Regular Expressions - Restrict Possible Usernames: Question about the Solutions

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So I was super-stumped on this one, and checked the given solutions, but I was very confused about the curly braces used in the example solutions. Maybe I missed something, but when did we go over using the curly braces to limit the amount of characters that are tested in a code? That’s a very important lesson that I wish we had a chance to learn about!

Challenge: Regular Expressions - Restrict Possible Usernames

Link to the challenge:

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Thank you for the speedy reply!

I got to that lesson not to long ago. I guess I was just wondering why they would introduce it in a solution when they hadn’t covered it yet :sweat_smile:

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