How do i validate an input that consists of a mix of 1 uppercase letter, 2 lowercase letters and 3 digits?

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VB

I' not sure how to do this. The code is supposed to validate the user id that is entered so that there is 1 upper case letter, 2 lower case letters and 3 digits,eg Hap123.

What I have tried:

Dim UserId As String
Dim Length As Integer
Dim Format As String
Console.WriteLine("Input your User ID")
UserID=Console.ReadLine

WHILE Length = 6
IF Format = UCASE(Left(UserID,1))& LCASE(MID(UserID,2,2))&INT(RIGHT(UserID,3))
THEN Console.WriteLine("Correct format")
ELSE Console.WriteLine("Wrong format")
ENDIF
ENDWHILE