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

public class Test
{
	public static void Main()
	{
		string text = "[\"a1\",\"a2\"]";
		Regex rg2 = new Regex(@"\A\[""[a-zA-Z0-9]+""(?:,\s*""[a-zA-Z0-9]+"")*]\z");
		Console.WriteLine(rg2.IsMatch(text));
	}
}