Qstring: How to use regexp to slip words every two characters.

doodle

E.p slip QString("123456") into ("12", "34", "56");
and slip QString("1234567") into (“12”, "34", "56", "7")

mrjj

Hi
If its always every two char then you can just loop over it.


  QString Input = "1234567";
  QString Out;
  for (int c = 0; c < Input.length(); ++c) {
    Out += Input[c];
    if ( c % 2)
      Out += " ";
  }

  qDebug() << Out;

"12 34 56 7"

Paul Colby

No sure why you want to use regular expressions (@mrjj 's solution would be faster), but...

You can't use QString::split() because those methods take a separator, and you have none. So you'd have to use QRegularExpression::globalMatch() instead, like:

QStringList parts;
QRegularExpressionMatchIterator i = QRegularExpression("..?").globalMatch(QString("1234567"));
while (i.hasNext()) {
   parts << i.next().captured(0);
}
qDebug() << parts;

Outputs:

("12", "34", "56", "7")

But yeah, for such a simple case, some simple index-based loop, like @mrjj suggested, would be much more efficient.

Cheers.

doodle

@mrjj Is it possible use regexp to make it?

mrjj

@doodle
@Paul-Colby version is the regexp version.
Even more verbose I think its more solid
as input can be much more different and it still works :)

doodle

@Paul-Colby Thanks!
I need to process some Qstring like this " 12 ab, 1a 2ab f 12efa ", and I want to convert it to QStringList like this ("12", "ab", "1a", "2a", "b", "f", "12", "ef", "a").

QString string("  12 ab, 1a, 2ab f 12efa    ");
    QStringList list;
    list = string.split(QRegularExpression("[\\s|,]"), QString::SkipEmptyParts);

Outputs:

("12", "ab", "1a", "2ab", "f", "12efa")

So if the regexp is able to split every two , I can make it just with

QString::split

Paul Colby

@doodle said in Qstring: How to use regexp to slip words every two characters.:

I need to process some Qstring like this " 12 ab, 1a 2ab f 12efa ", and I want to convert it to QStringList like this ("12", "ab", "1a", "2a", "b", "f", "12", "ef", "a").

QStringList parts;
QRegularExpressionMatchIterator i = QRegularExpression("[^\\s,]{1,2}").globalMatch(QString(" 12 ab, 1a 2ab f 12efa "));
while (i.hasNext()) {
   parts << i.next().captured(0);
}
qDebug() << parts;

Output:

("12", "ab", "1a", "2a", "b", "f", "12", "ef", "a")

Cheers.

doodle

@Paul-Colby @mrjj Thanks!