# Email regex **URL:** \ **Category:** Ruby\ **Created:** [September 24, 2009, 11:47am UTC](https://www.ruby-forum.com/t/email-regex/176073 "2009-09-24T11:47:53Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![sijo](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/da6949/32.png) [@sijo](https://www.ruby-forum.com/u/sijo)\ **Post date:** [September 24, 2009, 11:47am UTC](https://www.ruby-forum.com/t/email-regex/176073/1 "2009-09-24T11:47:53Z")
Hi ``` I have a regular expression ``` /^([^.@\s,]+)@((?:[-a-z0-9]+.)+[a-z]{2,})$/i This exactly fits my need except for one. ``` But I have to pass this also removed_email_address@domain.invalid But Cannot. ``` Please help me to add this also to the above Some example which are valid for above removed\_email\_address@domain.invalid removed\_email\_address@domain.invalid Some example which are not valid for above removed\_email\_address@domain.invalid removed\_email\_address@domain.invalid sijo@@yahoo.com Thanks in advance Sijo ---
**Author:** ![sijo](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/da6949/32.png) [@sijo](https://www.ruby-forum.com/u/sijo)\ **Post date:** [September 24, 2009, 12:03pm UTC](https://www.ruby-forum.com/t/email-regex/176073/2 "2009-09-24T12:03:26Z")
[^.@\s,] This character class excludes “.” “@” whitespace and “,” from being in the first part of the e-mail. Remove the dot and removed\_email\_address@domain.invalid will be allowed. [^@\s,] /^([^@\s,]+)@((?:[-a-z0-9]+.)+[a-z]{2,})$/i However, removed\_email\_address@domain.invalid will also be allowed. It’s up to you here - do you want to make the regex perfect or will this be good enough. I think what you want is a optional repeating sequence of characters followed by exactly 1 “.” followed by a final sequence of characters before the @ Something like this /^((?:[^@\s,]+.)\*[^@\s,]+)@((?:[-a-z0-9]+.)+[a-z]{2,})$/i Maybe? Though you probably need to read here: [http://www.regular-expressions.info/email.html](http://www.regular-expressions.info/email.html) [http://blog.krugle.com/?p=208](http://blog.krugle.com/?p=208) On Thu, Sep 24, 2009 at 10:48 AM, Sijo Kg [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > ## Some example which are valid for above Sijo > > Posted via [http://www.ruby-forum.com/](http://www.ruby-forum.com/). – Paul S. [http://www.nomadicfun.co.uk](http://www.nomadicfun.co.uk) removed\_email\_address@domain.invalid ---
**Author:** ![sijo](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/da6949/32.png) [@sijo](https://www.ruby-forum.com/u/sijo)\ **Post date:** [September 24, 2009, 12:13pm UTC](https://www.ruby-forum.com/t/email-regex/176073/3 "2009-09-24T12:13:58Z")
On Thu, Sep 24, 2009 at 11:02 AM, Paul S. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > However, removed\_email\_address@domain.invalid will also be allowed. It’s up to you here > > - do you want to make the regex perfect or will this be good enough. > > I think what you want is a optional repeating sequence of characters > followed by exactly 1 “.” followed by a final sequence of characters > before the @ > > Something like this > > /^((?:[^@\s,]+.)\*[^@\s,]+)@((?:[-a-z0-9]+.)+[a-z]{2,})$/i Hmm, i forgot to escape a dot in there… /^((?:[^@\s,]+.)\*[^@\s,]+)@((?:[-a-z0-9]+.)+[a-z]{2,})$/i > > I have a regular expression – Paul S. [http://www.nomadicfun.co.uk](http://www.nomadicfun.co.uk) removed\_email\_address@domain.invalid ---
