Allowed characters within the first 5 characters of a username?

HS usernames have a system where the first 5 characters of a username are limited to certain characters, and then after that, the range is much wider.
My question is, what are all allowed characters within the first 5 characters of a username? Please don’t just respond with something vague, I want a genuine list.
You’d think it would be letters, numbers, and underscore (_) but clearly that’s not the case since you can create usernames with dots (.), dashes (-), and even spaces ( ).
I also know that this limitation didn’t exist at one time, and I know this because accounts like $ exist, and $ isn’t an allowed character within the first 5 characters (I tested it). There are many more accounts like this, and it would take forever to find and list all of them.

(This is the right category, right?)

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I think it is

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The $ account was probably created before the limitations were added.

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I know. I was just saying that the limitation probably didn’t always exist because that account does exist

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i know * is allowed

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