As Jimi Oke details out, it won't issue what letter the word commences with, but what sound it starts off with. Considering the fact that "regular" begins which has a 'y' audio, it should just take 'a' rather than 'an'. Jeff MorrowJeff Morrow 32.3k2626 silver badges5959 bronze badges 8 "Inside https://petskyonline.com/blog/why-tofu-cat-litter-is-gaining-popularity-in-the-uae/