WordPress custom slug rewrite

I find answer

add_action('query_vars','foo_set_query_var');
function foo_set_query_var($vars) {
    array_push($vars, 'tags');
    return $vars;
}

add_rewrite_rule('^gallery-snow/?','index.php?post_type=gallery&tags=snow','top');

And in page use

get_query_var('tags')

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