I am attempting to match paragraph numbers inside my block of text. Given the following sentence:

> 
> Refer to paragraph C.2.1a.5 for examples.
> 
> 
> 

I would like to match the word `C.2.1a.5`.

My current code like so:

```
([0-9a-zA-Z]{1,2}\.)

```

Only matches `C.2.1a.` and `es.`, which is not what I want. Is there a way to match the full `C.2.1a.5` and not match `es.`?

<https://regex101.com/r/cO8lqs/13723>

I have attempted to use `^` and `$`, but doing so returns no matches.