using System;
using System.IO;
using System.Text;
using System.Text.RegularExpressions;
public class Test
{
	public static void Main()
	{
		var s = "\"foo\" {{\"bar\"}}";
		var rx = new Regex(@"""(?=[^}]*(?:}})*[^}]*$)|(?<=^[^{]*(?:{{)*)""");
		Console.WriteLine(string.Format("$@\"{0}\"",rx.Replace(s,"\"\"")));
	}
}