Regular Expressions!

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PaddeK
Are functions as replacement supported? I would love to be able to use my RunlengthEncoding snippets.
```
let RLE = {
    enc: t => t.replace(/([^\d])\1*/g, m => m.length > 1 ? m.length + m[0] : m[0]),
    dec: t => t.replace(/(\d+)([^\d])/g, (m, r, c) => new Array(+r + 1).join(c))
}
```
-- Edit --
I did flash this version on my espruino wifi and it seems to work!
But i run into LOW MEMORY issues while using RLE.dec with a ~5k chars long string.

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