Make Slug - Makes a url-friendly "slug" Input: "St. Patrick's Day: Awësöme tö-dö's" Output: "st-patricks-day-awesome-to-dos"

slug.cs

//Input: "St. Patrick's Day: Awësöme tö-dö's"
//Output: "st-patricks-day-awesome-to-dos"
public static string MakeSlug(string url) 
{
    url = RemoveDiacritics(url.ToLowerInvariant());
    url = Regex.Replace(url, @"[^a-z0-9\-\s]", "");
    url = Regex.Replace(url, @"\s+", "-");
    url = Regex.Replace(url, @"\-+", "-").Trim('-');
	
    return url;
}

/// See: http://www.siao2.com/2007/05/14/2629747.aspx
private static string RemoveDiacritics(string stIn)
{
    string stFormD = stIn.Normalize(NormalizationForm.FormD);
    StringBuilder sb = new StringBuilder();

    for (int ich = 0; ich < stFormD.Length; ich++)
    {
        System.Globalization.UnicodeCategory uc = System.Globalization.CharUnicodeInfo.GetUnicodeCategory(stFormD[ich]);
        if (uc != System.Globalization.UnicodeCategory.NonSpacingMark)
        {
            sb.Append(stFormD[ich]);
        }
    }

    return (sb.ToString().Normalize(NormalizationForm.FormC));
}