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Re:Rulex – A new, portable, regular expression language by ZeroGravitas on Friday June 10, 2022 @11:50AM (#31695817)
I think this does that:

https://rulex-rs.github.io/docs/language-tour/basics/

> In Rulex, whitespace is insignificant, except between quotes. This means that we can add spaces and line breaks to make the code look clearer. We can also add comments to explain what the expressions are doing. They start with a # and span until the end of the line:

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