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

public class Test
{
	public static void Main()
	{
		var strs = new List<string> { "abc", "ab .c", "ab123,cd2,  ,,%&$§56"};
        foreach (var input in strs) {
        	var output = Regex.Matches(input, @"[\p{L}\p{N}]+").Cast<Match>().Select(x => x.Value);
        	Console.WriteLine($"--- Checking {input} ---");
        	Console.WriteLine(string.Join("; ", output));
        }
	}
}