What Characters to allow for Usernames? [duplicate]

1. What characters should be allowed in usernames?
2. What characters should not be allowed in usernames?
3. How do you make your username special?
4. Do usernames have to be unique?

What characters should be allowed in usernames?

Usernames can contain letters (a-z), numbers (0-9), and periods (.). Usernames cannot contain an ampersand (&), equals sign (=), underscore (_), apostrophe ('), dash (-), plus sign (+), comma (,), brackets (<,>), or more than one period (.) in a row.

What characters should not be allowed in usernames?

Closed 10 years ago. Many web based user authentication systems don't allow usernames that contain characters other than letters, numbers and underscores.

How do you make your username special?

There are a few tricks you can use to create a truly unique username. Choose a word or a phrase you like and then translate it to a different language and use that as your username. You can also incorporate puns in your usernames to give them that special flair.

Do usernames have to be unique?

Why you need a unique username for every account. The main issue with usernames is that they are public, not hidden like your passwords. Reusing the same username makes it easier for malicious actors to build your online profile. It also makes it easier for advertisers and random people to find and track you online.