using System.ComponentModel.DataAnnotations;
using System.Text.RegularExpressions;
public static void Main()
const string strRegex = @"^\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$";
var re = new Regex(strRegex);
Console.WriteLine(System.IO.Path.Combine("\\\\prod-fileserver.infotrack.co.uk\\infotrack-fileserver-uk-live\\Attachment", "2258000", "2258836",
"C:\\Users\\JayWong\\Zhong Lun Law\\OneDrive - Zhong Lun Law\\Desktop\\completion\\4501 Pan Peninsula\\Title Pack\\Official Copy (Title Plan) - AGL429927 - Flat 1, Level 45, 3 Pan Peninsula Square E14 9HR.PDF"));