url mappings with or without trailing slash

I use UrlMappings in web.config. Now, I must have 2 url entries to make the mapping work with both the trailing backslash and without. Like this:

    <urlMappings>
      <clear />
      <add url="~/app" mappedUrl="~/Templates/Sections/Common/Article.aspx?id=981" />
      <add url="~/app/" mappedUrl="~/Templates/Sections/Common/Article.aspx?id=981" />
    </urlMappings>

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Is it possible to make the url (~/app) work with or without trailing slash, in one line of code? Mabye by using wildcard or something for the "~/app" url..?