ASP.NET 过滤html中的图片与换行

using System.Text.RegularExpressions; 

public static string replaceImgUrl(string html)
    {
        if (html == null)
            return "";
        Regex regex = new Regex(@"\<IMG[^\>]+\>", RegexOptions.IgnoreCase);
        html = regex.Replace(html, "");

        Regex regex1 = new Regex("<(.|\n)+?>", RegexOptions.IgnoreCase);
        html = regex1.Replace(html, "");
        return html;
    }