Getting the fourth line QString

[MrErfan]

hi ,
I want to get the fourth line of a text inside QString

QString str = "1 \n 2 \n 3 \n 4 \n 5 \n 6 \n";

[arozon]

Quite simply use

foostring.split()...

Split and pass the argument as a char of a linebreak.
Then from the qstringlist the resulting indexes should be your line

[JonB]

@MrErfan
QStringList list = str.split("\n");
return list[3];

Have a look at the overloads of http://doc.qt.io/qt-5/qstring.html#split to decide just what you want to split on, e.g. perhaps a QRegExp.

EDIT: P.S. split() does not scale optimally if you have, say, a million+ lines in str --- let us know if that is a possible factor ;-)