NL Postal codes should not allow left padding, and can not start with a 0

[Cerbrus]

Currently, these postal codes pass validation:

0011aa
11 (This gets left-padded to 0011)

The numeric part of Dutch postal codes should follow the format [1-9][0-9]{3}, so at very least, the left-padding should be disabled.

The regex is implemented correctly in postal-codes-js:

https://github.com/Cimpress-MCP/postal-codes-js/blob/master/formats/NL.json

[Cerbrus]

@istanishev would it be possible to get a response on this issue and the related pull request?

If this can't be implemented, that's okay, but then I'll have to handle those cases separately.

Thanks for your time and this very useful library 🥇

[Igrom]

@Cerbrus First of all, thanks a lot for contributing to the project. I'm very happy to hear that you are drawing benefit from using the library.

I lack knowledge of subject matter to review the PR and @istanishev is away on holiday this week. I'll try to refer him here, but cannot vouch for him reading the message before the week is over. I'll also notify other maintainers.

[Cerbrus]

@Igrom Thanks for the update. Knowing that there's not likely to be an merge this week helps, that's something I can communicate on my side :-)

[mmaruniak]

@Cerbrus the change looks good to me. Did you notice the failed pipeline?

[Cerbrus]

@mmaruniak I did, and I mentioned that on the pull request:

Apparently there are some unit tests in place that consider postal codes starting with a 0 to be valid. I'm not too sure how to update those tests without breaking other cases, since I can't get the project to run locally ("NuGet exited with code 3")

[mmaruniak]

Resolved by #74