How to match "(" in a regexp?

[Lykurg]

You have to double escape the \ . It looks very nasty but it must be done:

QString s = "(123) (333s) (2)";
QRegExp rx("\\(([0-9]+)\\)");
int pos = 0;
while ((pos = rx.indexIn(s, pos)) != -1) {
  qWarning() << rx.cap(1);
  pos += rx.matchedLength();
}

QString s = "(123) (333s) (2)";
QRegExp rx("\\(([0-9]+)\\)");
int pos = 0;
while ((pos = rx.indexIn(s, pos)) != -1) {
  qWarning() << rx.cap(1);
  pos += rx.matchedLength();
}

To copy to clipboard, switch view to plain text mode