Is this a class project?
Are you limited to a single expression? If not, while it can be done, I would prefer to break it up into two expressions to make it easier for others and yourself to support in the future. Test for your 6-20 characters first and then pull out the numbers and check for 2+.
Yes, a class project, so it all has to happen together unfortunately. Thank you for any help!
Ok. Figure it out. You're learning. Googling for a quick answer or asking someone else to do your work might get you an easy A in the short term, but it'll take you much longer to become a programmer -- assuming that is your goal.