java - What is the regex for "Any positive integer, excluding 0"

Question

How can ^d+$ be improved to disallow 0?

EDIT (Make it more concrete):

Examples to allow:
1
30
111
Examples to disallow:
0
00
-22

It doesn't matter if positive numbers with a leading zero are allowed or not (e.g. 022).

This is for Java JDK Regex implementation.

Answer 1

Try this:

^[1-9]d*$

...and some padding to exceed 30 character SO answer limit :-).

Here is Demo