我写了一个源代码,如:
int main(int argc, char *argv[]) {
QString x = "start some text here end";
QString s = "start";
QString e = "end";
int start = x.indexOf(s, 0, Qt::CaseInsensitive);
int end = x.indexOf(e, Qt::CaseInsensitive);
if(start != -1){ // we found it
QString y = x.mid(start + s.length(), ((end - (start + s.length())) > -1 ? (end - (start + s.length())) : -1)); // if you dont wanna pass in a number less than -1
or
QString y = x.mid(start + s.length(), (end - (start + s.length()))); // should not be any issues passing in a number less than -1, still works
qDebug() << y << (start + s.length()) << (end - (start + s.length()));
}
}
问题是,在我的文本文件中经常发现“end”这个词。那么,有没有办法创建一个 indexOf 方法,它只搜索出现在 "QString s = "start" " 之后的第一个 " QString e = "end" " ?问候