Update only some fields in docx file

FieldUpdater.cs

using System;
using System.Collections.Generic;
using Microsoft.Office.Interop.Word;
using System.Runtime.InteropServices;

namespace FieldUpdater
{


    class Program
    {
        static void Main(string[] args)
        {
            string filePathstr = @"C:\Test.docx";
            
            //List<string> path = new List<string>(args);
            //string filePathstr = string.Join(" ", path.ToArray());

            try
            {
                Application ap = new Application();
                Document document = ap.Documents.Open(filePathstr);

                List<string> list = new List<string>(1000);

                foreach (Field field in document.Fields)
                {
                    try
                    {
                        string text = field.Code.Text;
                        var value = field.Result.Text;

                        if (text.Contains("REF _Ref")) // && !(value.Contains(".")
                        {
                            if ((value != "") && (value != null))
                            {
                                // I wanted to update only links with names 1-99
                                if (value.Length < 3)  // value.Contains(".") 
                                {
                                    field.Update();
                                    //list.Add(text + " " + value);
                                }
                            }
                        }

                        
                    } catch (COMException ex) {

                    }
                }


                document.Save();
                document.Close();

            }
            catch (NullReferenceException)
            {
                System.Console.WriteLine("A valid file was not selected.");
            }
        }
    }
}

Word replace latin symbols with cursive

([a-z]{1;10})
\1