QRegExp not supporting \n back-references in Lookaheads?
Per the QRegExp class ref, a search expression can refer back to captured text with a backreference, \n, and gives an example. However this appears not to be working when the backreference is within a lookahead, for example the expression,
will find a bad italic markup such as
However, the same with a backreference,
does not find anything, nor of course the generalized version,
either. Does anyone know if this a bug or a planned restriction?
QRegExp is indeed rather limited. I don't know if this issue you run into is a (known) limitation (can't find it in de docs with a quick scan). However, I do know that this issue will be addressed in Qt 5, as the regexp engine will be replaced by something a bit more standard, featured and performant.