Regular expression for numeric range 0000 to 9999

Question

I need a regular expression for a text field in my asp.net website

which should lie in between

0000 to 9999

it is not be

0 to 9999

Answer 1

I think this could be:

^\d{4}$

Don't forget to escape it if you are using c#

string numReg = @"^\d{4}$";

Answer 2

Along with the other answers, you could also try this.

^[0-9]{4}$