When would something like this be necessary?
Regexes often contain complex parts that repeat themselves throughout the regex or can be combined into higher level patterns. This adds support for that.
sounds like a parser use case.
From a cursory glance, I found only the numeric `range` support the standout feature I'd want in existing regex support.
[0] The unreasonable effectiveness of f-strings and re.verbose https://news.ycombinator.com/item?id=31457188
Otherwise, I find regex is extremely easy, since the problems it solves well are very simple, and one can develop it interactively by trial and error, by looking at the highlights in their editor.
I could possibly see actually using this if the playground had a similar "Try it on real text instantly" feature, but I've never had a problem with traditional regex+trial and error.
I'm glad that this project (and others like that others have highlighted here) allow us to improve on (1), and I am always encouraging my profession peers in computing to reconsider (2).