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//! [0]
def __init__(self, parent):
    QSortFilterProxyModel.__init__(self, parent)
//! [0]

//! [1]
def setFilterMinimumDate(self, date):
    self.minDate = date
    self.invalidateFilter()

//! [1]

//! [2]
def setFilterMaximumDate(self, date):
    self.maxDate = date
    self.invalidateFilter()

//! [2]

//! [3]
def filterAcceptsRow(self, sourceRow, sourceParent):
    index0 = sourceModel().index(sourceRow, 0, sourceParent)
    index1 = sourceModel().index(sourceRow, 1, sourceParent)
    index2 = sourceModel().index(sourceRow, 2, sourceParent)

    regex = filterRegExp()
    return (regex.indexIn(sourceModel().data(index0)) != -1
            or regex.indexIn(sourceModel().data(index1)) != -1
           and dateInRange(sourceModel().data(index2))
//! [3]

//! [4] //! [5]
def lessThan(self, left, right):
    leftData = sourceModel().data(left)
    rightData = sourceModel().data(right)
//! [4]

//! [6]
    if isinstance(leftData, QDateTime):
        return leftData < rightData
    else:
        emailPattern = QRegExp("([\\w\\.]*@[\\w\\.]*)")

        if left.column() == 1 && emailPattern.indexIn(leftData) != -1:
            leftData = emailPattern.cap(1)

        if right.column() == 1 && emailPattern.indexIn(rightData) != -1:
            rightData = emailPattern.cap(1)

        return leftString < rightString

//! [5] //! [6]

//! [7]
def dateInRange(self, date):
    return (!minDate.isValid() || date > minDate)
           && (!maxDate.isValid() || date < maxDate)

//! [7]