using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text.RegularExpressions;

public class Test
{
	public static void Main()
	{
		var input = "CurrentTime=04/24/16 09:57:23\nsan-ls-02022;ENEXRHO;1505;{call Pm_I_AuthFailToPTSF(631706,-21,?)}\nass\nbbbb\nCurrentTime=04/24/16 09:57:23\n631706\naaa\nbbb\n"; 
		var pat = @"(?m)^CurrentTime=([^\n]*)\n([^\n]*(?:\n(?!CurrentTime=)[^\n]*)*)";
    	var results = Regex.Matches(input, pat)
    			.Cast<Match>()
    			.Select(p => p.Groups[2].Value)
    			.ToList();
      	Console.WriteLine(string.Join("\n---\n", results));
	}
}