const QRegularExpression re("X([-+]?\\d*\\.?\\d+)\\s+Y([-+]?\\d*\\.?\\d+)");
QTextStream in(&file);
while(!in.atEnd()) {
    QString line = in.readLine();
    const QRegularExpressionMatch reMatch = re.match(line);
    if(reMatch.hasMatch())
        qDebug() << "X: " << reMatch.captured(1) << " Y: " << reMatch.captured(2);
}