C++ Url Routing (and possible parsing)

Question

I start an api server with Boost Beast. I use the async http server. My goal is to do the same things as Express.js For now I route like this :

if(req.method() == http::verb::post)
    {
        if(req.target() == "/mypath")
        {
                                //do stuff
        }
else
    if(req.method() == http::verb::get)
    {
        if(req.target() == "/another/path")
        {
               //do stuff
         }

I would like to route like this : route.get("/mypath", callback) ;

But how do that?