string hex characters only

[Zambonilli]

With the use of MongoDB in a lot of nodejs applications, a string hex validator would be really useful. This would allow an application to validate a mongo id w/o having to call the db with Joi.string().length(24).hex()

[Marsup]

I've already contributed to joi-objectid to make it right, I'm not sure it's worth an extra function considering the simplicity of it.

[Zambonilli]

Hex seems like a more reusable validator function. IE: mac addresses, serial numbers, etc and it's not another package to have to include. You can close out if you want since there's already a solution and it's a subjective decision.

[Marsup]

These often have dashes in it. Let me think about it.

[lock]

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