using System;

using System.Text.RegularExpressions;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        var l = new List<string>

        {

            "DMV$101 Defective Engine AS IS - Tow Unit Previous Paintwork",

            "*A/M RADIO *DMV$102 ",

            "*CARGO PKG *DMV $103 B/R ",

            "*DMV$104 OVR 100*AS-IS;NO ARB ",

            "*MOONROOF PKG  *DMV $105 B/R 810",

            "*MOONROOF PKG  $DMV 106 B/R 665",

            "*MOONROOF PKG  $DMV $107 300B/R ",

            "*MOONROOF PKG  $DMV B/R 400",

            "$108 DMV FEES ",

            "*$109 $DMV B/R 400",

            "$12522 inoice"

        };

​

        string pattern = @"DMV\s*\$*(\d+(\.\d{1,2})?)|\$(\d+(\.\d{1,2})?)\s*[\s*\$]DMV";//|

​

        foreach (var text in l) 

        {

            var matches = Regex.Matches(text, pattern);

            foreach (Match match in matches)

            {

                if (match.Success)

                {

                    // Extracting the value from the correct capturing group

                    Console.WriteLine(!string.IsNullOrEmpty(match.Groups[1].Value) ? match.Groups[1].Value : match.Groups[3].Value);

                }

            }

        }

    }

}

​