code: func (m *GorillaPath) Extract(result *Result, r *http.Request) {
  	result.Values = mergeValues(result.Values, m.Values(r.URL.Path))
  	if result.Handler == nil && m.strictSlash {
  		result.Handler = redirectPath(m.pattern, r)
  	}
  }
docs: // Extract returns positional and named variables extracted from the URL path.