获取网页源码中的链接

		QString str = QString::fromLocal8Bit("<img id=\"app-logo\" alt=\"???????APP\" src=\"http://abc/setup/ico.jpg\" >") + 
			QString::fromLocal8Bit("<img id=\"app-logo\" alt=\"???????APP\" src=\"http://www.abc/setup/ico3.jpg\" >");
		QRegularExpression rx(".*src=\"(?<Url>.*)\".*");

		QStringList strList = str.split("img");
		foreach(QString s,strList)
		{
			QRegularExpressionMatch rm = rx.match(s);

			if (rm.hasMatch())
			{
				qDebug() << rm.captured("Url");
			}
		}

http://abc/setup/ico.jpg

http://www.abc/setup/ico3.jpg

匹配以.mp3或.wma结尾的文件

	foreach(QUrl url,urlList)
	{
		QString file_name = url.toLocalFile();

		QRegularExpression rx(".*[.wma$][.mp3$]");
		QRegularExpressionMatch rm = rx.match(file_name);
		if (rm.hasMatch())  
		{
			qDebug()<<file_name;
		}
	}