What are the Discourse rules for usernames?

pfaffman · August 10, 2020, 4:24pm

An easy way to answer your question empirically is to go to try.discourse.com and see what usernames you can create there!

If you want to know exactly, you can look at the code:

github.com/discourse/discourse

app/models/username_validator.rb

main

# frozen_string_literal: true

class UsernameValidator
  # Public: Perform the validation of a field in a given object
  # it adds the errors (if any) to the object that we're giving as parameter
  #
  # object - Object in which we're performing the validation
  # field_name - name of the field that we're validating
  #
  # Example: UsernameValidator.perform_validation(user, 'name')
  def self.perform_validation(object, field_name, opts = {})
    validator = UsernameValidator.new(object.public_send(field_name), object:, **opts)
    unless validator.valid_format?
      validator.errors.each { |e| object.errors.add(field_name.to_sym, e) }
    end
  end

  def initialize(username, skip_length_validation: false, object: nil)
    @username = username&.unicode_normalize
    @skip_length_validation = skip_length_validation

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What are the Discourse rules for usernames?

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