Your coordinate format is correct (impressive by the way, considering the syntax
. However, the format will only match either a latitude or a longitude, not a pair of them.
The second, a bit more serious thing, is that the coordinate format seems to become corrupted as it goes through the database (the °-sign turns into a question mark over here). We will look into this and I'll get back to you when we've made some progress.
It would be appreciated if you could verify this. If you save the coordinate format, close the app, restart it and then open the coordinate format again, has the ° become a question mark?