start counting number of line in input field after a specific line and read it

Hello, I'm new in unity and i'm making a game to test programming skill something like codecombat and i have a question please i want to start counting the lines in a input field after a specific line for example i have a input field that have this lines
Hero.left(2)
Hero.right(2)
REPEAT
{
Hero.Down(3)
}
i want it if he find this word "REPEAT" to start counting the number of line from "{" to "}" (counting the number of lines inside the " { } " and read it ).
this is my all the code in the script that i'm using

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.UI;
 
 public class GameManager1_4 : MonoBehaviour
 {
     public InputField mainInputField;
     //public float speed;
 
     public GameObject Player;
     public Button Click_me;
 
     public float smoothing = 1f;
     public Transform TargetRight;
     public Transform TargetRight1;
     public Transform TargetRight2;
     public Transform TargetDown;
     public Transform TargetDown1;
     public Transform TargetDown2;
 
     int count;
     public float targetTime = 2f;
     private readonly Queue<Transform> _commands = new Queue<Transform>();
     // Start is called before the first frame update
     void Update()
     {
         targetTime -= Time.deltaTime;
         if (targetTime <= 0.0f)
         {
             targetTime = 0f;
             timerEnded();
         }
 
     }
     public void SubmitName()
     {
         int countligne = 0;
         var lines = mainInputField.text.Split('\n');
       //  mainInputField.text = "";
         foreach (var line in lines)
         {
             countligne++;
           
             switch (line.ToUpper())
             {
                 case "REPEAT(3)":
                     for (int i = 0; i < 3; i++)
                     {
                         var lines_reapeat = mainInputField.text.Split('\n');
                         Debug.Log(lines_reapeat);
                         foreach (var line_rep in lines_reapeat)
                         {
                             switch (line_rep.ToUpper())
                             {
                                 case "DOWN(1)":
                                     // adds a new item to the end of the Queue
                                     _commands.Enqueue(TargetDown);
                                     break;
                                 case "RIGHT(1)":
                                     _commands.Enqueue(TargetRight);
                                     break;
                                 case "}":
 
                                     break;
                             }
                         }
                     }
                     //i want this line to start calculation from "{" to "}" and run the right donw command inside the "{" "}" but it's always calculating the same inputfieald 
                       
                    
                     break;
                 case "DOWN(1)":
                     // adds a new item to the end of the Queue
                     _commands.Enqueue(TargetDown);
                     break;
                 case "RIGHT(1)":
                     _commands.Enqueue(TargetRight);
                     break;
             }
 
 
 
 
 
 
         }
         StartCoroutine(WorkCommands());
         mainInputField.text = "";
     }
 
     private IEnumerator WorkCommands()
     {
         // block input
         Click_me.interactable = false;
 
         // run this routine until all commands are handled
         while (_commands.Count > 0)
         {
             // returns the first element and at the same time removes it from the queue
             var target = _commands.Dequeue();
 
             // you can simply yield another IEnumerator
             // this makes it execute and at the same time waits until it finishes
             yield return MovementCoroutine(target);
         }
 
         // when done allow input again
         Click_me.interactable = true;
         CountNumbre();
     }
     // Update is called once per frame
 
 
 
     private IEnumerator MovementCoroutine(Transform target)
     {
         var startPos = Player.transform.position;
         var targetPos = target.position;
        
         var timePassed = 0f;
 
         do
             {
                 var lerpFactor = Mathf.SmoothStep(0, 1, timePassed / smoothing);
                 Player.transform.position = Vector3.Lerp(startPos, targetPos, lerpFactor);
 
                 timePassed += Time.deltaTime;
 
                 yield return null;
             }
             while (timePassed < smoothing);
             Player.transform.position = targetPos;
 
         
 
 
         // just to be sure there is no over or undershooting
         // in the end set the correct target position
 
     }
     void CountNumbre()
     {
         count++;
 
         var startPos = Player.transform.position;
      
         var timePassed = 0f;
       
             Debug.Log("Nombre de fois" + count);
 
         if (count >= 3)
         {
             Click_me.interactable = false;
 
             Debug.Log("You finish all your chance");
         }
     }
     void timerEnded()
     {
         if (Player.transform.position == TargetRight2.position)
         {
             Debug.Log("Processing Speed = 100");
             Application.Quit();
         }
         else
         {
             Debug.Log("Processing Speed = 0");
         }
     }
 }
 

and this is the function i use in splitting lines and read what the player has been write

 public void SubmitName()
     {
         int countligne = 0;
         var lines = mainInputField.text.Split('\n');
       //  mainInputField.text = "";
         foreach (var line in lines)
         {
             countligne++;
           
             switch (line.ToUpper())
             {
                 case "REPEAT(3)":
                     for (int i = 0; i < 3; i++)
                     { //i want this line to start calculation from "{" to "}" and run the right donw command inside the "{" "}" but it's always calculating the same inputfieald 
                         var lines_reapeat = mainInputField.text.Split('\n');
                         Debug.Log(lines_reapeat);
                         foreach (var line_rep in lines_reapeat)
                         {
                             switch (line_rep.ToUpper())
                             {
                                 case "DOWN(1)":
                                     // adds a new item to the end of the Queue
                                     _commands.Enqueue(TargetDown);
                                     break;
                                 case "RIGHT(1)":
                                     _commands.Enqueue(TargetRight);
                                     break;
                                 case "}":
 
                                     break;
                             }
                         }
                     }
                    
                       
                    
                     break;
                 case "DOWN(1)":
                     // adds a new item to the end of the Queue
                     _commands.Enqueue(TargetDown);
                     break;
                 case "RIGHT(1)":
                     _commands.Enqueue(TargetRight);
                     break;
             }
 
 
 
 
 
 
         }
         StartCoroutine(WorkCommands());
         mainInputField.text = "";
     }

please anyone can help me in this i'm stuck and sorry for my English.