QLineEdit应接受范围为[0 - FFFFF]的十六进制值

#include <QApplication>
#include <QLineEdit>
#include <QIntValidator>

int main(int argc, char *argv[]) {
    QApplication app(argc, argv);

    QLineEdit lineEdit;
    QIntValidator *validator = new QIntValidator(0, 0xFFFFFF, &lineEdit);
    lineEdit.setValidator(validator);
    lineEdit.show();

    return app.exec();
}

#include <QApplication>
#include <QLineEdit>
#include <QRegExpValidator>

int main(int argc, char *argv[]) {
    QApplication app(argc, argv);

    QLineEdit lineEdit;
    QRegExp rx("^[0-9A-Fa-f]{1,6}$");
    QRegExpValidator *validator = new QRegExpValidator(rx, &lineEdit);
    lineEdit.setValidator(validator);
    lineEdit.show();

    return app.exec();
}