Definitely a bug in instanceof is something I want to get fixed quickly. The lack of RegEx is mentioned in http://www.espruino.com/FAQ, but ideally Espruino would recognise them and report that they're not supported at the very least.
Thanks for the pointer to URE - it looks good.
As far as submitting modules, there's a page on it here: http://www.espruino.com/Writing+Modules
Including a way of writing them that tends to minimize well and work efficiently with Espruino. You basically just issue a pull request - at the moment the volume of contributions is low enough that it actually works pretty well.
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