23. Valid Username Regular Expression - Java | Strings | Hackerrank
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 8 to 30 characters inclusive. If the username consists of less than 30 or greater than 8 characters, then it is an invalid username.
The username can only contain alphanumeric characters and underscores (_). Alphanumeric characters describe the character set consisting of lowercase characters , uppercase characters , and digits .
The first character of the username must be an alphabetic character, i.e., either lowercase character or uppercase character .
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