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C# code:
(?<=")\w*\.((jpg)|(gif)|(png)|(bmp))(?=")


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((http(s)?://)?)+(((/?)+[\w-.]+(/))*)+[\w-./]+\.+(jpg|jpeg|png|ico|bmp|gif)

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<image src="aaa.jpg">

C# code:
Regex reg = new Regex(@"(?i)<img[^>]*?\ssrc=(['""]?)(?<src>[^'""\s>]+)\1[^>]*>");
MatchCollection mc = reg.Matches(yourStr);
foreach (Match m in mc)
{
richTextBox2.Text += m.Groups["src"].Value + "\n";
}


C# code:
string yourStr = @"<image src=""aaa.jpg"">»òÕß <img src=""bbb.gif"" ..>£¬";
Regex re = new Regex(@"<(image|img)\s*src=""(?<url>[^""]*\.(jpg|jpeg|png|ico|bmp|gif))""[^>]*>", RegexOptions.IgnoreCase | RegexOptions.Singleline);
MatchCollection mc


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<HTML>
<HEAD>
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