Accept the 11-character postal code for Nigeria (NG)

[Adeniyikayodee]

NIPOST launched a new postcode for Nigeria in October 2026. It has 11 characters in five segments, for example EK-01-A03-FK-01: two letters, two digits, three letters or digits, two letters, and two digits. The two numeric segments run from 01 to 99.

The NG pattern accepted six digits only, so every new code failed validation. It now accepts both, with the new code written with hyphens, with spaces, or with no separator.

Format reference: https://docs.postcode.gov.ng/concepts/postcode-format

PHPUnit passes locally.

[Adeniyikayodee]

@bojanz, I would be grateful if you could look at this whenever your time allows. Nigeria launched a new national postcode on 1 October, and the NG pattern still describes the six-digit code it replaces. Many shops and platforms take their address rules from this library, so I wanted to raise it here with care. The format and its source are in the description, and I am glad to adjust the pattern or the test to fit how you prefer them. Thank you for the work you put into this library, and please take it at your own pace.

[bojanz]

Thanks!

[Adeniyikayodee]

Thank you, @bojanz, for the quick merge and release.