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 "";
}
}