获取文章中的图片地址

public static string GetImageUrlFromArticle(string articleContent)
{
    Regex r = new Regex(@"<IMG[^>]+src=\s*(?:\'(?<src>[^\']+)\'|""(?<src>[^""]+)""|(?<src>[^>\s]+))\s*[^>]*>", RegexOptions.IgnoreCase);
    MatchCollection mc = r.Matches(articleContent);
    if (mc.Count != 0)
    {
        return mc[0].Groups["src"].Value.ToLower();
    }
    else
    {
        return "";
    }
} 

　　当然是图片地址数组，然后下载图片并生成地址进行替换