How to filter columns with numbers when subclassing QSortFilterProxyModel?

Hi guys, I am new to QT.

Now I am trying to realize a project but meet some problems.

I wanna filter one column which contains numbers only, for example I wanna the table view shows rows with number less than 100 in this columns. I used setFilterRegExp and setFilterKeyColumn to filter columns with strings. However, I don't find the way to filter with numbers.

I think I should subclass QSortFilterProxyModel to do it but I don't know how to do it...

Can anyone help me? Thanks! :)

You have to reimplement QSortFilterProxyModel::filterAcceptsRow()