Regex Condition for rewriting category from html to non-html

I want to redirect all my .html Categories to non.html.
Like this.
www.server.com/category/subcategory.html -> www.server.com/category/subcategory/

Its working fine with this line:

RedirectMatch 301  ^/([^/]+)/([^/.]+).html$ /$1/$2

Now the difficult part:
I dont want this rule to be applied, if category contains a certain word/string:
www.server.com/category-computer/subcategory.html -> www.server.com/category-computer/subcategory.html

How can I achieve this?