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One thing I always appreciated about CoffeeScript was its [heregex syntax](https://coffeescript-cookbook.github.io/chapters/regular_exp...), which made regexes clear and easy to document.

Many CoffeeScript constructs were adopted into JavaScript and TypeScript, but unfortunately, heregexes weren't among them.

I agree. I'm pretty sure jashkenas got it from Ruby, which got it from Perl, with the `/x` flag (for extended regular expressions).

Later languages have added support for the `x` flag, including C# and Rust. There is also a stage 1 proposal for JavaScript: https://github.com/tc39/proposal-regexp-x-mode

Nice roundup, and thanks for sharing that proposal!

Notepad++ has /x mode as well.

I probably use regexes the most in notepad++