using System;
using System.Text.RegularExpressions;

public class Test
{
	public static void Main()
	{
		var old_data = "data_for_section_1,data_for_section_2,IDs|in|section|3,section_4_part_1, section_4_part_2, section_4_part_3,data_for_section_5";
		var data = Regex.Split(old_data, @",(?!\s)");
		
		foreach (var d in data) {
			Console.WriteLine(d);
		}
	}
}