How do I go about using REGEXREPLACE to insert commas into values in Google Sheets? Example:
cell A1 = 1234567890
expected output in B1 = 1,234,567,890
edit: The intention would be so that the user would not need to format anything themselves. This issue is from a template I'm doing up, sample sheet here - https://docs.google.com/spreadsheets/d/1n-KXqcSpx_DpvrOv9A4UsKn1amGGEUCpyzWWDphWdJY/edit?usp=sharing