Username:
May contain only Latin letters (a–z, case-insensitive), numbers (0–9), and certain other symbols
Must be at least 2 and at most 32 characters long
Must comply with standards of decency and generally accepted morality
Must not be an email or web address, nor clearly resemble one
The username must not contain:
Symbols: @, &, ', <, >
Multiple consecutive underscores (e.g., "__")
At the beginning: underscore "", hyphen "-", or dot "."
The word "okidoki"
Profane or offensive words