[riffraff]

sadly, highly dependent on keyword layout, e.g. my keyboard has square brackets and the equals sign only accessible via a key combination, while the US keyboard does not.

It seems the only safe character across many countries are 0-9a-z.,-\ plus space/tab/return. Not a lot to work with :)

[lucian1900]

That's part of why I always use a US layout, even on UK keyboards. Also because I've grown up with it.