void MusicUserLineEdit::showLabel(int s, int e)
{
    int textLength = text().length();
    labelCheck(m_strContains = (s <= textLength && textLength <= e));
}
void MusicUserLineEdit::showLabel()
{
    QRegExp mailRx("([a-zA-Z0-9][\\w-\\.]*)*[a-z0-9A-Z]@[a-z0-9A-Z][a-z0-9A-Z-]*[a-z0-9A-Z]\\.[a-zA-Z]{2,})");
    labelCheck(m_mailContains = (text().contains(mailRx)));
}
void MusicUserLineEdit::showLabel()
{
    QRegExp mailRx("([0-9A-Za-z\\-_\\.]+)@([0-9a-z]+\\.[a-z]{2,3}(\\.[a-z]{2})?)");
    labelCheck(m_mailContains = (text().contains(mailRx)));
}