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-Za-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 ?
credit goes to @joshuahunter (below, upvote his answer). Included here so that people see it.
URI::MailTo::EMAIL_REGEXP
VALID_EMAIL_REGEX = /\A[\w+\-.]+@[a-z\d\-]+(\.[a-z\d\-]+)*\.[a-z]+\z/i
You seem to be complicating things a lot, I would simply use:
VALID_EMAIL_REGEX = /\A[\w+\-.]+@[a-z\d\-]+(\.[a-z]+)*\.[a-z]+\z/i
which is taken from michael hartl's rails book
since this doesn't meet your dot requirement it can simply be ammended like so:
VALID_EMAIL_REGEX = /\A([\w+\-]\.?)+@[a-z\d\-]+(\.[a-z]+)*\.[a-z]+\z/i
As mentioned by CAustin, there are many other solutions.
EDIT:
it was pointed out by @installero that the original fails for subdomains with hyphens in them, this version will work (not sure why the character class was missing digits and hyphens in the first place).
VALID_EMAIL_REGEX = /\A[\w+\-.]+@[a-z\d\-]+(\.[a-z\d\-]+)*\.[a-z]+\z/i