using System;

    using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("START HERE");

        var result = GetNumberOutOfString("HLONLINE.HEALTHLINK.102", "MSH3/HD.1");

        Console.WriteLine("Result is: " + result.ToString());

    }

    public static object GetNumberOutOfString(string psValue, string psField)

​

    {

​

        Match match = Regex.Match(psValue, @"\d+"); // Find first numeric sequence

​

        if (!match.Success)

​

            throw new Exception($"No Number Found in String: {psValue}\n{psField}");

​

        if (!long.TryParse(match.Value, out long result))

​

            throw new Exception($"Number Failed to Parse ('{match.Value}') in String: {psValue}");

​

        return result;

​

    }

​

}