Check if value is a RegEx

[donaldpipowitch]

What is the correct way to check if a value is a RegEx? With an API like Joi.string(), Joi.object(), Joi.array() I thought something like Joi.regex() would be available, but this isn't the case. I couldn't find something in the docs about this.

[gaastonsr]

It would be a nice addition.

[hueniverse]

We can add a rule for checking obj.constructor.toString(). Something like joi.object().type('RegExp'). Would that work?

[donaldpipowitch]

Sounds good! Maybe Joi.regex() could alias to Joi.object().type('RegExp') as it is a JS-native object just like Date and I would expect the API to support these in this way.

[hueniverse]

@donaldpipowitch nah. No need for shortcuts on that one. Be explicit.

I'll take a pull request adding this.

[donaldpipowitch]

You decide, that's okay for me. I would still recommend it for consistency. Why would there be an API like Joi.date(); but not Joi.regex()? I think this would be confusing for someone who sees the API for the first time.

[hueniverse]

Because dates are very common in data schema while regex is really only applicable for JS objects. Validating that something is a regex is just not that useful use case.

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