[SalesForce] How to count the commas in text field

Here is my solution

    trigger UpdateCount on my_object__c (after insert,after update) {

    list<Id> lpIdList = new list<Id>();

        for(my_object__c  lp : trigger.new){

            if(trigger.isInsert){
              if((lp.my_long_text_area__c != null)){
              lpIdList.add(lp.Id);
             }
            }

            if(trigger.isUpdate){
               if((Trigger.oldMap.get(lp.Id).my_long_text_area__c != Trigger.newMap.get(lp.Id).my_long_text_area__c) && (Trigger.newMap.get(lp.Id).my_long_text_area__c != null)){
                 lpIdList.add(lp.Id);
              }
            }
        }

     list<my_object__c> lpList = [select id,Line_Count__c,my_long_text_area__c from my_object__c where id in:lpIdList];

    for(LNP_Request__c lp:lpList){
         list<String> totalLines =  lp.my_long_text_area__c.split('\n');
         lp.Line_Count__c = totalLines.size();
      }

    if(lpList.size()>0){
       update lpList; 
    }

  }

You can take help from SUBSTITUTE(text, old_text, new_text) function . for example

TRIM( SUBSTITUTE(Target Kindergarten 1, Target, '')); it will give you

Kindergarten 1 This code will only work if you have fixed text value Target.