$2 [L,QSA]
#replace mypage with index.php?admin=mypage
RewriteRule ^([^/]+)/?$ index.php?admin=$1 [L,QSA]
EDIT
Random changes shows that this might be correct.
RewriteRule ^([^/]+)/([^/]+)/index.php/?$ index.php?admin=$1&cid=$2 [L,QSA]
RewriteRule ^([^/]+)/([^/]+)/?$ index.php?admin=$1&cid=$2 [L,QSA]
#replace mypage with index.php?admin=mypage
RewriteRule ^([^/]+)/index.php/?$ index.php?admin=$1 [L,QSA]
RewriteRule ^([^/]+)/?$ index.php?admin=$1 [L,QSA]

Answer 1

Problem is your first rule that is skipping all files & directories from rules.
Replace your rules with this:
RewriteEngine On
RewriteRule ^index\.php$ - [L,NC]
#remove the trailing slash
RewriteRule (.+)/$ $1 [L,R=302]
# If you add this first rule to support views, be sure to remove the QSA flag from the second rule (maybe not required since the first rule has the L flag)
#replace admin/cid with index.php?admin=admin&cid=cid
RewriteRule ^([^/]+)/([^/]+)(?:/?|/index\.php)$ index.php?admin=$1&cid=$2 [L,QSA]
#replace mypage with index.php?admin=mypage
RewriteRule ^([^/.]+)/?$ index.php?admin=$1 [L,QSA]