Brackets are allowed in email local part

[lkm]

See https://en.wikipedia.org/wiki/Email_address#Local_part

[blikblum]

This is fixed in a fork i'm maintaining (tried contact this repository admins without luck): https://github.com/blikblum/backbone.validation

The updated package can be found at https://www.npmjs.com/package/backbone.validation

To use with node: npm install backbone.validation