code: func (x *Context) RoutePattern() string {
  	routePattern := strings.Join(x.RoutePatterns, "")
  	return strings.Replace(routePattern, "/*/", "/", -1)
  }
docs: // RoutePattern builds the routing pattern string for the particular
  // request, at the particular point during routing. This means, the value
  // will change throughout the execution of a request in a router. That is
  // why its advised to only use this value after calling the next handler.
  //
  // For example,
  //
  //   func Instrument(next http.Handler) http.Handler {
  //     return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
  //       next.ServeHTTP(w, r)
  //       routePattern := chi.RouteContext(r.Context()).RoutePattern()
  //       measure(w, r, routePattern)
  //   	 })
  //   }