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

public class Test
{
	public static void Main()
	{
		string s = @"some description ` match these_words th_is_wor ` or `THIS_WOR thi_sqw` a `word_snake`";
		string pattern = @"`(?:[\p{Zs}\t]*(\w+)[\p{Zs}\t]*)+`";
	    foreach (Match m in Regex.Matches(s, pattern))
    	{
	        string[] result = m.Groups[1].Captures.Select(c => c.Value).ToArray();
	        Console.WriteLine(String.Join(',', result));
    	}
	}
}