Ruby Email validation with regex

Question

I have a large list of emails I am running through. A lot of the emails have typos. I am trying to build a string that will check valid emails.

this is what I have for regex.

def is_a_valid_email?(email)   (email =~ /^(([A-Za-z0-9]*\.+*_+)|([A-Za-z0-9]+\-+)|([A-Za-z0-9]+\+)|([A-Za-z0-9]+\+))*[A-Z‌​a-z0-9]+@{1}((\w+\-+)|(\w+\.))*\w{1,63}\.[a-zA-Z]{2,4}$/i) end 

It passes if an email as underscores and only one period. I have a lot of emails that have more then one periods in the name itself. How do I check that in regex.

[email protected] # <~~ valid foo.bar#gmail.co.uk # <~~~ not valid [email protected] # <~~~valid  [email protected] # <~~ not valid  get_at_m.e@gmail  #<~~ valid 

Can someone help me rewrite my regex ?

Answer 1

This has been built into the standard library since at least 2.2.1

URI::MailTo::EMAIL_REGEXP