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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
Ok, just added a bug for those: https://github.com/espruino/Espruino/issues/522 and https://github.com/espruino/Espruino/issues/523
However, I've got to wonder what you're trying to do on Espruino where you need this? Unfortunately I think at the moment implementation of more JS language features has to take a back seat to fixing problems that users are encountering when they're trying to use it for controlling hardware.
As far as RegEx, I'd like to implement it, but it's a matter of finding a compact RegEx library that implements RegExes per the JS standard and also has a suitable license. I did have a quick look but didn't find one.
The small ones I did find managed to fit into maybe 5k - which would be ok on the Pico, but more of a struggle on the original board.