c# HTML中提取圖片地址

public class HtmlHelper
{
/// <summary>
/// HTML中提取圖片地址
/// </summary>
public static List<string> PickupImgUrl(string html)
{
Regex regImg = new Regex(@"<img\b[^<>]*?\bsrc[\s\t\r\n]*=[\s\t\r\n]*[""']?[\s\t\r\n]*(?<imgUrl>[^\s\t\r\n""'<>]*)[^<>]*?/?[\s\t\r\n]*>", RegexOptions.IgnoreCase);
MatchCollection matches = regImg.Matches(html);
List<string> lstImg = new List<string>();

foreach (Match match in matches)
{
lstImg.Add(match.Groups["imgUrl"].Value);
}

return lstImg;
}

/// <summary>
/// HTML中提取圖片地址
/// </summary>
public static string PickupImgUrlFirst(string html)
{
List<string> lstImg = PickupImgUrl(html);

return lstImg.Count == 0 ? string.Empty : lstImg[0];
}
}