QRegExp length of matched group

Currently it is possible to tell the staring position of a QRegExp match group:

rx.pos(nth);

and the only way to find out the length of the captured text is to:

rx.cap(nth).length();

If I understand it correctly, this copies the captured characters to create a QString which is immediately thrown away after calling length().

I have not done any performance measurements but perhaps it would be useful to expose the length of match directly:

rx.len(int nth);

or to expose the end of the matched text group:

rx.end(int nth);