how to remove the ":" in my .txt file

[victor wang]

Hi, i'm using qt5.5 on my computer.
I got a string from some website and put in the .txt file which i make.

And the string is as below.

MAC1:&nbsp;00:03:E1:86:42:AB<br>MAC2:&nbsp;00:03:E1:86:42:AC<br>Model:&nbsp;ADO 7" TERMINAL<br>PN:&nbsp;752-0005-01<br>SN:&nbsp;171613020001<br>ESN:&nbsp;1W1712000001MAC1:&nbsp;00:03:E1:86:42:AD<br>MAC2:&nbsp;00:03:E1:86:42:AE<br>Model:&nbsp;ADO 7" TERMINAL<br>PN:&nbsp;752-0005-01<br>SN:&nbsp;171613020002<br>ESN:&nbsp;1W1712000002

I'm gonna only take this "00:03:E1:86:42:AC" for my need.
What could i do ?
Please help!

[jsulm]

@victor-wang You can use a regular expression.
See http://doc.qt.io/qt-5.8/qregularexpression.html

One note: the title is misleading. You don't want to remove ":", but extract the MAC address.

[victor wang]

@jsulm
Thanks for telling me.
And now i got a problem here.
this is my code.

        if(!file.open(QIODevice::ReadWrite|QIODevice::Text))
        {
                qDebug("No MAC_addr this file");
        }
        else
        {
            /*if(MAC2==" ")
            {
                QTextStream stream2(&file);
                stream2<<MAC1;//"MAC1:"+MAC1;
            }
            else if(MAC1==" ")
            {
                QTextStream stream2(&file);
                stream2<<MAC2;
            }
            else
            {
                QTextStream stream2(&file);
                stream2<<MAC1;//"MAC1:"+MAC1;
                stream2<<MAC2;//"MAC2:"+MAC2;
            }*/
            QTextStream stream2(&file);
            stream2<<EIP_out;


            Process::executeProcessSync(QString("sh"),QStringList()<<"-c"<<"/bin/echo 5 > /sys/class/gpio/export");
            Process::executeProcessSync(QString("sh"),QStringList()<<"-c"<<"/bin/echo \"out\" > /sys/class/gpio/gpio5/direction");
            Process::executeProcessSync(QString("sh"),QStringList()<<"-c"<<"/bin/echo 0 > /sys/class/gpio/gpio5/value");
            if(!weeprom.open(QIODevice::ReadWrite|QIODevice::Text))
            {
                    qDebug("No eeprom for first MAC");
            }
            else
            {
                    QTextStream stream_weeprom(&weeprom);
                    QString tmpString = stream2.readLine();
                    stream_weeprom<<tmpString;
                    stream_weeprom.seek(43);
                    QString eepromstring = stream_weeprom.readLine(17);
                    qDebug()<<eepromstring;
                    QRegularExpression re("(\\w+)");
                    QRegularExpressionMatchIterator i = re.globalMatch(eepromstring);

                    while(i.hasNext())
                    {
                        QRegularExpressionMatch match = i.next();
                        QString word = match.captured(1);
                        words << word;

                    }
                    qDebug()<<words;
                    stream2<<words;

            }
            weeprom.close();
}

I can't do "stream2<<words;" i think it is because i can't write a QStringList in to it.
I don't know how to fix it.
Is there any method can change the type in to QString or char?
Please Help!

[jsulm]

@victor-wang You should always mention the error you get.
If it is a QStringList then you can just iterate over it and put each element into stream2.

[SGaist]

Hi,

Or use QStringList::join to do it in one pass.

[VRonin]

or use a more meaningful regexp like
QRegularExpression regexp("MAC\\d+:.+?;([0-9a-fA-F]{2}:[0-9a-fA-F]{2}:[0-9a-fA-F]{2}:[0-9a-fA-F]{2}:[0-9a-fA-F]{2}:[0-9a-fA-F]{2})"); and use the cap(1) to retrieve the mac address