[Plugin: Redirection] Regex to Consolidating 301 Redirects

I have about 35 301 redirects from an permalink change a whielago I would like to consolidate into a single redirect using Regex.

Source URL format: /2011/02/my-post.html
Target URL fromat: /2011/02/23/my-post/

I need a Regex to match the source to the target where there is now a date and the .html has been replaced with ‘/’

The source part seems clear: ‘/(\d*)/(\d*)/(.*)’ or ‘/(\d*)/(\d*)/(.*).html’
But I am struggling on the target which needs to look for a new data element and match on the year, month and postname

https://www.ads-software.com/extend/plugins/redirection/