<p></p>
<p>The main validation that is applied to usernames, other than length constraints and disallowing leading and trailing whitespace, is this: <a href="https://github.com/openstreetmap/openstreetmap-website/blob/master/app/validators/characters_validator.rb">https://github.com/openstreetmap/openstreetmap-website/blob/master/app/validators/characters_validator.rb</a></p>

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