By default, Drupal 9 allows usernames to have spaces, periods(.), hyphens(-), apostrophes('), underscores(_) and @ symbols.
How would I disallow spaces, periods, apostrophes and @ symbols?
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1Maybe User Name Validation module or User Restrictions module can help.– Patrick KennyCommented Feb 9, 2022 at 5:29
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Thanks Patrick. Looks like the User Name Validation module does exactly what I need.– cofihouseCommented Feb 9, 2022 at 5:42
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Great. If it works for you, feel free to answer your own question with the details of how you configured the module.– Patrick KennyCommented Feb 9, 2022 at 5:52
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1 Answer
I used the Username Validation module suggested by Patrick Kenny in his comment. The Blacklist characters field shown by the module on /admin/config/people/user-name-validation did the trick.
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There are also a LOT of other questions on here that ask the same or similar question. See the "Related" block to the right -> Commented Feb 9, 2022 at 6:02
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All of those questions are outdated or have nothing to do with the question of disallowing characters. I did search the website first before posting. Now admittedly, I didn't search "validation" when googling, which is probably why I didn't find the module that solved my problem. Commented Feb 9, 2022 at 6:12