WordPress URL rewrite regex

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I’m having trouble trying to learn how to write this url into a regex template to add in as a rewrite. I’ve tried various regex sandboxes to figure it out on my own but they won’t allow a “https://wordpress.stackexchange.com/” for instance when I copy an expression from here for testing: enter image description here

I’ve got a custom post type (publications) with 2 taxonomies (magazine, issue) which i’m trying to create a good looking url for.

So after many hours i’ve come here to find out how I can convert this

index.php?post_type=publications&magazine=test-mag&issue=2016-aug

to a templated regex expression (publication, magazine and issue are constant) that can output

http://example.com/test-mag/2016-aug/

and hopefully with room to extend if an article is followed through from that page.

Thanks in advance.

1 Answer
1

From the wordpress documentations – https://codex.wordpress.org/Using_Permalinks

Using %category% with multiple categories on a post

When you assign multiple categories to a post, only one can show up in
the permalink. The categories are ordered alphabetically. In each
group of sub-categories the order will also be alphabetical. (see
Manage Categories). The post will still be accessible through all the
categories as normal.

You can however reach what you want by creating a page with the slug listpublications and adding the folllowing code: 

add_action('init', 'rewrite');
add_filter('query_vars', 'query_vars');

function rewrite(){
    add_rewrite_rule('listpublications/([^/]+)/([^/]+)/?$', 'index.php?pagename=listpublications&magazine=$matches[1]&issue=$matches[2]','top');
}

function query_vars($query_vars) {
    $query_vars[] = 'magazine';
    $query_vars[] = 'issue';
    return $query_vars;
}

Now go to settings -> permalinks and click save. This will add the new rewrite rules, so this is very important.

Now create a template file in your theme folder named page-listpublications.php and add the following code between the footer and header.

 global $wp_query;

    $query_args = array(
    // show all posts matching this query
        'posts_per_page'    =>   -1,
    // show the 'publications' custom post type
        'post_type'         =>   'publications',
        // query for you custom taxonomy stuff
        'taq_query' => array(
            array(
                'taxonomy'  =>   'magazine',
                'field'     =>   'slug',
                'terms'     =>   $wp_query->query_vars['magazine']
                ),
            array(
                'taxonomy'  =>   'issue',
                'field'     =>   'slug',
                'terms'     =>   $wp_query->query_vars['issue']
                )
            )

        );

   //fetch results from DB
    $query = new WP_Query( $query_args );

    if ($query->have_posts()):  while ($query->have_posts()): $query->the_post(); 
     // do something sweet with the results
    the_content();

Visiting www.yourdomain.com/listpublications/test-mag/2016-aug should give you all publications in test magazine and in issue 2016-aug.

Hope this helps 🙂

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