Hi, I am looking for the correct function to "scrape" the 1st 5 digits of the billing postal code to use in my exisitng apex trigger to populate a lookup filed of "PostalCode" on my account records. Below is the current working apex trigger however it only fires when the postal code is entered as a 5 digit code "which matches the custom object Name field of Postal Code. I want users to be able to ender the 9 digit postal codes in the billing postal code field and still be able to have this trigger work in taking the 1st 5 digits to use for the list. Thoughts? 

trigger updatepostalcode on Account (before insert, before update) {
    List<String> BillingPostalCodes = new List<String>();
   
    for (Account a:Trigger.new){
        BillingPostalCodes.add(a.BillingPostalCode);
    }

    List <Postal_Code__c> PostalCodeList = [Select ID, Name from Postal_Code__c where Name in :BillingPostalCodes];

    for (Integer i = 0; i <Trigger.new.size(); i++){
        if (PostalCodeList.size() > 0 && Trigger.new[i].BillingPostalCode !=null){
                        for (Postal_Code__c z:PostalCodeList){
                if (Trigger.new[i].BillingPostalCode == z.name){
                        Trigger.new[i].Postal_Code__c = z.ID;
                                }
                        }
        }
        else{
        Trigger.new[i].Postal_Code__c = null;
        }
       
    }
}

Hi there,

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Thanks !