Remove wildcard from field then Group By using active record/mysql query

[eluser]RaZoR LeGaCy[/eluser]
I have been looking for this all over the net and I believe that I may be looking for the wrong terms.

I want to count(field_id) as tot, avg(field_score) as avg, and group by (field_title).

My problem is that I want MySQL to remove all wildcards before grouping field_title. I want title to be grouped but only after removing "[*]" and "(*)".

I would love to find an active record solution and the mysql query to learn this valuable complex query.

Thank you in advance.