Problem with .htaccess RewriteRules

I have this .htaccess RewriteRules, that doesn't work.

RewriteRule ^(.+)\/(.+)\/$ /index.php?pg=$1&act=$2

What this code should do, is transofrm /somthing/other/ into /index.php?pg=somthing&act=other.

Making some test, I discovered that also the pg var is not passed.

I have another line like this, RewriteRule ^(.+)\/$ /index.php?pg=$1 an it work! So, I don't know why the first one didn't work!!

If you don't need to use any other characters than a-z and 0-9 I recommend you to use this:

RewriteRule ^([a-z0-9-]+)/([a-z0-9-]+)$ /index.php?pg=$1&act=$2

It should work.