Question

Instead of doing something like this: (proxyModel is a QSortFilterProxyModel)

proxyModel->setFilterRegExp(".*");

Is there a right way to clear the filter? Because that looked wrong to me.

Answer 1

From the filterRegExp property docs:

If no QRegExp or an empty string is set, everything in the source model will be accepted.

So the “proper” way of clearing the filter is to pass an empty string rather than a match-all regex.