Validating email addresses with Regular Expressions
Posted Tue, 23 Jan 2007
Wrote a quick function today also to verify that the syntax of an email address is valid, using regular expressions.
^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$This will match a userid containing letters, numbers, underscores, dots and hyphens, followed by an at sign, then a domain name containing letters, numbers, hyphens and dots, followed by a suffix of 2-to-4 characters.
Using this regex, I can ensure that the user has entered a potentially valid email address before attempting to send out a confirmation email.
(
permalink |
add to del.icio.us |
tags: ruby email regex web programming )
Related Stories
Related Books
Comments
On June 22, 2008 at 07:15 PM Timothy Fanelli wrote:
Zachary - Thanks for the links - I skimmed the first briefly and will take a look at the second over the weekend, and maybe update my plugin before it gets released.
On June 22, 2008 at 07:15 PM Les Hazlewood wrote:
Hi Tim,
In the spirit of this blog post, I thought I'd forward on mine, which implements RFC2822, which supercedes the old RFC822. It is in java, but should be easily translatable to Ruby:
http://www.leshazlewood.com/?p=5
Cheers,
Les
On June 22, 2008 at 07:15 PM Zachary Bedell wrote:
That's a good start, and it'll probably cover the vast majority of cases, but... To truly check for all valid email address possibilities, you've got a lot more work to do.
See:
http://www.regular-expressions.info/email.html
http://www.ex-parrot.com/~pdw/Mail-RFC822-Address.html
On June 22, 2008 at 07:15 PM Les Hazlewood wrote:
Hi Tim,
In the spirit of this blog post, I thought I'd forward on mine, which implements RFC2822, which supercedes the old RFC822. It is in java, but should be easily translatable to Ruby:
http://www.leshazlewood.com/?p=5
Cheers,
Les