Regular Expression checking for numeric length

Question

I want to validate a zipcode either 5 digit or 9 digit. I've written this /^(\d){5|9}$/ but its not matching anything.

But when i give /^(\d){5}$/ its matching properly for 5.

Please help.

Answer 1

Make the last four optional:

^\d{5}(\d{4})?$

Note that I removed the opening/closing slashes as they have nothing whatsoever to do with regex; they are an application language artefact.

Answer 2

The following regex should work.

^(\d{5}|\d{9})$