Using transform rules to replace old redirect rule

Previously we had a redirect rule which worked well, but since the redirect rules are being removed, we are struggling to understand how the transform rule works.

We want to target a specific host
eg: blog.domain.com
The old articles all use .html at the end
blog.domain.com/article1.html

We want to remove the .html so the url looks like this
blog.domain.com/article1/

Can someone point us in the right direction as to how the transform rule should look

Any help would be appreciated.
M.
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