Constraints on usernames?
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Not in this case.
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The URL name is unique and it has no default value. You must go into your profile and set it yourself, but you can still change it as many times as you want.
And really, it's just a redirect under the hood to the actual UUID for your profile.
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If you really want something interesting: use the date&time the record is inserted into the DB as the surrogate key.
?
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@blakeyrat pulling out the Appeal To Authority
doesn't mean he's wrong
@ben_lubar, why not go with the Twitter rules?
[a-zA-Z][a-zA-Z0-9_]*
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𝕱𝖗𝖔𝖘𝖙𝕮𝖆𝖙 is a perfectly good username.
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I wonder ifI ͚̝̏ͮ̅̾l̮̲͛ͥ͋̍͑̐o̯̞̰̯̅̈̿ͅv̜͈͈͐̍̂͑e̦̜̼̫͚͛̈́ U̥̤̼͈͔̖̠̲͊ͨͭͤ̊ͥ̚Ň͓͓̌̾̂̔̅̿ͬͭI̳̮̺̞̮̭̙͒̇̽C̫̩͙͎̦̯͐ͯ̎̀̊̉̒ͅO̺̝̰̰̔ͩͪ̍ͩ̒D̪̼̝̙͖͈̱̂ͭ̊̔E̟͐̃ͦ͌͊ͅ
is a valid username?