using System;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        Console.WriteLine(IsCheckID("H720067385"));

    }

    public static bool IsCheckID(string value_){

        return Regex.IsMatch(value_, @"^[a-zA-Z]{1}[a-zA-Z8-9]{1}[0-9]{8}$");

    }

}

​