using System;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {   

        // Create a pattern for a word that starts with letter "M"  

        string pattern = @"tRaCrEnT-(?<UserId>\d+)-(?<RentId>\d+)";

        //string pattern2 = @"A\d{2}(?i:\w+)\b";

        // Create a Regex  

        Regex rg = new Regex(pattern, RegexOptions.IgnoreCase);  

​

        // Long string  

        string authors = "Mahesh Chand, TracRent, Raj Kumar, Mike Gold, Allen O'Neill, Marshal Troll r sit TracRent-14-100 amet";  

        // Get all matches  

        MatchCollection matchedAuthors = rg.Matches(authors);  

        Console.WriteLine(matchedAuthors.Count);

        // Print all matched authors  

        for (int count = 0; count < matchedAuthors.Count; count++) {

            Console.WriteLine("TracRent: " + matchedAuthors[count].Groups[0]);

            Console.WriteLine("UserId: " + matchedAuthors[count].Groups["UserId"]);

            Console.WriteLine("RentId: " + matchedAuthors[count].Groups["RentId"]);

            Console.WriteLine(matchedAuthors[count].Value); 

        }

    }

}