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My gmail/github usernames are the same as my HN username.
[ my public key: https://keybase.io/whitespace; my proof: https://keybase.io/whitespace/sigs/7n2v9-_GjHVZDiDsnzuqllzU_E7RYpr18hej2JZiG40 ]
I assume it's more complex than [number of valid characters]^[browser character limit]. Networking equipment, browsers, archaic protocols, etc. all place limitations/requirements on this number.
Feel free to simplify it (ex: a single domain) or make it more complex as necessary. For consistency's sake let's assume I use Chromium stable on 2024-01-01 00:00:01 UTC and the request actually goes out onto the internet (so other hardware touches it)