Im really really a newbie in regexp and i cant figure out how to do that.

My goal is to have the RewriteRule to 'slice' the request url in 3 parts:

example.com/foo
#should return: index.php?a=foo&b=&c=

example.com/foo/bar
#should return: index.php?a=foo&b=bar&c=

example.com/foo/bar/baz
#should return: index.php?a=foo&b=bar&c=baz

example.com/foo/bar/baz/bee
#should return: index.php?a=foo&b=bar&c=baz/bee

example.com/foo/bar/baz/bee/apple
#should return: index.php?a=foo&b=bar&c=baz/bee/apple

example.com/foo/bar/baz/bee/apple/and/whatever/else/no/limit/in/those/extra/parameters
#should return: index.php?a=foo&b=bar&c=baz/bee/apple/and/whatever/else/no/limit/in/those/extra/parameters

In short, the first parameter in the url (foo) should be given to a, the second (bar) to b, and the rest of the string in c

I wroted this one

<IfModule mod_rewrite.c>
  RewriteEngine on
  RewriteCond %{REQUEST_FILENAME} !-f
  RewriteCond %{REQUEST_FILENAME} !-d
  RewriteCond %{REQUEST_URI} !=/favicon.ico
  RewriteRule ^(([a-z0-9/]))?(([a-z0-9/]+))?(([a-z0-9]+))(.*)$ index.php?a=$1&b=$2&c=$3 [L,QSA]
</IfModule>

but obviously doesnt work, and i dont even know if what i want is possible.

Any suggestion?