Email validation using Regular Expression

Hi,
the expression is pretty good.
But i have a problem with restricting length of the email.
I've tried:
^([a-zA-Z][\w\.-]*[a-zA-Z0-9]@[a-zA-Z0-9][\w\.-]*[a-zA-Z0-9]\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z]){0,70}$

but it dos'nt work. I could probably do it by restricting the length of the address and domain separately, but i don't want to do that.
Is there a simpler way ?

thanks,
gg

thnx a lot for the code,,,

this site rocks!!!!

Many thanks, works well, and better than all other regular expressions I have so far tried.

Very limited email addresses. Does not allow email addresses with an IP address and port number.

Does not permit underscores (_) in the mail address (Which is valid)

Thanks.

Disagree with llb as this *does* allow underscores eg my_name@this.my_domain.com but not leading or trailing '_'. Valid point about IP and port addresses being restricted tho.

check this: (is in Perl)

[\w\.\-]+\@[\w\.\-]+\.(com|edu|org|net|gov|mil|info){1}(\.(\w{2}))?$

I like short, clean code so I refactored the function as follows and it still seems to work ok. Did I take anything out important?


Function isValidEmail(myEmail)

Dim regEx

Set regEx = New RegExp
regEx.IgnoreCase = False
regEx.Pattern = "^[a-zA-Z][\w\.-]*[a-zA-Z0-9]@[a-zA-Z0-9][\w\.-]*[a-zA-Z0-9]\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z]$"

isValidEmail = regEx.Test(myEmail)

End Function

Really neat, but do you have a regular expression that allows more than one email??? as in

1. panchals@vsnl.com
2. panchals@vsnl.com; panchals@vsnl.net

this way, either one or more emails can be added....

Thanks...

I've been messing around with a regular expression for a list of emails (separated by ';'). This seems to work okay. Just remember to trim out any extra spaces and to remove a possible trailing ';'.


^(([\w-]+@[\w-]+\.(com|net|org|edu|mil)(\s*$|(\s*;\s*)))+)$

That email RegExp is great if your email isn't:

1@test.com

Keep on trying. You may come up with a perfect one in a couple hundred years :)

this seams to solve some of the problems for ppl with emails such as 1@test.com
am i missing something?

regEx.Pattern = "^[a-zA-Z0-9]*[\w\.-]*[a-zA-Z0-9]@[a-zA-Z0-9][\w\.-]*[a-zA-Z0-9]\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z]$"

_example@example.com is a valid address.
All alphanumeric characters are valid for free text of an email address. Meaning the user name and domain name.

Here is mine.
/^[\w][\w\.-]*[\w]@[\w][\w\.-]*[\w]\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z]$/

I first split the input string into an array by ; then loop through validating, building an array of indexes of invalid emails.

I've never delt with IP emails, but I recon it'd be best to check for an IP pattern and execute a different expression.

i like this regular expression stuff. cool

I don't know if addresses that take the following form are valid:

user..name@domain.com

James's expression lets these through, but the only way I can think to exclude these effects how many dots you're allowed. i.e.

^[\w]*[\w\.-][\w]*@[\w]*[\w\.-][\w]*\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z]$

This also fails with short addresses such as 1@test.com.

I'm starting to think it might not be possible to perfectly validate all address forms with a single pattern.

I'm a complete RegExp newbie, so tell me if I'm talking rubbish :)

Rich

Here is an idea I came up with to skip multi dots. Your regex needs to support extended options. This is an Extention of James Laugesen's post. The prohibits periods that are followed by 1 or more extra periods.

/
^[\w]
( [\w-] | \. (?! \.+?) )*
[\w]
@
[\w]
( [\w-] | \. (?! \.+?) )*
[\w]
\. (?! \.+?)
[a-zA-Z]
( [\w-] | \. (?! \.+?) )*
[a-zA-Z]$
/x

Most email validators that arnen't at least a page long and are not complicated are not RFC822 compliant. Here is a C# shot at writing the email validator:

http://www.codeproject.com/csharp/RFC822Validator.asp

Most "valid" validators are based off of the ones in the Regex book written by Jeffrey Friedl.

man, you guys are forgetting that you _can_ run into an email address that is in a tld.. example of a valid one: n@ai
so you _cant_ force a . to be present...

Check this out...

http://www.ex-parrot.com/~pdw/Mail-RFC822-Address.html

Thanks for this - this has really helped me as I was battling to do the validation correctly in asp using regexp

thanks for the help / site......... couldn't of managed with out it

i go through ur email validation code. But i want validation of email like
abc@xyz.co.in
can anybody help me?

I have to agree with rachits' comment, posted on April 17. I did find a translation of Jeffrey Friedl's validation in the language I needed (in my case: PHP), and it's working great. I would recommend it to anyone trying to validate email addresses.

A one-line regex to validate emails is more likely to fail on one address or another. It can't be perfect.

<asp:RegularExpressionValidator runat="server"
ControlToValidate="Email"
ValidationExpression="\w+\@\w+\.com"
ErrorMessage="That is not a valid email address" />

Hi,
I want to validate an apostrophe in email id i.e neil'oconnor@test.com. How do I do that.
I'm using following regexp:
var rx=new RegExp("^[\\w'\.=-]+@[\\w\\.-]+\\.[a-z]{2,4}$");if(!rx.test(myV))addErr=true;

Plz help

I am new to ASP. In this email validation function, what is 'RegExp'. Is this a keyword or user-built function?

Regards,
Priya

here is a expressionn that I tink can detect all the regular e-mail

it's a corection of the original one
-I add the underscores (_)
-it's now accept 1@test.com
-but for user..name@domain.com I dont know if its valid

[\w\.-]*[a-zA-Z0-9_]@[\w\.-]*[a-zA-Z0-9]\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z]

Hello,

I have been trying hard to find an email regular validation expression which will only allow email addresses which end in the same way. Meaning that after the @ it has to be the same. Therefore only people from the company (has the same ending to the email for emplyees) will be able to register with the site. How can i go about this. email addresses go like:

[b]a.a.surname@building.company.co.uk[/b]

Is there anybody who can help me?

[:(]


<Added>

a.a.surname@building.company.co.uk

can u plz tell me the date validator expression
format req. is mm/dd/yyyy

Great Help from Codetoad

This [\w\.-]*[a-zA-Z0-9_]@[\w\.-]*[a-zA-Z0-9]\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z] works for me.

Can any one give the Multiple users validation. Zack posted multiple which accepts only limited domain.

I need a code which should accept any domain in otherwords I need a code without specifying any domain names.

For example the following are valid email.
1. 1@abc.co 2. 1@abc.co.au 3. 1@abc.co.au; 1@abc.co 1. _1@abc.co

raj

thanks for such a better idea.

I want to validate only the body of the email, it should meet the criteria:
The body should not allow '@' and '.' but should allow underscore '_' while validating the email address.

eg: allowed format: great_lake
not allowed format: great.com
or great@com
or great_lake.com
or great_lake@r.com

Can somebody provide me with the reg-ex for the above

This is what I use the regular expression allows apostrophe's, underscores, a-z, 0-9, periods and splits at the @ symbol and allows two periods after it i.e. tool'omally@tool.co.uk or dick_head@tool.com

//validate the email
function validate_email($email)
{
// regexp for a valid email address
$regexp = "^(['_a-z0-9-]+)(\.['_a-z0-9-]+)*@([a-z0-9-]+)(\.[a-z0-9-]+)*(\.[a-z]{2,5})$";

return (eregi($regexp, $email) > 0);
}