Htaccess RewriteRule

Здравствуйте,

Может кто то поможет мне решить задачу. Как я могу сделать с помощью htaccess файла

при нажатии на этот ссылку

site.ru/index.php?a=popular_music

открывался вот эта ссылка

site.ru/explore/filter/popular%20music

с уважением,

Пример майого htaccess файла

RewriteEngine on

RewriteCond %{request_filename} -f

RewriteRule ^(.*) $1 [L]

RewriteRule ^(([^/]*)+)?$ index.php?a=$1 [L]

RewriteRule ^welcome/?$ index.php?a=welcome [NC]

RewriteRule ^stream/?$ index.php?a=stream [NC]

RewriteRule ^stream/logout/([^/]+)/?$ index.php?a=stream&logout=1&token_id=$1 [NC]

RewriteRule ^explore/?$ index.php?a=explore [NC]

RewriteRule ^explore/filter/([^/]+)/?$ index.php?a=explore&filter=$1 [NC]

RewriteRule ^upload/?$ index.php?a=upload [NC]

RewriteRule ^pro/?$ index.php?a=pro [NC]

RewriteRule ^stats/?$ index.php?a=stats [NC]

RewriteRule ^stats/filter/([^/]+)/?$ index.php?a=stats&filter=$1 [NC]

RewriteRule ^profile/([^/]+)/?$ index.php?a=profile&u=$1 [NC]

RewriteRule ^profile/([^/]+)/([^/]+)/?$ index.php?a=profile&u=$1&r=$2 [NC]

RewriteRule ^profile/([^/]+)/filter/([^/]+)/?$ index.php?a=profile&u=$1&filter=$2 [NC]

RewriteRule ^notifications/?$ index.php?a=notifications [NC]

RewriteRule ^notifications/filter/([^/]+)/?$ index.php?a=notifications&filter=$1 [NC]

RewriteRule ^settings/?$ index.php?a=settings [NC]

RewriteRule ^settings/([^/]+)/?$ index.php?a=settings&b=$1 [NC]

RewriteRule ^messages/?$ index.php?a=messages [NC]

RewriteRule ^messages/([^/]+)/([^/]+)/?$ index.php?a=messages&u=$1&id=$2 [NC]

RewriteRule ^track/([^/]+)/?$ index.php?a=track&id=$1 [NC]

RewriteRule ^track/([^/]+)/edit/?$ index.php?a=track&id=$1&type=edit [NC]

RewriteRule ^track/([^/]+)/report/?$ index.php?a=track&id=$1&type=report [NC]

RewriteRule ^track/([^/]+)/stats/?$ index.php?a=track&id=$1&type=stats [NC]

RewriteRule ^track/([^/]+)/likes/?$ index.php?a=track&id=$1&type=likes [NC]

RewriteRule ^track/([^/]+)/stats/filter/([^/]+)/?$ index.php?a=track&id=$1&type=stats&filter=$2 [NC]

RewriteRule ^track/([^/]+)/([^/]+)/?$ index.php?a=track&id=$1&name=$2 [NC]

RewriteRule ^playlist/([^/]+)/?$ index.php?a=playlist&id=$1 [NC]

RewriteRule ^playlist/([^/]+)/edit/?$ index.php?a=playlist&id=$1&edit=true [NC]

RewriteRule ^playlist/([^/]+)/([^/]+)/?$ index.php?a=playlist&id=$1&name=$2 [NC]

RewriteRule ^search/filter/([^/]+)/([^/]+)/?$ index.php?a=search&filter=$1&q=$2 [NC]

RewriteRule ^page/([^/]+)/?$ index.php?a=page&b=$1 [NC]

RewriteRule ^recover/?$ index.php?a=recover [NC]

RewriteRule ^recover/do/?$ index.php?a=recover&r=1 [NC]