URL Routing: Handling Spaces and Illegal Characters When Creating Friendly URLs

/article/1/Some_Article_Title_Here
/article/1/Section/5/Section_Title_Here
/section/19023/Section_Title_here  ( == above link )

http://www.example.com/x/category-name/subcat-name/article-name/348254863

Route r = new Route("{country}/{lang}/Article/{id}/{title}/", new NFRouteHandler("OneArticle"));
Route r2 = new Route("{country}/{lang}/Section/{id}-{subid}/{title}/", new NFRouteHandler("ArticlesInSubcategory"));
Route r3 = new Route("{country}/{lang}/Section/{id}/{title}/", new NFRouteHandler("ArticlesByCategory"));

private static string anglicized(this string urlpart) {
        string before = "àÀâÂäÄáÁéÉèÈêÊëËìÌîÎïÏòÒôÔöÖùÙûÛüÜçÇ’ñ";
        string  after = "aAaAaAaAeEeEeEeEiIiIiIoOoOoOuUuUuUcC'n";

        string cleaned = urlpart;

        for (int i = 0; i < avantConversion.Length; i++ ) {

            cleaned = Regex.Replace(urlpart, before[i].ToString(), after[i].ToString());
        }

        return cleaned;

        // Here's some for Spanish : ÁÉÍÑÓÚÜ¡¿áéíñóúü"

}

string articleTitle = "My Article about café and the letters àâäá";
string cleaned = articleTitle.anglicized();

// replace spaces with dashes
cleaned = Regex.Replace( cleaned, "[^A-Za-z0-9- ]", "");

// strip all illegal characters like punctuation
cleaned = Regex.Replace( cleaned, " +", "-").ToLower();

// returns "my-article-about-cafe-and-the-letters-aaaa"