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

I think it should be like...

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

Answer 2

String d = "11"

if (d.length() <= 2 && d.length() >=1) {
    try {
        Integer i = Integer.valueOf(d);
        return i <= 99 && i >= 0
    }
    catch (NumberFormatException e) {
        return false;
    }
}

Answer 3

pretty late but this will work.

^[1-9][0-9]?$

Answer 4

Why is regex a requirement? It is not ideal for numeric range calculations.

Apache commons has IntegerValidator with the following:

isInRange(value, 1, 99)

In addition, if you're using Spring, Struts, Wicket, Hibernate, etc., you already have access to a range validator. Don't reinvent the wheel with Regular Expressions.

Answer 5

This is the simplest possible, I can think of:

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

Allows only 1-99 both inclusive.