>> I don't understand the specification.
>
> I even expressed it in Haskell-ish syntax.
>
> "Zero or more A's, followed by zero or more A's, followed by zero or
> more A's, followed by three A's."

In what way is that different from "zero or more As"?

> The fact that you can't read the link I provided is screaming out that
> you need to learn how to read that link. Not knowing even the basics of
> regular expressions is like not knowing even the basics of TCP.

Except that regular expressions are an obscure topic used almost nowhere 
except in text-mangling languages like Perl.

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