How to extend the string class to return this inside the square bracket?

[jfondren]

On Friday, 13 August 2021 at 22:09:59 UTC, Marcone wrote:
>
> Isn't there some unario operator template that I can use with 
> lambda to handle a string literal?

So, something other than an exact "lit"[0..this.xx(..)] syntax is 
fine?

What didn't you like about `"Hello 
World!".findSplit("o")[0].writeln;` then?

What is a real example of something you want to do?