This week's book giveaway is in the OCMJEA forum. We're giving away four copies of OCM Java EE 6 Enterprise Architect Exam Guide and have Paul Allen & Joseph Bambara on-line! See this thread for details.
Scott, The easiest thing to do is leave them separate. I can't think of any way to check all three of these things. Note your requirements say the max length is 16 and your reg exp is 24. I assume one is a typo, but I figured I would mention it.