I dynamic number of Joomla installations in subfolders of the domain.

For example:

    http://site/joomla_1/
    http://site/joomla_2/
    http://site/joomla_3/
    ...

Currently I have the follwing config that works:

index index.php;

location / {
    index index.php index.html index.htm;
}

location /joomla_1/ {
    try_files $uri $uri/ /joomla_1/index.php?q=$uri&$args;
}

location /joomla_2/ {
    try_files $uri $uri/ /joomla_2/index.php?q=$uri&$args;
}

location ~ \.php$ {
    fastcgi_pass unix:/var/run/php5-fpm/joomla.sock;
    ...
}

I'm trying to combine joomla_N rules in one:

location ~ ^/(joomla_[^/]+)/ {
    try_files $uri $uri/ /$1/index.php?q=$uri&$args;
}

but server starts to return index.php as is (does not call the php-fpm).

It looks like the nginx stops the processing of the regex rules after the first match.

Is there any way to combine this rules with something like regex?