need to re-write a specific link with mod-rewrite - .htaccess

Question

/support-category/?category=category name
to:
/support/category/category name
This does not appear to be working:
RewriteRule ^support/category/$4 support-category/?category=$4 [nc]
Thank you :)
Also if I am getting the category name with a get request will that work when the link is accessed via the /support/category/category name format?
here's the entire .hatacces folder and it is located in the root directory of the site.
AuthName "Restricted Area"
AuthType Basic
AuthUserFile "/var/www/vhosts/xxx.de/dev.xxx.de/.htpasswd"
Require valid-user
# BEGIN W3TC Browser Cache
<IfModule mod_deflate.c>
<IfModule mod_headers.c>
Header append Vary User-Agent env=!dont-vary
</IfModule>
AddOutputFilterByType DEFLATE text/css text/x-component application/x-javascript application/javascript text/javascript text/x-js text/html text/richtext image/svg+xml text/plain text/xsd text/xsl text/xml image/x-icon application/json
<IfModule mod_mime.c>
# DEFLATE by extension
AddOutputFilter DEFLATE js css htm html xml
</IfModule>
</IfModule>
# END W3TC Browser Cache
# BEGIN W3TC CDN
<FilesMatch "\.(ttf|ttc|otf|eot|woff|font.css)$">
<IfModule mod_headers.c>
Header set Access-Control-Allow-Origin "*"
</IfModule>
</FilesMatch>
# END W3TC CDN
# BEGIN W3TC Page Cache core
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{HTTP:Accept-Encoding} gzip
RewriteRule .* - [E=W3TC_ENC:_gzip]
RewriteCond %{HTTP_COOKIE} w3tc_preview [NC]
RewriteRule .* - [E=W3TC_PREVIEW:_preview]
RewriteCond %{REQUEST_METHOD} !=POST
RewriteCond %{QUERY_STRING} =""
RewriteCond %{REQUEST_URI} \/$
RewriteCond %{HTTP_COOKIE} !(comment_author|wp\-postpass|w3tc_logged_out|wordpress_logged_in|wptouch_switch_toggle) [NC]
RewriteCond "%{DOCUMENT_ROOT}/wp-content/cache/page_enhanced/%{HTTP_HOST}/%{REQUEST_URI}/_index%{ENV:W3TC_PREVIEW}.html%{ENV:W3TC_ENC}" -f
RewriteRule .* "/wp-content/cache/page_enhanced/%{HTTP_HOST}/%{REQUEST_URI}/_index%{ENV:W3TC_PREVIEW}.html%{ENV:W3TC_ENC}" [L]
</IfModule>
# END W3TC Page Cache core
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
RewriteRule ^support/category/([^/]+)$ support-category/?category=$1 [L,QSA,NC]
</IfModule>
# END WordPress
added this to functions.php
function rewrite_support() {
$wp_rewrite->flush_rules();
add_rewrite_rule('^support/category/([^/]+)/?$','support-category/?category=$matches[1]','top');
}
add_action( 'init', 'rewrite_support');
thanks

Answer 1

You can use:
RewriteEngine On
RewriteRule ^support/category/([^/]+)$ support-category/?category=$1 [L,QSA,NC]