QLineEdit edit;
    edit.setText("lox 123 4,5 lox100500 -34.66");
    QSet<QString> numbersList;
    QSet<QString> elementsList;
    QRegularExpressionMatchIterator i = QRegularExpression("(?<!\\S)([-]?\\d+[.,]?\\d*)(?!\\S)").globalMatch(edit.text());
    while (i.hasNext())
        numbersList.insert(i.next().captured(1));
    i = QRegularExpression("(\\S+)").globalMatch(edit.text());
    while (i.hasNext())
        elementsList.insert(i.next().captured(1));
    qDebug() << "bad set" << elementsList.subtract(numbersList);