How can I validate the range 1-99 using a regex?

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 opt

Answer 1

Here you go:

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

Meaning that you allow either of

1. 1 to 9 or 01 to 09, 11 to 19, 21 to 29, ..., 91 to 99
2. 10, 20, ..., 90

Answer 2

Just do:

^([0]?[1-9]{1,2})$

The range will be set from 0 to 9 and the {1,2} means min digits = 1 and max digits = 2.

It will accept, for example: 0, 00, 01, 11, 45, 99, etc... It will not accept, for example: 000, 1.2, 5,4, 3490, etc...

Answer 3

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

should work

Answer 4

Off the top of my head (not validated)

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

Answer 5

This one worked for myself:

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

It checks for 10-99 or 1-9 => 1-99 with one leading zero allowed

Answer 6

^[0-9]{1,2}$ 

should work too (it'll will match 00 too, hope it's a valid match).