php - Wordpress - add_rewrite_rule not passing $matches variable -


i have added rewrite rule 

add_rewrite_rule('^users/([^/]*)/?','index.php?page_id=123&user_slug=$matches[1]','top');

the problem correct page being opened, however, custom variable user_slug not being passed. if check query vars 

global $wp; print_r($wp->query_vars);

only page_id printed out. how pass other variable there?

make sure registering custom query variable wordpress before make rewrite call:

add_rewrite_tag( '%user_slug%', '([^/]*)' );

http://codex.wordpress.org/rewrite_api/add_rewrite_tag


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