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var str = "ABC\r\rDEF\r\n";
//匹配规则(这个怎么写?)
string regStr = @"(?(\r\n)\r\n|(\r|\n))";
Regex r = new Regex(regStr, RegexOptions.IgnoreCase | RegexOptions.Compiled);
str = r.Replace(str, "\r\n");//ABC\r\n\r\nDEF\r\n