using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text.RegularExpressions;
 
public class Test
{
	public static void Main()
	{
		var filter = @"abc = 'def' and size = '1 x(3"" x 5"")' and (name='Sam O\'neal')";
		var pattern = @"('[^'\\]*(?:\\.[^'\\]*)*'|<=|>=|!=|=|>|<|\)|\(|\s+)";
		var tokens = Regex.Split(filter, pattern).Where(x => !string.IsNullOrWhiteSpace(x));
        foreach (var tok in tokens)
        	Console.WriteLine(tok);
	}
}

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