string str = "<img src=image/ad1.gif width=\"128\" height=\"36\"/><img src='image/ad2.gif' width=\"128\" height=\"36\" />";
Regex rg = new Regex(@"<img[\s]+src[\s]*=[\s]*((['""]([^ '""]*)[\'""])|([^\s]*))");
MatchCollection cols = rg.Matches(str);
foreach(Match ch in cols)
{
Console.WriteLine( ch.Groups[1].Value);
}
Console.ReadLine();
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