How to get the following pattern via regex in AngularJS?

Issue

I am doing some validations in my form using AngularJS. In that there are a few fields where I need to accept only numbers. The range is from a single digit to n digits. I am planning to using regex in ngPattern attribute of AngularJS.

I need to accomplish the following things using the regex:

• If it's a single digit, it should not be a 0. Can be anything between 1 to 9.
• If it's a multi digit number, all numbers from 0 to 9 can be used in any position where not all numbers are 0 i.e. the total value of the input should not be 0

I am struggling to find a regex that will accept such pattern. Is it possible to accept such pattern using regex? Earlier I was thinking that at least the last number should be non-zero digit so that entries like 0000 will not be possible and will have to be 000x where x is anything from 1 to 9. But then this logic is flawed as it wont allow people to input values in multiples of 10.

How do I implement this validation?

Solution

I think, this is the one you're looking for:

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

It matches on any number that contains at least one non-zero digit.

Answered By - Adam