Having an issue with MapPageRoute in Vb.Net Global.asax

I am having an issue where the I am trying to use some Regular Expression in a constraint. The issue is it is evaluating the Regex as a string, and throwing an error. "C开发者_运维技巧annot convert String '\d+' to long"

Here is the code .MapPageRoute("Parts", "{PartName}/{Part}/", "~/Inventory/Default.aspx", Nothing, New RouteValueDictionary(New With {.Part = "\d+"}))

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I have pretty much the exact code and it works fine for me.

routes.MapPageRoute("CMS", "{folderID}/{pageTitle}", "~/index.aspx", False, Nothing, New RouteValueDictionary(New With {.folderID = "\d+"}))

I'm using .net 4.0 - perhaps you have 3.5 sp1?