Match specific length x or y

Question

I\'d like a regex that is either X or Y characters long. For example, match a string that is either 8 or 11 characters long. I have currently implemented this like

Answer 1

For those of us looking to capture different lengths of the same multiple try this.

^(?:[0-9]{32})+$

Where 32 is the multiple you want to capture all lengths for (32, 64, 96, ...).