How to find the Postion of all matching substrings in a QStringList-CodePudding

i am looking for a way to find the cell position of all matching substrings in a QStringList.

The List is filled form a txt file looking like that:

10:36:50,590/2002/1800

10:36:50,621/2002/1801

10:36:50,652/2002/1802

10:36:50,684/2002/1803

10:36:50,715/2002/1803

10:36:50,746/2002/1803

10:36:50,777/2002/1803/0/0/Target_Hit
 
10:36:50,809/2002/1802

10:36:50,840/2002/1802

10:36:50,871/2002/1802

10:36:50,965/2000/1831/0/0/Target_Hit

Each cell of the QStringList contain one line of the txt file. Now i want to find the absolut number of hits and postion of the cells conatining the substring "Target_Hit".

I tried to find the number of it like that: int number_of_hits = List.indexOf(QRegExp(".*\Target_Hit$)); but that returns a -1 so i guess the QRegExp is incorrect.

CodePudding user response：

You cannot use indexOf for this because it would only return you one index, and it seems that you are looking for multiple.

I would read the file line by line, check each line if it contains what you are looking for, and take note of that, effectively this pseudo code:

initialise a counter to zero.
initialise a position list to an empty list.
read each line
    check if the line contains the search string.
    if it does: append the position into a list and increment the counter.
    continue the next line.

Then, at the end, you could have all that you desired to have.