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string s = @"[DataClassData]
DataClassPath=cc
DataClass=bb
[DataClassSettings]
DataClassPath=aa
DataClass=bb
[DataClassData]
DataClassPath=dd
DataClass=bb";
Match match = Regex.Match(s, @"(?is)\[DataClassSettings\]\s*.*?(DataClassPath=[^\r\n]+)");
Console.Write(match.Groups[1].Value);