I'd like to suggest that you include the backslash in your list of metacharacters at the begining of Chapter 2.

You discuss using the backslash to escape the special meaning of metacharacters but don't mention that you need to escape a backslash itself to match it.

Very good job so far! :-)

bbfu
Seasons don't fear The Reaper.
Nor do the wind, the sun, and the rain.
We can be like they are.