auto *edit = new QLineEdit();
QRegExp regx("[a-zA-Z0-9\\x4e00-\\x9fa5]+");//限制只能输入字母数字和汉字
QRegExpValidator *validator1 = new QRegExpValidator(regx, edit);
edit->setStyleSheet("background:transparent;border-width:0;border-style:outset");
edit->setMaxLength(20);
https://blog.csdn.net/tieshuxianrezhang/article/details/79060141