RewriteEngine on

#http://www.aa.com/webapp/sell_list.php?fid=111222
RewriteCond %{QUERY_STRING} ^fid=([0-9]+)
RewriteRule ^sell_list\.php$   sell/list [L]
#http://www.aa.com/webapp/sell_list.php
RewriteRule ^sell_list\.php$  sell [L]
#http://www.aa.com/webapp/bencandy.php?fid-55-id-21619-page-1.htm
RewriteCond %{QUERY_STRING} ^fid-([0-9]+)-id-([0-9]+)-page-1\.htm
RewriteRule ^bencandy\.php(.*)$ news/bencandy.php?fid=%1&id=%2  [L]