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From: Walmart Voucher <[email-masked]>
Date: Thu, 21 Aug 2014 07:59:43 -0700

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linux journal article you mention is factually wrong in several respects. In particular Lovell clearly hasn't Is th That regex is obviously written from an RFC. If theres an updated one that regex targets the "address" grammar element, it's perfectly reasonable to require users to type in an "addr-spec", and make display name a separate box. The regex is so large because it has to repeat addr-spec numerous times (and allows folding whitespace, which you could simply require users not to use). Your web form is not an SMTP server, it

It would be nice to have a regex describing exactly the language of (I'm not criticizing here) is that the answer here with the most upvotes doesn't even have a regex entered something@something into the field in a client side validation just to catch simple mistakes - but in Martin, I gave you a +1, only to later read that foobar@dk is a valid email. It wouldn't be pretty, but if you want to be both RFC compliant AND use common sense, you should detect cases such as this and ask the user to and then where are they? They're not on your site any more and they're wondering why they couldn't sign up. Actually no they're not - they've completely forgotten about you. However, if you could just do a basic sanity e reason to validate email is because some SMTP servers are very picky about the address format and delimiting in email recipient lists. For example, the SMTP server I'm working with at work doesn't like it when you mix semicolons and commas as delimiters between addresses. Relev
ant to this question, it also doesn't like "None" tice the period before the @). If one of these anomalies is in the list, the whole recipient list will not get the email. SAGExSDX Jul 21 '10 at 15:09

at minimum. The reason being you don't want e-mails going to your localhost or local domain. I would also prevent "whitespaces" and anything between 0x00-0x1f from appearing in your e-mail as that can be an attack vector to your mail server. Also put a size limit as well to prevent 257+ character e-mail addresTechnically, a TLD isn't necessary, me@hotmail is valid. A better solution than regex would be to have a list of common email providers (hotmail.com, me.com, gmail.com, yahoo.com) and search for typos in the address. Perhaps adding a js typeahead that suggests all the common email providers to help the user prevent typos (in addition to an email Most importantly, it doesn't fail fo which is a lovely email address to send for those pesky places that want an emeason to validate at the client side will be to save a trip to server. A more reasonable reason could be to provide a better user experience by warning at the earliest opportunity possible during a registration - w
ould save time for both the user and probably also for a customer care person