rails - REGEX for email validation

Question

I'm looking for a regex to validate an email to learn if it's valid or not.. I have the following:

def is_a_valid_email?(email)
    email_regex = %r{
      ^ # Start of string
      [0-9a-z] # First character
      [0-9a-z.+]+ # Middle characters
      [0-9a-z] # Last character
      @ # Separating @ character
      [0-9a-z] # Domain name begin
      [0-9a-z.-]+ # Domain name middle
      [0-9a-z] # Domain name end
      $ # End of string
    }xi # Case insensitive

    (email =~ email_regex)
end

Problem with the above is [email protected] does not return as valid when it should be. Any thoughts or suggestions for a better regex?

Thanks

Answer 1

validates_format_of :email, 
  :with => /^(|(([A-Za-z0-9]+_+)|([A-Za-z0-9]+\-+)|([A-Za-z0-9]+\.+)|([A-Za-z0-9]+\++))*[A-Za-z0-9]+@((\w+\-+)|(\w+\.))*\w{1,63}\.[a-zA-Z]{2,6})$/i

Don't ask me to explain it! That was from a validation plugin that I've since lost track of as all I needed was the email regex.

Answer 2

Not enough reputation to add a comment but if you are going to use the Devise regexp, and you are already using Devise itself, then you can simply use:

validates :email, presence: true, format: Devise.email_regexp