add_rewrite_rule on multisite doesn't work

Question

I define a rewrite rule on an init hook like:

add_rewrite_rule( 'foobar/(abc|def|ghi)/(.+)(/(\d.+))', 'index.php?my_action=$matches[1]&my_name=$matches[2]&my_version=$matches[4]', 'top');

This works with following URL on a single WP installation:

http://example.com/foobar/def/whatever/1.2

However it doesn't on a multisite installation.

It seems there's problem with rewrite rules on multisite an there's ticket #19896 which describes a similar problem on "non WP rules"

I have no idea what I should add to the .htaccess file and I prefer a "proper" solution.

EDIT:

I have forget something important:

I'm using WordPress MU Domain Mapping to use different domains and while the network is on network.example.com the site I use add_rewrite_rule is sub.example.com

Answer 1

It seems the problem is not with add_rewrite_rule rather with the .htaccessfile for the multi site.

One of the test addresses was

http://example.com/foobar/def/whatever.php

Here's a part of the htaccess which causes the result (Line 2)

RewriteRule ^([_0-9a-zA-Z-]+/)?(wp-(content|admin|includes).*) $2 [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(.*\.php)$ $2 [L]
RewriteRule . index.php [L]

If I comment this line out it works as expected but it may break other thing. So you have to add your own rule above the latest block:

RewriteRule ^([_0-9a-zA-Z-]+/)?foobar/(abc|def|ghi)/(.+)(/(\d.+))$ index.php?my_action=$2&my_name=$3&my_version=$5 [R=301,L]