What is a valid username?

Related questions

1. Can you have more than 1 student overdraft?
2. How long can my account be overdrawn?
3. Which bank is good for student?
4. What is service request number?
5. How is overdraft paid back?
6. What are the benefits of a student bank account?
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9. What is a user ID example?
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Tags

1. #lowercase
2. #constraints
3. #characters
4. #satisfied
5. #following
6. #describe
7. #alphanumeric
8. #digits
9. #username
10. #consisting
11. #uppercase
12. #considered
13. #policy
14. #according
15. #underscores
16. #character
17. #contain
18. #valid