//取图片
MatchCollection matchs = Regex.Matches(AskText,@"<imgs[^> ]*src=([""']*)(?<src>[^'""]*)1[^>]*>", RegexOptions.IgnoreCase);
List<string> PicArray=new List<string>();
foreach (Match m in matchs)
{
PicArray.Add(m.Groups["src"].Value);
}
//取汉字
ListAskText = Regex.Replace(AskText, @"[^u4e00-u9fa5]", "");