QT去除QString字符串中空格的方法

QString str1 = " 1 2 3 ";
str1.remove(QRegExp("^ +\\s*"));
qDebug() << "str1=" << str1;

QString str2 = " 4 5 6 ";
str2.remove(QRegExp("\\s* +$"));
qDebug() << "str2=" << str2;

QString str3 = " 6 7 8 ";
str3.remove(QRegExp("\\s"));
qDebug() << "str3=" << str3;

//\t,\n,\v,\f,\r都属于simplified()处理的空白范围
QString str4 = "  \t,\n,\v,\f,\rhello\t world\n123\r\n ";
qDebug() << "str4.simplified()=" << str4.simplified();
QString str5 = "  \t,\n,\v,\f,\rhello\t world\n123\r\n ";
qDebug() << "str5.trimmed()=" << str5.trimmed();