Search by SKU with or without dash

Hi support,

I have an e-commerce-style website, on each product pages we have SKU identifier in the form 90919-02248 and similar.

What happens is, if users search for the product above by typing 9091902248 (with no dash) they won’t find anything.

I tried installing Relevanssi and putting “-” in the stop word list without success.

Anyone with the same issue who can help with a solution?

thanks everybody