URL重写–第一个值不起作用

Question

I'm trying to create friendly URLs using:

Options +Indexes
Options +FollowSymLinks 
Options -MultiViews

<IfModule mod_rewrite.c>
    RewriteEngine on
    RewriteBase /
    RewriteCond %{REQUEST_FILENAME} !-d 
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteRule ^([^/]*)/([^/]*)/([^/]*)/?$ /index.php?lang=$1&page=$2&subpage=$3 [L,QSA]
</IfModule>

Everything works normally when I try:

www.mydomain.com/en/my-page/

OR

www.mydomain.com/en/my-page/my-subpage/

However, I get 404 error when I try this:

www.mydomain.com/en/

I've been trying understand the problem. Thanks in advance.

–Edit–

Anubhava's solution works very well. In addition to that, here is another solution if you need optional parameters.

Options +Indexes
Options +FollowSymLinks 
Options -MultiViews

<IfModule mod_rewrite.c>
    RewriteEngine on
    RewriteBase /
    RewriteCond %{REQUEST_FILENAME} !-d 
    RewriteCond %{REQUEST_FILENAME} !-f

    RewriteCond %{REQUEST_URI}  ^/([^/]+)/?([^/]*)?/?([^/]*)?/?([^/]*)?/?   [NC]
    RewriteRule .*    index.php?lang=%1&page=%2&subpage=%3&anotherkey=%4  [L]
</IfModule>

Answer 1

Have it like this:

Options +Indexes
Options +FollowSymLinks 
Options -MultiViews

<IfModule mod_rewrite.c>
    RewriteEngine on
    RewriteBase /
    RewriteCond %{REQUEST_FILENAME} -d [OR]
    RewriteCond %{REQUEST_FILENAME} -f
    RewriteRule ^ - [L]

    RewriteRule ^([^/]+)/([^/]+)/([^/]+)/?$ /index.php?lang=$1&page=$2&subpage=$3 [L,QSA]
    RewriteRule ^([^/]+)/([^/]+)/?$ /index.php?lang=$1&page=$2 [L,QSA]
    RewriteRule ^([^/]+)/?$ /index.php?lang=$1 [L,QSA]
</IfModule>