QRegExp floating point matching

[kybernetes]

i want to use foating points in a line and i tried to do that

        if(line.contains("lineto"))
        {
            QRegExp rxValues("\\d+\\.\\d+");    // primitive floating point matching
            rxValues.indexIn(line);

            out << "obj.lineTo(" + rxValues.cap(1) +  ", " + rxValues.cap(2) << "\n";

            qDebug() << rxValues.cap(1);
            qDebug() << line;
        }

debug is like that

""
"512.00 512.00 lineto"
""
"512.00 0.00 lineto"
""
"0.00 0.00 lineto"
""
"0.00 512.00 lineto"

why it doest work? why rxValues.cap(1) is empty?

[SGaist]

Hi,

Because you're not capturing anything with that regexp. It should be "(\\d+)\\.(\\d+)"

On a side note, if you are using Qt 5, consider moving to QRegularExpression.

[kybernetes]

thanks for your fast reply.

i tried your suggestion and it works like that

qDebug() << rxValues.cap(1);
qDebug() << rxValues.cap(2);
qDebug() << line;

"512"
"00"
"512.00 511.00 lineto"

but i want the number "512.00" and "511.00"

as u see cap(1) = 512 and cap(2) = 00

and i was waiting cap(3) = 511 but i was "" nothing.

[jsulm]

QRegularExpression reg("(\\d+\\.\\d+)");
qDebug() << reg.match("512.00 512.00 lineto");

[SGaist]

Sorry, I misunderstood your original problem, @jsulm suggestion is the best way to go.

[kybernetes]

       Thanks for your answers. 

i used QRegularExpression and write my code like below. i think captured(1) is second number for me but debug is like that captured(0) and captured(1) is same but i didnt why.

i think;
captured(0) has to be 512.00 and captured(1) has to be 0.00

            QString line = "512.00 0.00 lineto";
            QRegularExpression rxValues("(\\d+\\.\\d+)");
            QRegularExpressionMatch match = rxValues.match(line);

            qDebug()<< match.captured(0);
            qDebug()<< match.captured(1);
            qDebug()<< line;

debug output

"512.00"
"512.00"
"512.00 0.00 lineto"

[jsulm]

QRegularExpressionMatchIterator iter = reg.globalMatch("512.00 2.00 lineto");
while (iter.hasNext()) {
    qDebug() << iter.next().captured();
}