5

Drupal allows spaces in usernames, is there an easy way to stop this?

Also, where is the documentation on the username specs? What are the min/max lengths and which characters are allowed?

8

The best way to handle this is to implement hook_form_FORM_ID_alter for the user sign up and edit forms and append your own validator to check for spaces in the username field.

As for the length of a username, the minimum is 1 character and the maximum is 60 - as per the db schema.

4

A quick alternative is using Access rules, in drupal 6 you'll find them at yoursite.com/admin/user/rules for Drupal 7 I believe it was spun of to contrib as User restrictions

All you need to do to disallow spaces in usernames is create a rule like this: % %

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