gistfile1.php

<?php
    function create_rewrites() {
        add_rewrite_rule(
            'pamelding/([^/]+)/?$',
            'index.php?pagename=pamelding&courseid=$matches[1]',
            'top'
        );
        add_rewrite_rule(
            'kursdetaljer/([^/]+)/([^/]+)/?$',
            'index.php?pagename=kursdetaljer&courseid=$matches[1]',
            'top'
        );
        add_rewrite_rule(
            'kursliste/([^/]+)/?$',
            'index.php?pagename=kursliste&coursetype=$matches[1]',
            'top'
        );
    }

    function create_query_vars( $vars ) {
        $vars[] = 'courseid';
        $vars[] = 'coursetype';

        return $vars;
    }

    add_action( 'generate_rewrite_rules', 'create_rewrites' );
    add_action( 'after_switch_theme', 'flush_rewrite_rules' );
    add_action( 'query_vars', 'create_query_vars' );