Categories Asides Validate Emails Post author By Matt Post date March 25, 2005 13 Comments on Validate Emails How to REALLY validate emails. Share this:Click to email this to a friend (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Twitter (Opens in new window) Related ← Gallery: 3-25-2005 → Corporate Headquarters 13 replies on “Validate Emails” Well, that’s that. I’ve finally seen something that looks more like line noise than Perl does. Woah. Have you ever seen a regex that big? Somebody call a priest. *phew*! I’m glad someone else took the time — now I can spend it at the bar. The most insane thing I’ve ever seen. Yes, but when the next person quoted the entire thing when replying with a one line comment on how incredible that regex was.. I’m glad commenting on blogs doesn’t automatically quote the post! Geez… Frankly…: ([\w]+\.)*([\w]+)@([\w]+)(\.[\w]+)+ is good enough. it’s not as of spammers were trying to insert emails as $^Ã¹_`Ã¨.#’@&”~.com err, even: (\w+\.)*(\w+)@(\w+)(\.\w+)+ but then, you go the point That’s the longest regex I’ve seen! Wow, that is long. I haven’t tested which works better, but this one has always worked fine for me: /[^\x00-\x20()@,;:".[\]\x7f-\xff]+(?:\.[^\x00-\x20()@,;:".[\]\x7f-\xff]+)*\@[^\x00-\x20()@,;:".[\]\x7f-\xff]+(?:\.[^\x00-\x20()@,;:".[\]\x7f-\xff]+)+/i Whoops, sorry about that horizontal scrollbar. (Can I edit my own comments somehow?) I believe it is not how to match email address, but how to match the whole RFC822 address which includes one or more email address. An email address looks like this: firstname.lastname@example.org. But an RFC822 address may look something like “John Doe” <email@example.com>. Wow: Is it before or after RSA encryption? Heh. Now he has two problems. There are lots of valid email addresses that typical regexps don’t catch. IIRC, the following is a valid email address: “a b c”@[127.0.0.1] – a regexp is really not enough to validate an email address, because you end up with a monstrosity like this (with all respect to the author). Comments are closed.