Find sequence in QString

[beecksche]

Hi,

In a .txt file i need to find a specific sequence in a line.

The lines which i need to detect are:

  0: -0,385236
  1: 0,141017
  2: 4,39365
  3: 12,0689
  4: 7,32349
  5: -4,69991
  6: -1,30162

Sequence: Space - Integer - Double Point - Space - Float Number

I started to read each line of the file. But i have no clue how to detect this sequence.

QFile file("file.txt");
if (!file.open()) {
   QTextStream stream(&file);
   forever {   
      QString line = stream.readlLine();
      if (line.isNull())
         break;

    // now detect the sequence
   }
}

I'm not sure if i can use the QRegExp class.

Thanks for help!

[raven-worx]

@beecksche
use QRegularExpression:

QRegularExpression rx("([0-9])+:\\s(\\-?[0-9]+,[0-9]+)");
QRegularExpressionMatch match = rx.match( line ); // line == "5: -4,69991"
if (match.hasMatch())
{
    QString id = match.captured(0); // id == "5"
    QString value = match.captured(1); // value == "-4,69991"
    // ...
}

[beecksche]

@raven-worx

Thanks a lot!

In the captured() function i had to change the argument:

        QString id = match.captured(1); // id == "5"
        QString value = match.captured(2); // value == "-4,69991"

Edit:

To use it, i also had to change the expressio to:

QRegularExpression rx("([0-9]+):\\s(\\-?[0-9]+,[0-9]+)");

to get the first integers bigger the 10.