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

public class Test
{
	public static void Main()
	{
		var text = "attr one = one two three attr two = 3";
		var dct = Regex.Matches(text, @"\battr\s+(?<name>\S*)\s+=\s+(?<value>.*?)(?=\s+attr\s|\z)")
		    .Cast<Match>()
		    .ToDictionary(p => p.Groups["name"].Value, p => p.Groups["value"].Value); 
        foreach (var kvp in dct)
        	Console.WriteLine("{0} -> {1}", kvp.Key, kvp.Value);
	}
}