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

public class Test
{
	public static void Main()
	{
			var str="15-16-00-014716 AND15- [ ] (5) Description of 16-00-014715"; 
			var a= Regex.Replace(str, @"\s+\[.*?(?=\b\d+(?:-|$))", ""); 
        	Console.WriteLine(a);
        	
        	var str1="15-16-00-014716 AND15- [ ] (5) Description of 1600014715"; 
			var a1= Regex.Replace(str1, @"\s+\[.*?(?=\b\d+(?:-|$))", ""); 
        	Console.WriteLine(a1);
	}
}