清除word格式的C#代碼

static void Main(string[] args)
{
    if (args.Length == 0 || String.IsNullOrEmpty(args[0]))
    {
        Console.WriteLine("No filename provided.");
        return;
    }


string filepath = args[0];
if (Path.GetFileName(filepath) == args[0])
{
    filepath = Path.Combine(Environment.CurrentDirectory, filepath);
}
if (!File.Exists(args[0]))
{
    Console.WriteLine("File doesn't exist.");
}

string html = File.ReadAllText(filepath);
Console.WriteLine("input html is "   html.Length   " chars");
html = CleanWordHtml(html);
html = FixEntities(html);           
filepath = Path.GetFileNameWithoutExtension(filepath)   ".modified.htm";           
File.WriteAllText(filepath, html);
Console.WriteLine("cleaned html is "   html.Length   " chars");

}
static string CleanWordHtml(string html)
{
    StringCollection sc = new StringCollection();
    // get rid of unnecessary tag spans (comments and title)
    sc.Add(@"<!--(w|W) ?-->");
    sc.Add(@"<title>(w|W) ?</title>");
    // Get rid of classes and styles
    sc.Add(@"s?class=w ");
    sc.Add(@"s style='[^'] '");
    // Get rid of unnecessary tags
    sc.Add(
    @"<(meta|link|/?o:|/?style|/?div|/?std|/?head|/?html|body|/?body|/?span|![)[^>]*?>");
    // Get rid of empty paragraph tags
    sc.Add(@"(<[^>] >)  (</w >) ");
    // remove bizarre v: element attached to <img> tag
    sc.Add(@"s v:w =""[^""] """);
    // remove extra lines
    sc.Add(@"(
){2,}");
    foreach (string s in sc)
    {
        html = Regex.Replace(html, s, "", RegexOptions.IgnoreCase);
    }
    return html;
}
static string FixEntities(string html)
{
    NamueCollection nvc = new NamueCollection();
    nvc.Add("“", "“");
    nvc.Add("”", "”");
    nvc.Add("?", "—");
    foreach (string key in nvc.Keys)
    {
        html = html.Replace(key, nvc[key]);
    }
    return html;
}</pre>