#include <iostream>#include <QtCore>using namespace std;int main(int argc, char *argv[]){    QCoreApplication app(argc, argv);    QStringList capList;    int pos;    bool matched;    //QRegExp rx("[A-Za-z_]+[A-Za-z_0-9]*");    QRegExp rx("\\b(\\w+)\\W+\\1\\b");    if(!rx.isValid())    {    	cout << qPrintable(rx.errorString());    	return -1;    }        QFile file("main.cpp");    if (!file.open(QIODevice::ReadOnly | QIODevice::Text))         return -1;    QTextStream in(&file);    while (!in.atEnd()) {        QString str = in.readLine();	 	pos = 0;	 	matched = false;	 	while ((pos = rx.indexIn(str, pos)) != -1) {	 		capList = rx.capturedTexts(); 			cout << qPrintable(capList.at(0)) << "\t"; 				     	pos += rx.matchedLength();	     	matched = true;	 	} 		if(matched) 			cout << endl;    }     return 0;}