Regex pattern for numeric values [closed]

Answer 1

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

Answer 2

/^0|[1-9]\d*$/

Answer 3

This will allow decimal numbers (or whole numbers) that don't start with zero:

^(([1-9]*)|(([1-9]*)\.([0-9]*)))$

If you want to allow numbers that start with zero, you can do :

^(([0-9]*)|(([0-9]*)\.([0-9]*)))$

Answer 4

"[1-9][0-9]*|0"

I'd just use "[0-9]+" to represent positive whole numbers.

Answer 5

/([1-9][0-9]*)|0/