.htaccess help please

I’m trying to make it so the following link:

[url]http://www.somesite.com?city=somecity[/url]

will be instead re-written to:

[url]http://www.somesite.com/somecity[/url]

The existing .htaccess file I have is below. This strips out the .php extension and resolves the http/www URL issue. This works fine.

[B][U]Existing[/U][/B]

Options +FollowSymLinks -MultiViews
RewriteEngine on
RewriteCond %{HTTP_HOST} ^{^somesite.com}
RewriteRule (.*) http://www.somesite.com/$1 [R=301,L]
RewriteCond %{THE_REQUEST} ^{^[A-Z]{3,9}} /index.php HTTP/
RewriteRule ^{^index.php$} [url]http://www.somesite.com/[/url] [R=301,L]

RewriteBase /
RewriteCond %{THE_REQUEST} ^{^[A-Z]{3,}s([^.]+).php} [NC]
RewriteRule ^ %1 [R,L,NC]

RewriteCond %{REQUEST_FILENAME}.php -f
RewriteRule ^ %{REQUEST_URI}.php [L]

And this is what I’m adding at the end but it does absolutely nothing:

[U][B]Addition[/B][/U]

RewriteRule ^{^/city/([0-9]+)} /www.somesite.com/city=$1

Does anyone have any thoughts as to why this isn’t working?

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