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tempStr = "<img src='xxx' style='yyy' alt='提示'>";
string Str = "<img src='xxx' style='yyy'>";
string pattern = @"(?i)(?<=<img[^>]*src=[""'][^"']*[""'][^>]*)[^>]*";
Str = Regex.Replace(Str, pattern, string.Empty);//<img src='xxx' >
string tempStr = "<img src='xxx' style='yyy'>";
string pattern = @"(?i)(?<=<img[^>]*?)style=(['""]?)[^'""]*?\1(?=[^>]*?>)";
tempStr = Regex.Replace(tempStr, pattern, string.Empty);//<img src='xxx' >