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Should you allow username to use Apostrophe (aka quotes )
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this post was submitted on 24 Feb 2024
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Any field in a DB can be vulnerable to SQL injection. Filtering out characters is a terrible way to mitigate that attack, you should be using prepared queries where it does not matter what chars you have in your username or password. You should never form a query with string concatenation.
You may want to limit chars in a username to ones allowed in URLs (or even ones that don't need escaping) if you ever want it to appear in a URL though. Or any other places the user name might be used, but a entry in a DB should not matter.
Another good reason to filter characters is based on what people expect. You don't want people to be making accounts like OfficialSiteSupport'
There are a lot of edge case characters around visually indistinguishable names. If that is a concern usernames should use a restricted known character sets instead of trying to block specific characters. You likely should also treat lookalike characters as equivalents when checking for username overlap.