Maybe you need to escape { ?

No. Doesn’t work…

As Wikipedia says GUID has another format.
This should help you

And don’t forget that you need to double \ in C++ code.

Well, doesn’t matter about format. I don’t have any clue about QRegExp (cause it requires training)…

Peppy wrote:

Well, doesn’t matter about format. I don’t have any clue about QRegExp (cause it requires training)…

What do you need to know? It’s pretty straightforward. Anything specific we can help you with?

Yes. It has something like order of commands, order of parsing or something like that, how it works…then I will understand it…how it works…

I think that you need to read something like this [regular-expressions.info]