my .htaccess file’s full code is

# BEGIN 

Options +FollowSymLinks -MultiViews
RewriteEngine on
RewriteBase /
RewriteCond %{QUERY_STRING} ^(.*)$
RewriteRule ^/show_article/([0-9]+).php /show_article.php?article_id=$1


# END 

i want url as ‘mysite.com/show_article/17’ for the link ‘mysite.com/show_article?article_id=17’

.htaccess file is working, but the RewriteRule is not working. i am getting the same url (mysite.com/show_article?article_id=17). is anything missing in the .htaccess file? can anybody help me out?