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string img = " <div> adfa<a id=\"2\" src=\"2211.jpg\" > <img id=\"xxx\" src=\"adfas.jpg\" /><a id=\"3333\" src=\"adfas.jpg\" >";
Regex reg = new Regex(@" id=""xxx"".*?src=""(.+?)""(?=\s+\/\>)");
string src= reg.Match(img).Groups[1].Value;
string img = " <div> adfa<a id=\"2\" src=\"2211.jpg\" > <a id=\"xxx\" src=\"adfas.jpg\" ><a id=\"3333\" src=\"adfas.jpg\" >";
Regex reg = new Regex(@" id=""xxx"".*?src=""(.+?)""(?=\s\>)");
string src= reg.Match(img).Groups[1].Value;