.NET Core Routing for unwanted folder or extension - Stack Overflow

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I am implementing the routing in Core 8.0 project. First goal is to redirect any .aspx page request to the latest common page. I have placed these combinations to address all possibilities. it is working fine.

    [HttpGet("/{filename}.aspx")]
    [HttpGet("/{folder1?}/{filename}.aspx")]
    [HttpGet("/{folder1?}/{folder2?}/{filename}.aspx")]
    [HttpGet("/{folder1?}/{folder2}/{folder3}/{filename}.aspx")]
    [HttpGet("/{folder1?}/{folder2}/{folder3}/{folder4}/{filename}.aspx")]
    [HttpGet("/{folder1?}/{folder2}/{folder3}/{folder4}/{folder5}/{filename}.aspx")]
    [HttpGet("/{folder1?}/{folder2}/{folder3}/{folder4}/{folder5}/{folder6}/{filename}.aspx")]
    [HttpGet("/{folder1?}/{folder2?}/{folder3?}/{folder4?}/{folder5?}/{folder6?}/{folder7?}/{filename}.aspx")]

But now the challenge is, I want it to be extended for various folders too, as they are no more available. So if a url is starting from certain folder, I need to redirect them.

One option is to repeat the above code for each folder, but it will be too much to manage... So I thougt of experiementing with RegEx as shown below, but they are not working in all scenarios.

For example, I want any url starting with portal, should get redirect to the page.

    [HttpGet("{url:regex(.*)}.aspx")]

    [HttpGet("/Site/{url:regex(.*)}")]
    [HttpGet("/portal/{url:regex(.*)}")]
    [HttpGet("/goBig/{url:regex(*)}")]
    [HttpGet("/Go-Big/{url:regex(.*)}")]

I have placed these code in a method under controller. I am decorating HttpGet for this method.

    public IActionResult NotReadyPages()
    {
        return RedirectToAction("CatamaransForSale", "Boat");
    }

Please advise, if this is the correct route, or would you recommend better way to maintain these, I could have many unwanted folders to be redicted because of old reference in the Google Console.

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