Adding a custom rewrite rule for gallery/categories page

Question

I've written a simple shortcode and using it on my gallery page. The URL for the page looks something like this:

http://mysite.dev/gallery/?view=category-name

but I want to be able to use

http://mysite.dev/gallery/category-name

When I use a URL like so, WP redirects to what seems the nearest match it can find. For example

http://mysite.dev/gallery/nature

redirects to

http://mysite/home/nature

I've tried implementing a rewrite rule:

function add_custom_rewrites()
{
    remove_filter('template_redirect', 'redirect_canonical');

    add_rewrite_rule('^gallery/([^/]*)/?$', 'index.php/gallery/?category=$matches[1]', 'top');
    add_rewrite_tag('%category%', '(.+)');

    flush_rewrite_rules();
}
add_action('init', 'add_custom_rewrites');

but the /gallery/category page always redirects to try and by some means find the nearest matching page.

Can anyone help, please?

Answer 1

To answer my own question, I didn't need to remove the 'redirect_canonical' filter, and I only needed to change the 2nd parameter for add_rewrite_rule. The resulting function looks as follows:

function add_custom_rewrites()
{
    add_rewrite_tag('%category%', '(.+)');
    add_rewrite_rule('^gallery/([^/]*)/?$', 'index.php?pagename=gallery&category=$matches[1]', 'top');

    flush_rewrite_rules();
}
add_action('init', 'add_custom_rewrites');