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public string GetFirstImg(string str)
{
//¼ÙÉèstrµÄֵΪ£º <p>dfsgdgdfgdgdf <img width="200" height="150" alt="" src="/upfile/image/Desert.jpg" /> </p>
// <p>dfdfgdfgdgdfgdg <img width="200" height="150" alt="" src="/upfile/image/Tulips.jpg" />dfgdfgdfgdgd </p>

//ÒªÇ󷵻صÚÒ»ÕÅͼƬµÄsrcÊôÐÔ£¬ÉÏÃæÄǸöÓ¦¸ÃÊÇ /upfile/image/Desert.jpg
}

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¸øimg¼Ó¸öid,È»ºódocument.getElementById("imgid").src

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System.Text.RegularExpressions.Regex  reg=new  System.Text.RegularExpressions.Regex(@" <img[^>].*?src=""(? <src>[^""].*)""[^>].*?>",System.Text.RegularExpressions.RegexOptions.IgnoreCase); 
System.Text.RegularExpressions.MatchCollection mc = reg.Matches(str);
for (int i = 0; i < m.Count; i++)
{
    Console.Write(m[i].Groups["src"].ToString());
}

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List <string> lst= new List <string>();
Regex reg = new Regex(@" <img\s+[^>]*\s*src\s*=\s*(['""]?)(? <url>.+)['""]?[*>",RegexOptions.IgnoreCase);
MatchCollection mc = reg.Matches("");
foreach(Match m in mc)
{
    lst.Add(m.Groups["src"].Value);
}

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