javascript正则表达式允许带引号的多个单词

I have a <textarea> where I need to validate that everything between double quotes is either latitude or longitude. I have it set up so that the word can not be used more than 3 times which is fine. But I have an error message that shows when the wrong format is used. I need the error to pop up when the user focuses out and hasn't put anything in between quotes or it's not latitude or longitude. where I need to validate th