JavaScript: test(pattern)

Question

var str = "AB123"
How can i check if str content two letters and Three Numbers .
AB123 True
A1B23 false
AB1234 False
....

Answer 1

When I say regular expression, does that tell you something? Because that is what we will need to use here unless we get crafty so if you don't know them let me know. We will get crafty ☺