Question

I validate my input if it passes both regex above.
How can I tweak both regex so that it accepts a list ie (like on input2 and input3). Right now my regex only work on input1.

2 or higher:

^\d{2}\d*$

non 0:

^[1-9]\d*$

---

input1: 123
input2: 123, 456
input3: 123, 456, 789

Answer 1

First of all, the pattern you posted is equivalent to ^\d{2,}$, which requires the number to have two or more digits. The regex for an integer greater than or equal to 2 is more like ^[+-]?0*([2-9]|[1-9]\d+)$. From your description, it’s not clear which of these you intended.

Either way, what you want to use is something like this:

^(<pattern>(,\s|$))+$`

So for your scenario, it would be something like:

^(\d{2,}(,\s|$))+$                #2 or more digits
^(0*([2-9]|[1-9]\d+)(,\s|$))+$    #positive integers >= 2
^(0*[1-9]\d*)(,\s|$))+$           #positive integers > 0

I’m not sure what flavor of regex you’re using, but if your engine balks at the redundant use of $ in the patterns above, you could try something like

^(<pattern>,\s)*<pattern>$

instead. Example:

^(\d{2,},\s)*\d{,2}$    #2 or more digits, simplified

Bear in mind that a better way to do this is usually to split the string on the comma + whitespace separator, which will give you an array of strings you can try to parse as integers.