I think it would be useful to be able to define multiple regex() patterns to a string each with their own, customizable message.

Use case
I am trying to validate a password coming in from users. Let's say, I want to require the password to contain:

1. at least one alphabetic character
2. at least one number
3. minimum of 6 characters
4. maximum of 30 characters

Here is a condensed version of my validation schema to make this happen.

// User schema
var schema = Joi.object().keys({
  email: Joi.string().trim().email().max(100).required(),
  password: Joi.string().min(6).max(30).regex(/.*[0-9].*/).regex(/.*[a-zA-Z].*/)
});

The validation works, and the message returned is "password fails to match the required pattern" when trying things that won't pass the two regex validators.

A common best practice is to tell the user what they are missing. For example, if a user tries to enter the password, MyAwesomePassword, I'd like to tell them, they need a number. If they try, 123456, I'd like to tell them they need at least one letter.

Am I just missing something here? Is there already a way to accomplish this with Joi?