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Regular Expression Details

Title Test Find Pattern Title
Expression
^[\w-\.][email protected]([\w-]+\.)+[\w-]{2,4}$
Description
This expression matches email addresses, and checks that they are of the proper form. It checks to ensure the top level domain is between 2 and 4 characters long, but does not check the specific domain against a list (especially since there are so many of them now).
Matches
Non-Matches
Author Rating: The rating for this expression. Steven Smith
Source
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Existing User Comments

Title: I'm so glad this site exists!
Name: Jack
Date: 9/13/2020 5:40:07 PM
Comment:
Awesome! Thanks alot!


Title: Special character in first half of email address
Name: Neola
Date: 7/13/2015 6:57:13 AM
Comment:
^([\w\W][^@]+)\@([\w-]+\.)+[\w-]{2,4}$ modified regex for email address having [email protected] ('+')


Title: special character in domain name
Name: zikwag
Date: 7/17/2009 2:45:41 PM
Comment:
how can i modify this regex so that the address [email protected]&j.com bypass validation rules


Title: special character in domain name
Name: zikwag
Date: 7/17/2009 2:06:30 PM
Comment:
how can i modify this regex so that the address [email protected]&j.com bypass validation rules


Title: Further refined
Name: cottsak
Date: 1/4/2007 11:09:29 PM
Comment:
the following is modded further from the comments on this page. it additionally: - does not allow underscore in the domain name - does not allow hyphen at start or end of domain name (sub-domains included) also, i have expand the \w change so that it's explicit, irrespective of engine flavour the only other thing i didn’t factor (that i could think of) was minimal number of characters for a domain. generally this is >= 2 but for sub-domains it may be 1 so i left it. it would also make the expression a lot more complicated. ^[-a-zA-Z_0-9.][email protected]([a-zA-Z0-9]([-a-zA-Z0-9]*[a-zA-Z0-9]|[a-zA-Z0-9])?.)+[a-zA-Z]{2,4}$


Title: \. inside a character class does not mean .
Name: Udo Güngerich
Date: 8/14/2006 2:42:10 AM
Comment:
Inside character classes . does not have a special meaning, so you do not need to escape it! Regards, Udo P.S.: [[:alnum:]_-\.] must of course be [-[:alnum:]_\.] else the dash tries to be a range and fails ;)


Title: [\w] is not a character class according to Perl 5.8.6
Name: Udo Güngerich
Date: 8/14/2006 2:37:23 AM
Comment:
So [\w-\.] is probably better written as [[:alnum:]_-\.] (with POSIX character classes) Regards, Udo


Title: little improvement
Name: Jocker
Date: 7/10/2006 11:25:32 AM
Comment:
^[\w-\.][email protected](?:[\w-]+\.)+[a-zA-Z]{2,4}$ a slightly better version: this one does not capture part of the domain, does not allow numbers in the regional code


Title: Incompatible with internet standards
Name: Josh Jore
Date: 2/23/2004 11:34:04 AM
Comment:
The expression does not account for whitespace or quoting in the mailbox portion of the address and neglects to handle quoted domains.


Title: FLANTUS
Name: SGSGS
Date: 1/22/2004 5:14:13 PM
Comment:
THANKS A LOT! EXELLENT SITE ESPECIALLY TO THE STARTERS. IT IS ALSO GREAT FOR LOOKUP. THANKS


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