How to rewrite URL for user profile in .htaccess

My user profile URL 开发者_Python百科looks like this: http://mysite.com/profile.php?user=Rango and I want to make it like: http://mysite.com/Rango

Maybe somebody can help with an example? Thank you very much.

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RewriteEngine On

RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.*)$ /profile.php?user=$1 [L,QSA]