QRegExp for removing all non alphanumeric charecters

[Jencek]

Seems to be working (Calhal's solution would work only with ascii - no interpunction characters).

[Maximus2]

Hey, Sorry to revive an old thread.

I am using your solution:

QString Util::cleanQString(QString toClean) {
 
    QString toReturn = toClean;
    toReturn.remove(QRegExp(QString::fromUtf8("[-`~!@#$%^&*()_—+=|:;<>«»,.?/{}\'\"\\\[\\\]\\\\]")));
    return toReturn;
}

QString Util::cleanQString(QString toClean) {

    QString toReturn = toClean;
    toReturn.remove(QRegExp(QString::fromUtf8("[-`~!@#$%^&*()_—+=|:;<>«»,.?/{}\'\"\\\[\\\]\\\\]")));
    return toReturn;
}

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The compiler is giving me theses 4 warnings that I would like to fix:
warning: C4129: '[' : unrecognized character escape sequence
warning: C4129: ']' : unrecognized character escape sequence
warning: C4129: '[' : unrecognized character escape sequence
warning: C4129: ']' : unrecognized character escape sequence

Using Qt 5.5.0 on VS2013