QSortFilterProxyModel dont filter my treeview

[masoudk]

I used this code to my treeview display folders in my hard drive and this code works fine:

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QString sPath = "E:/";

dirModel = new QFileSystemModel(this);
dirModel->setFilter(QDir::NoDotAndDotDot | QDir::AllDirs);
dirModel->setRootPath(sPath);

ui->treeView->setModel(dirModel);

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Now I want to add filter to above code and I wrote this code for that purpose, but it show me an empty treeview while I have "clips" folder in my root of E:/ drive. Am I doing something wrong? Thank you for help

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QSortFilterProxyModel *proxyModel = new QSortFilterProxyModel(this);

proxyModel->setSourceModel(dirModel);
proxyModel->setFilterRegExp(QRegExp("clips", Qt::CaseInsensitive, QRegExp::FixedString));

ui->treeView->setModel(proxyModel);

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