CODEWITHSUNDEEP
c++regexqtqstring
tobilocker
tobilocker

Reputation: 981

How to escape the delimiter when splitting a QString?

How can i split a QString by a character, e.g.: '+' and do not split when that character is escaped: '\+'?

Thanks!

As requested, some more detail:

The String to split: "a+\+"

The delimiter: '+'

The desired output: "a", "+"

Upvotes: 2

Views: 887

Answers (2)

Ganton
Ganton

Reputation: 207

If, instead of a "+" as a separator, you can use space as a separator... splitArgs does the work for you:

https://stackoverflow.com/a/48977326/2660408

Upvotes: 0

Jonathan Mee
Jonathan Mee

Reputation: 38909

You'll want to use the globalMatch with a regular expression to split that selects everything but a non-escaped '+':

(?:[^\\\+]|\\.)*

Live Example

So given QString foo you can iterate through the list using a QRegularExpressionMatchIterator:

QRegularExpression bar("((?:[^\\\\\\+]|\\\\.)*)");
auto it = bar.globalMatch(foo);

while(it.hasNext()){
    cout << it.next().captured(1).toStdString() << endl;
}

In C++11 you can also use a cregex_token_iterator:

regex bar("((?:[^\\\\\\+]|\\\\.)+)");
copy(cregex_token_iterator(foo.cbegin(), foo.cend(), bar, 1), cregex_token_iterator(), ostream_iterator<string>(cout, "\n"));

Live Exampe

In the unfortunate event that you have neither Qt5, nor C++11, nor Boost, you can use QRegExp:

QRegExp bar("((?:[^\\\\\\+]|\\\\.)*)");

for(int it = bar.indexIn(foo, 0); it >= 0; it = bar.indexIn(foo, it)) {
    cout << bar.cap(1).toStdString() << endl;
}

Upvotes: 1

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