hacker rank 23th problem (valid username regex)

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23.VALID USERNAME REGEX


class UsernameValidator {
    public static final String regularExpression = "^[[A-Z]|[a-z]][[A-Z]|[a-z]|\\d|[_]]{7,29}$";
Scanner scan =new Scanner(System.in);
}


Compiler Message
Success
Input (stdin)Download
8
Julia
Samantha
Samantha_21
1Samantha
Samantha?10_2A
JuliaZ007
Julia@007
_Julia007
Expected OutputDownload
Invalid
Valid
Valid
Invalid
Invalid
Valid
Invalid
Invalid





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