I have set up an email service and Apex class that handles inbound emails and creates a new task with the details from the email. The task is then related to a custom object based on the subject line of the email matching a custom field on the custom object record. This is working fine at the moment but I need to tweek the criteria the check if the subject of the email contains the value of the custom field. At the moment it is checking if the subject = the field. I need to check if it contains rather than =.

Custom object = Request
Custom field to check against email subject = Test

Here is the Apex class

global class CreateTaskEmailExample1 implements Messaging.InboundEmailHandler {
 
  global Messaging.InboundEmailResult handleInboundEmail(Messaging.inboundEmail email, 
                                                       Messaging.InboundEnvelope env){
 
    // Create an InboundEmailResult object for returning the result of the 
    // Apex Email Service
    Messaging.InboundEmailResult result = new Messaging.InboundEmailResult();
  
    String myPlainText= '';
    
    // Add the email plain text into the local variable 
    myPlainText = email.plainTextBody;
   
    // New Task object to be created
    Task[] newTask = new Task[0];
   
    // Try to look up any Request based on the email subject
    
    try {
      Request__c vCon = [SELECT Id, Name, Number__c, Test__c
        FROM Request__c 
        WHERE Test__c =:email.subject
        LIMIT 1];
      
      // Add a new Task to the Request record we just found above.
      newTask.add(new Task(Description =  myPlainText,
           Priority = 'Normal',
           Status = 'Inbound Email',
           Subject = email.subject,
           IsReminderSet = true,
           ReminderDateTime = System.now()+1,
           WhatId =  vCon.Id));
     
     // Insert the new Task 
     insert newTask;    
     
     System.debug('New Task Object: ' + newTask );   
    }
    // If an exception occurs when the query accesses 
    // the Request record, a QueryException is called.
    // The exception is written to the Apex debug log.
   catch (QueryException e) {
       System.debug('Query Issue: ' + e);
   }
   
   // Set the result to true. No need to send an email back to the user 
   // with an error message
   result.success = true;
   
   // Return the result for the Apex Email Service
   return result;
  }
}