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Regex - email

Posted on 2013-11-15
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This is the email pattern I use to valid email address format.  I just want to add "`"  to this pattern. Sample john'ona.doe@mysite.com This is a good format.
^([\w\d\-\.]+)@{1}(([\w\d\-]{1,67})|([\w\d\-]+\.[\w\d\-]{1,67}))\.(([a-zA-Z\d]{2,4})(\.[a-zA-Z\d]{2})?)$
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Question by:VBdotnet2005
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Expert Comment

by:ozo
ID: 39652176
fred&barney@stonehenge.com
is a valid email address that is not recognized by the above pattern
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Author Comment

by:VBdotnet2005
ID: 39652219
If that is the case, could you add that also?
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by:bevhost
ID: 39652317
^([\w\d\-\.\`\&]+)@{1}(([\w\d\-]{1,67})|([\w\d\-]+\.[\w\d\-]{1,67}))\.(([a-zA-Z\d]{2,4})(\.[a-zA-Z\d]{2})?)$
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Expert Comment

by:sentner
ID: 39652344
To add characters to the name portion, just add them inside the first set of square brackets. There are a bunch of possible characters missing from the pattern above (including: ! # $ % & ' * + - / = ?  ^ _ ` . { | } ~), please see:

http://tools.ietf.org/html/rfc3696

That said, your expression does include some unnecessary redundancies (like "\w\d" which can be simplified to just \w).   You may need to escape out some of the special characters (possibly including `) but not all of them.
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by:bevhost
bevhost earned 500 total points
ID: 39652362
You're still a long way from accepting all valid email addresses.
see
http://en.wikipedia.org/wiki/Email_address
Also I think ' is probably more common than `
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LVL 75

Assisted Solution

by:käµfm³d 👽
käµfm³d   👽 earned 500 total points
ID: 39652363
You might want to read the information presented at this link:

http://www.regular-expressions.info/email.html

...pertaining to why overly-complicated email patterns aren't usually necessary.
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LVL 14

Accepted Solution

by:
sentner earned 500 total points
ID: 39652393
This should catch all of the possible characters:

^([\w!#$%&\'\*+-/=\?^\`\.\{\|\}~]+)\@{1}(([\w-]{1,67})|([\w-]+\.[\w-]{1,67}))\.(([a-zA-Z\d]{2,4})(\.[a-zA-Z\d]{2})?)$
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LVL 11

Assisted Solution

by:SAMIR BHOGAYTA
SAMIR BHOGAYTA earned 500 total points
ID: 39655778
hi.. You just use this...

private static Regex emailRegex = new Regex(@"^([a-zA-Z0-9\'_\-\.]+)@((\[[0-9]{1,3}" +
         @"\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\" +
         @".)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$")
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