You've successfully subscribed to The Poor Coder | Hackerrank Solutions
Great! Next, complete checkout for full access to The Poor Coder | Hackerrank Solutions
Welcome back! You've successfully signed in.
Success! Your account is fully activated, you now have access to all content.
Enable dark mode
Valid Username Regular Expression
Hackerrank Valid Username Regular Expression Solution
You are updating the username policy on your company's internal networking platform. According to the policy, a username is considered valid if all the following constraints are satisfied: The username consists of to characters inclusive. If the username consists of less than or greater than characters, then it is an