using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text.RegularExpressions;
public class Test
{
public static void Main()
{
var text = "ABC_BC_BE08_C1000004_0124";
var result = Regex.Matches(text, @"(?<=^(?:[^_]*_){2,})[^_]+").Cast<Match>().Select(x => x.Value);
foreach (var s in result)
Console.WriteLine(s);
}
}
dXNpbmcgU3lzdGVtOwp1c2luZyBTeXN0ZW0uQ29sbGVjdGlvbnMuR2VuZXJpYzsKdXNpbmcgU3lzdGVtLklPOwp1c2luZyBTeXN0ZW0uTGlucTsKdXNpbmcgU3lzdGVtLlRleHQuUmVndWxhckV4cHJlc3Npb25zOwoKcHVibGljIGNsYXNzIFRlc3QKewoJcHVibGljIHN0YXRpYyB2b2lkIE1haW4oKQoJewoJCXZhciB0ZXh0ID0gIkFCQ19CQ19CRTA4X0MxMDAwMDA0XzAxMjQiOwoJCXZhciByZXN1bHQgPSBSZWdleC5NYXRjaGVzKHRleHQsIEAiKD88PV4oPzpbXl9dKl8pezIsfSlbXl9dKyIpLkNhc3Q8TWF0Y2g+KCkuU2VsZWN0KHggPT4geC5WYWx1ZSk7CiAgICAJZm9yZWFjaCAodmFyIHMgaW4gcmVzdWx0KQogICAgICAgIAlDb25zb2xlLldyaXRlTGluZShzKTsKCX0KfQ==