I don't understand why but when I use this:
#RewriteRule ^/?r/(.*)$ /index.php?n=$1 [L]
to rewrite mysite.com/r/somewhat to mysite.com/index.php?r=somewhat the site work.
But if I use this:
#RewriteRule ^/?(.*)$ /index.php?name=$1 [L]
to rewrite mysite.com/somewhat to mysite.com/index.php?r=somewhat, my site stop working.
I don't understand why. Someone can help me?
How can I rewrite mysite.com/somewhat to mysite.com/index.php?r=somewhat?
Your 2nd rule will cause infinite looping since target URI /index.php?r=somewhat also matches .*. Eventually it causes 500 internal server error.
To fix you need to avoid rewriting files and directories using RewriteCond like this:
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^/?(.+)$ /index.php?r=$1 [L,QSA]