CODEWITHSUNDEEP
c++qt
George
George

Reputation: 630

How do I get a part of string in Qt?

I have a set of strings that satisfy the following pattern: sometext_number. So, I always have a number after '_' symbol. Is there a convenient way to get that number from a string regardless of its size?

Upvotes: 0

Views: 2092

Answers (3)

Turtle10000
Turtle10000

Reputation: 252

If you are using QString anyways, you can do

QString s = "sometext_5";
int index = s.indexOf("_");
int number = s.mid(index+1).toInt();

Upvotes: 1

thibsc
thibsc

Reputation: 4079

If you are sure that you always have "sometext_number", you can test the following solutions:

Using QString::split():

QString str = "hello_1234";
int number = str.split('_').last().toInt();

Using QRegularExpression::match():

QString str = "world_5678";
QRegularExpression regex("\\w+_(?<number>\\d+)");
QRegularExpressionMatch m = regex.match(str);
int number = m.captured("number").toInt();

Upvotes: 5

user11222840
user11222840

Reputation:

You can use std::find, which returns you the index of the element you're looking at, and then use substr on your string, given in parameter the index where you want to stop splitting

Upvotes: 0

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