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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, in that case I'd suggest:
/filename="([^"]+)"/g.exec("form-data; name=\"file\"; filename=\"file.txt\"")[1]Which matches
filename="..."and returns what's inside the quotes