QT regularExpressions retrieve numbers

Question

I\'ve to split simple QStrings of the form \"number number number\",for example \" 2323 432 1223\". The code i use is

QString line;
QRegularExpression re(\"(\\         


        

Answer 1

If the usage of regular expressions isn't mandatory, you could also use QString's split()-function.

QString str("2323 432 1223");
QStringList list = str.split(" ");
for(int i = 0; i < list.length(); i++){
    qDebug() << list.at(i);
}

Answer 2

Your regex only matches 1 or more digits once with re.match. The first two values are Group 0 (the whole match) and Group 1 value (the value captured with a capturing group #1). Since there is no second capturing group in your pattern, match.captured(2) is empty.

You must use QRegularExpressionMatchIterator to get all matches from the current string:

QRegularExpressionMatchIterator i = re.globalMatch(line);
while (i.hasNext()) {
    qDebug() << i.next().captured(1); // or i.next().captured(0) to see the whole match
}

Note that (\\d+) contains an unnecessary capturing group, since the whole match can be accessed, too. So, you may use re("\\d+") and then get the whole match with i.next().captured(0).