void sanitizeUtf8(QString r, bool allowSpaces)
{
    for(int i = 0; i < r.size();)
    {
        const QChar c = r.at(i);
        const bool removeSpace = !allowSpaces && c.isSpace();

        if( removeSpace || !c.isPrint() || c.isMark() ||
        c.category() == QChar::Other_Control ||
        c.category() == QChar::Other_Format ||
        c.category() == QChar::Other_NotAssigned || c.category() == QChar::Other_PrivateUse ||
        c.category() == QChar::Symbol_Other ||

        // 'Arabic Presentation Forms-A'
        (c.unicode() >= 64336 && c.unicode() <= 65023) ||

        // 'Arabic Presentation Forms-B'
        (c.unicode() >= 65136 && c.unicode() <= 65279) ||

        // Replacement Chars / End of the line
        //c.unicode() == 65532 || c.unicode() == 65533 || c.unicode() == 65534 || c.unicode() == 65535 ||
        c.unicode() >= 65532 ||

        // Jamo Fillers
        c.unicode() == 4447 || c.unicode() == 4448 || c.unicode() == 12644

        /// DO NOT UNCOMMENT - Letter_Other is in use by chinese people
        /// c.category() == QChar::Letter_Other

        // This code definitely worked in 4.6 and was seen to break in 5.1, hasn't been tried since
#if QT_VERSION < 0x050000
        || c.category() == QChar::NoCategory
#endif
        )
        {
            r.replace(i, 1, "");
        }
        else
            ++i;
    }
}