Sooo the problem was my brackets around the content in the condition I think.
I’m still not so hot on these things, but I use these rules and they work:
RewriteCond %{REQUEST_URI} ^/(review|preview|feature).*\-[0-9]+$
RewriteRule ^review/(.*)\-[0-9]+$ /$1 [R=301,L]
RewriteRule ^preview/(.*)\-[0-9]+$ /$1 [R=301,L]
RewriteRule ^feature/(.*)\-[0-9]+$ /$1 [R=301,L]
note: the (review|preview|feature) but is an x OR y OR z, as I have the rule working for any of those folders specifically.