How to print the value of a sub-string each time it occurs in another string in Qt?

Question

I'm working on a qt project, I have a sub-string and I want to search for this string in another string and print it each time it occurs. I have a string 1234-1456-11234-1 I want to print a each time I found 1234-1 I used the function contains but it prints the sub-string once not each time it occurs.

Answer 1

I think you are looking for the indexOf method as follows:

main.cpp

#include <QString>
#include <QDebug>

int main()
{
    QString substring("substring");
    QString string("foosubstringbarsubstringbazsubstringhellosubstringworld");
    for (int i = 0; (i = string.indexOf(substring, i)) != -1; ++i)
            qDebug() << string.mid(i);
    return 0;
}

main.pro

TEMPLATE = app
TARGET = main
QT = core
SOURCES += main.cpp

Build and Run

qmake && make && ./main

Output

"substringbarsubstringbazsubstringhellosubstringworld"
"substringbazsubstringhellosubstringworld"
"substringhellosubstringworld"
"substringworld"