I think you can use whatever you want. The point is just to drop a quick marker that you can find later, and not interrupt your flow.

Ah, never mind. A slight refinement needed here.

AP style only spells out one through nine. 10 and above are written as numerals. So, you'd get 10 tags, not 100.

I think the regex would be: /(?<!\d)\d{1}(?!\d)/