**Author:** ![sijo](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/da6949/32.png) [@sijo](https://www.ruby-forum.com/u/sijo)\ **Post date:** [September 24, 2009, 12:22pm UTC](https://www.ruby-forum.com/t/email-regex/176073/4 "2009-09-24T12:22:19Z")
Hi Paul S. Thanks again > Hmm, i forgot to escape a dot in there… /^((?:[^@\s,]+.)\*[^@\s,]+)@((?:[-a-z0-9]+.)+[a-z]{2,})$/i ``` When tried this I get 2 failures ``` removed\_email\_address@domain.invalid and removed\_email\_address@domain.invalid Sijo ---
**Author:** ![sijo](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/da6949/32.png) [@sijo](https://www.ruby-forum.com/u/sijo)\ **Post date:** [September 24, 2009, 12:30pm UTC](https://www.ruby-forum.com/t/email-regex/176073/5 "2009-09-24T12:30:22Z")
Did you read the pages I linked to? /^((?:[^.@\s,]+.)\*[^.@\s,]+)@((?:[-a-z0-9]+.)+[a-z]{2,})$/i (I forgot to put the . back in the excluded character classes at the start) On Thu, Sep 24, 2009 at 11:22 AM, Sijo Kg [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > removed\_email\_address@domain.invalid > > Sijo > > – > Posted via [http://www.ruby-forum.com/](http://www.ruby-forum.com/). – Paul S. [http://www.nomadicfun.co.uk](http://www.nomadicfun.co.uk) removed\_email\_address@domain.invalid ---
**Author:** ![sijo](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/da6949/32.png) [@sijo](https://www.ruby-forum.com/u/sijo)\ **Post date:** [September 24, 2009, 12:44pm UTC](https://www.ruby-forum.com/t/email-regex/176073/6 "2009-09-24T12:44:34Z")
Hi Paul S. > Did you read the pages I linked to? > > /^((?:[^.@\s,]+.)\*[^.@\s,]+)@((?:[-a-z0-9]+.)+[a-z]{2,})$/i > > (I forgot to put the . back in the excluded character classes at the > start) Lots of thanks.Now it works perfectly.Since it was a sudden fix I did not .But now I start reading that pages to get a very good understanding of regex Thanks once again Sijo ---
**Author:** ![sijo](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/da6949/32.png) [@sijo](https://www.ruby-forum.com/u/sijo)\ **Post date:** [September 24, 2009, 12:15pm UTC](https://www.ruby-forum.com/t/email-regex/176073/7 "2009-09-24T12:15:55Z")
Hi Paul S. ``` Thanks for the reply But if I use ``` /^((?:[^@\s,]+.)\*[^@\s,]+)@((?:[-a-z0-9]+.)+[a-z]{2,})$/i It fails removed\_email\_address@domain.invalid removed\_email\_address@domain.invalid and sijo@removed\_email\_address@domain.invalid Sijo ---
**Author:** ![sijo](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/da6949/32.png) [@sijo](https://www.ruby-forum.com/u/sijo)\ **Post date:** [September 24, 2009, 5:36pm UTC](https://www.ruby-forum.com/t/email-regex/176073/8 "2009-09-24T17:36:00Z")
Sijo Kg: > ``` > I have a regular expression > > ``` > > /^([^.@\s,]+)@((?:[-a-z0-9]+.)+[a-z]{2,})$/i > This exactly fits my need except for one. If your needs are checking email addresses’ validity, you really want to use something like¹ /^([a-zA-Z0-9&_?/`!|#*$^%=~{}+'-]+|"([\x00-\x0C\x0E-\x21\x23-\x5B\x5D -\x7F]|\\[\x00-\x7F])*")(\.([a-zA-Z0-9&_?\/`!|#$^%=~{}+'-]+|"([\x00- x0C\x0E-\x21\x23-\x5B\x5D-\x7F]|\[\x00-\x7F])"))\*@([a-zA-Z0-9&_?/`! |#*$^%=~{}+'-]+|\[([\x00-\x0C\x0E-\x5A\x5E-\x7F]|\\[\x00-\x7F])*\])(\. ([a-zA-Z0-9&_?\/`!|#_$^%=~{}+'-]+|[([\x00-\x0C\x0E-\x5A\x5E-\x7F]|\[ \x00-\x7F])_]))\*$/ …as " spaces! @s! "escaped quotes!" "@yahoo.com is a perfectly valid email address. (Note that " spaces! @s! "escaped quotes!" "@łódź.pl is also a perfectly valid email address which the above doesn’t match.) You might want to check ¹ [http://blade.nagaokaut.ac.jp/cgi-bin/vframe.rb/ruby/ruby-talk/173923?173909-178505](http://blade.nagaokaut.ac.jp/cgi-bin/vframe.rb/ruby/ruby-talk/173923?173909-178505) for the discussion on this. — Shot