Implement a Custom Tag for Use in Permalinking

Essentially, what I’m trying to do is this:

Create a custom permalink tag, %articleId% that corresponds to a meta field I have defined in wp_postmeta -> article_id

We use an 8 digit article ID to keep track of our content instead of normal post_id’s so we need it in the URL for easy identification.

The end result is this (/%category%/%post_title%-%article_id%/) should resolve to something like /news/google-is-great-$99999999/

I don’t need it to mean anything per se… just to display as text in the URL

Does anyone know the best way to go about this?

Thanks in advance!