IF statement criteria?

im looking for the a specific filter criteria of any code word thats starts with the letters "ap" .... for example, when I added the new criteria I developed that's when the script stopped working, its definitely with the if statement I altered on my own in the script I tied adding a criteria for any word that starts with "ap" im looking at the tuts on unity but I haven't seen anything on limiting /checking answers against a specific criteria, / code list... for example lets say player reaches door 1 and the question comes up enter a code word that starts with "ap"... the answer would be apex3. or ape45, or apot7, but how do I code it so that the check runs and checks against any code that starts with the letters ap. and since there would be a few words that start with ap any would be accepted and allowed as the answer. ? I have found other things in the tuts but nothing on how to check question answers against specific criteria like this . I am getting error on my if statement. line I tried to put the if so that is any answer starts with "ap" it will be correct.

I haven't found anything in the tuts regarding asking specific criteria like the mentioned above

using System.Collections.Generic; using UnityEngine; using UnityEngine.UI; using System.IO;

 public class CodeWord
 {
     public HashSet<string> hash;
 }
 
 public class werda3 :  MonoBehaviour
 {
     public InputField inputField; // set this as an InputField not a GameObject
     public string wordsFile;
 
     // this will allow you to change the number of correct inputs needed (mainly for testing/debugging)
     [Range(1, 20)]
     public int correctEntriesRequired = 10; // default to 10
 
     private List<CodeWord> codeWords = new List<CodeWord>(); // create a list of CodeWords - Hashsets
     private int currentWord = 0;
 
     void Start()
     {
         for (int i = 0; i < correctEntriesRequired; i++)
         {
             // wordsFile = "C:\\Users\\new\\Pictures\\words2.txt";  // this location should be changed to a folder at the root of the drive
             // wordsFile will be words1.txt -  words10.txt
             wordsFile = "C:\\Users\\new\\Desktop\\CodeWords\\words" + (i + 1).ToString() + ".txt";
             string[] array = File.ReadAllLines( wordsFile );     // This will load a text file into an array of strings
             Debug.Log("entries in array: " + array.Length);
 
             CodeWord codeWord = new CodeWord();
 
             codeWord.hash = new HashSet<string>(array); // this converts the string array to a HashSet, could also use a dictionary for slightly better speed
             codeWords.Add(codeWord);
             Debug.Log("entries in hash for " + wordsFile + ": " + codeWord.hash.Count);
         }
 
         // the preferred method is to set the inputField in the inspector, but if it wasn't
         if ((inputField == null) &&          // if the inputField was not set in the inspector (preferred) then try and find it
             (GameObject.Find("InputField"))) // if there is an InputField game object that can be found
         {
             inputField = GameObject.Find("InputField").GetComponent <InputField>(); //This is where you assign the input field object so you can access your inputField component
         }
 
         if (inputField != null)
         {
             inputField.text = "";
             // the following adds a listener to the inputField for when the user has finished editing
             // instead of using the update method - more efficient
             inputField.onEndEdit.AddListener(delegate{LockInput(inputField);});
         }
     }
 
     // Checks if there is anything entered into the input field.
     void LockInput(InputField input)
     {
         if (input.text.Length > 0) 
         {
             if (codeWords[currentWord].hash.Contains(input.text)) // check if the HashSet contains the code they entered 
             {
                 currentWord++;
                 input.text = "";
                 if (currentWord >= correctEntriesRequired)
                 {
                     // all entries were correct now do something - for example
                     AllCodewordsCorrect();
                 }
             }
             else
             {
                 // do something if not correct - for example
                 currentWord = 0; // force restart
                 Destroy(gameObject, 1); // magic door closes - remove object
             }
         }
         else if (input.text.Length == 0) 
         {
             Debug.Log("Main Input Empty");
         }
     }
 
     void AllCodewordsCorrect()
     {
         // do something here after all entered code words are deemed valid
     }
 }