Question

I need to validate some user input, to ensure a number entered is in the range of 1-99 inclusive. These must be whole (Integer) values

Preceeding 0 is permitted, but optional

Valid values

1. 1
2. 01
3. 10
4. 99
5. 09

Invalid values

1. 0
2. 007
3. 100
4. 10.5
5. 010

So far I have the following regex that I’ve worked out : ^0?([1-9][0-9])$

This allows an optional 0 at the beginning, but isn’t 100% correct as 1 is not deemed as valid

Any improvements/suggestions?

Answer 1

Off the top of my head (not validated)

^(0?[1-9]|[1-9][0-9])$