using System;

​

using System.Text.RegularExpressions;

​

​

public class Program

{

    public static void Main()

    {

        string input = "BUILD_ID=\"RS-emmc-image-20230103152043\"";

​

        // Define a regular expression pattern to match the date

        string pattern = @"(\d{4})(\d{2})(\d{2})";

​

        // Use the Regex class to match the pattern in the input string

        Match match = Regex.Match(input, pattern);

​

        // Extract the year, month and day from the match

        string year = match.Groups[1].Value;

        string month = match.Groups[2].Value;

        string day = match.Groups[3].Value;

​

        // Create a date string in the format "yyyy-MM-dd"

        string date = $"{year}-{month}-{day}";

​

        // Convert the date string to a DateTime object

        DateTime dateTime = DateTime.Parse(date);

​

        Console.WriteLine(dateTime.ToString("yyyy-MM-dd"));

    }

}