Microsoft.AspNetCore中的URL重定向中间件。重写不会重定向

我正在尝试将.NETCore中的一个URL重定向到另一个URL。原始URL为

http://localhost:3000/en/ad/test/1758

下面是my Startup.cs的Configure()方法。由于某种原因,就我所知,这条规则从未被遵守过。如果我把正则表达式改为 ^(.*)$ 当然,它每次都会成功,但对于下面的正则表达式,它就是不起作用。

为什么?

public void Configure(IApplicationBuilder app, IHostingEnvironment env, IApplicationLifetime applicationLifetime, ILoggerFactory loggerFactory)
{
    app.UseRewriter(new RewriteOptions().AddRedirect(@"^en/ad/.*/(\d+)$", this.Configuration["Api:PublicUrl"] + "/en/ad/$1"));

    applicationLifetime.ApplicationStopping.Register(OnShutdown);

    loggerFactory.AddConsole();

    if (env.IsDevelopment())
    {
        app.UseDeveloperExceptionPage();
    }

    // Serve wwwroot as root
    app.UseFileServer();

    // Serve /node_modules as a separate root (for packages that use other npm modules client side)
    app.UseFileServer(new FileServerOptions()
    {
        // Set root of file server (remember not wwwroot!)
        FileProvider = new PhysicalFileProvider(Path.Combine(env.ContentRootPath, "node_modules")),
        // Only react to requests that match this path
        RequestPath = "/node_modules"
    });
}