I have a string, such as: 

QString Output;

Output="Duration: 00:01:25.65, start: 0.050000, bitrate: 2709 kb/s"`;

My question is how can I obtain those duration, start, and bitrate values separately.  

For example, I need to get bitrate value, so how can I get the bitrate value in c++ using a regular expression. 

Note that I don't have good knowledge about regular expressions.