Belgium vat validation issue

[mattickx]

See parent/forked repo: se-panfilov/jsvat#104

I ask to the community, is this something we want ?

[pere-pleo]

Is the question if we want the BE VAT input validation without the 0 to fail or if we want the validation to pass but somehow signal that the initial input was invalid? Asking because the latter was suggested here.

[mattickx]

Is the question if we want the BE VAT input validation without the 0 to fail or if we want the validation to pass but somehow signal that the initial input was invalid?

I'm also wondering if Belgium is the only country we change such input?

I would suggest having strict validation in any case, without changing the input value.

So validating based on formats:
BE0 + 9 numbers
OR
BE1 + 9 numbers

Regex would be: /^(BE)([0-1]{1}\d{9})$/

Making the following valid:
BE0838713666
BE0838713666
BE1838713666

And making the following invalid:
0838713666
0838713666
1838713666

And we leave it to the developers to add it before validating if they would like to validate only numbers of vat:
For example: checkVat('BE' + userInput, ...)

This would also mean we don't need to change the input nor alert that an input has changed.
But I'm open for discussing this, what is your current use-case?

[mattickx]

Like previously mentioned, I've changed Belgium such that the format becomes:
BE + Prefix (0 or 1) + 9 numbers

"BE" prefix currently needs to be present, but can be changed if that is a use case that is needed.
I've added 3 lines for this in commentary with the notice: "BE: Optional Country Code".

Validating without BE could be achieved by: checkVat('BE' + userInput, ...)

[satblip]

A Belgian company number without BE is indeed a valid KBO number (local company registry), but not a correct VAT number that will need the prefix to be present

[mattickx]

I'm closing this issue for now, feel free to comment if the community has other concerns about this specific case