It can be the same thing in Europe, at least the contracts I've seen say so.
I'm not sure which European country you are referring to, but as a German I'd look at you funny if you had the audacity to put something like that in an employment contract (but honestly, I very strongly doubt any employer would do so in the first place).
I signed the contracts anyway assuming that most likely the company would not be interested in what I created outside working hours (or even know of it) and that they would only get interested if it becamse really successful, in which case I would probably have the means to defend it.
No, but should be likely that it is, right? Not worth the risk to put such clauses in there otherwise. And I was talking about the UK.