Mongoose validation: required : false, validate : regex, issues with empty values

I think your regex is failing validation on empty string which should in this case be valid since this field is not required. Why don't you try this regex:

/^$|^\d{10}$/

This will match an empty string or 10 digits.

You may try with a custom validator as they are only triggered when there is a value on a given key because the key selection for custom validation is done via path() :

var user = new Schema({

  // ...
  phone    : { type: String }, // using default - required:false
  // ...

});

// Custom validation
user.path('phone').validate(function (value) {

  // Your validation code here, should return bool

}, 'Some error message');

Have a look at this question: Why Mongoose doesn't validate empty document?

This will also effectively prevent the document to be persisted to the DB if validation fails, unless you handle the error accordingly.

BonusTip: Try to approach custom validations in a simplistic way, for example try to avoid loops when possible and avoid using libraries like lodash or underscore for in my experience I've seen that these may have a significant performance cost when working with lots of transactions.

Mongoose validation: required : false, validate : regex, issues with empty values

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