add isEIN validator

[rubiin]

The Employer Identification Number (EIN), also known as the Federal Employer Identification Number (FEIN) or the Federal Tax Identification Number, is a unique nine-digit number assigned by the Internal Revenue Service (IRS) to business entities operating in the United States for the purposes of identification. When the number is used for identification rather than employment tax reporting, it is usually referred to as a Taxpayer Identification Number (TIN), and when used for the purposes of reporting employment taxes, it is usually referred to as an EIN.[1] These numbers are used for tax administration and must be not used for any other purpose. For example, the EIN should not be used in tax lien auction or sales, lotteries, etc.

https://en.wikipedia.org/wiki/Employer_Identification_Number

[rubiin]

@profnandaa @ezkemboi I can do a pr

[profnandaa]

Do we have similar ones for other locales other than US?

[rubiin]

according to wiki, it is only appliccable fo US, but widely used in US

[profnandaa]

Any way we can make this more generic to allow later additions of other locales? That's in the naming of the validator...

[rubiin]

yeah sure, i will write in a way so it can be extended in future @profnandaa

[profnandaa]

Which name do we go with here?

[rubiin]

I think Employee identification number , EIN is the best

[profnandaa]

Can we go with Taxpayer ID (TID), could make sense to anyone off the bat, and I can see equivalents for other locations. So isTaxID(str, locale). What do you think?

[rubiin]

sure that should do

[profnandaa]

Cool, you can go ahead with the PR.