Email Validation code

[Kumar Gaurav]

Hi All,
i have written a code to validate an email ID which is as follows:
import java.util.regex.*;

public class EmailValidation{
public static void main(String []args){
String email="[e-mail]";
Pattern p=Pattern.compile("[a-zA-Z]*[0-9]*@[a-zA-Z]*.[a-zA-Z]*");
Matcher m=p.matcher(email);
//Matcher m=p.matcher(args[0]);
boolean b=m.matches();
if(b==true)
{
System.out.println("Valid Email ID");
}
else
{
System.out.println("InValid Email ID");
}
}
}
If i m using email as either [e-mail] or [e-mail]
Its giving invalid EmailID.Kindly let me know how to deal i.
Thanks,
Kumar Gaurav

[Paul Sturrock]

Why not use the address validation parsing that is included in the javax.mail.internet.InternetAddress class? Save you reinventing the wheel. (Particularaly as SMTP addresses don't need to have things like an @ symbol to be valid).

[Campbell Ritchie]

. . . and welcome to JavaRanch

[Rob Spoor]

"yes boss",

Please check your private messages.

Thanks,

Rob

[Bill Shirley]

And I'll toss out there (because someone has to),

there is no guarantee that a "valid email address" is valid,
until you email something to it and receive a response,

[Pat Farrell]

Right, you can only validate that the form is RFC822 compliant. That means the form is proper. Not that there is a host and user to receive it.

[Uli Hofstoetter]

Originally posted by yes boss:

Pattern p=Pattern.compile("[a-zA-Z]*[0-9]*@[a-zA-Z]*.[a-zA-Z]*");

If i m using email as either [e-mail] or [e-mail]

These two examples simply don't match your pattern. Your pattern says "zero or more letters, followed by zero or more digits, follwed by @, followed by zero or more letters, follwoed by any character (note that the . is a special char in regexp, to match the char '.', it must be escaped '\.'), followed by zero or more letters.

I guess you should rethink your pattern or dive deeper into regexp to learn how to use them correctly.

Besides the options already mentioned, you could look at the commons-validator package from apache to validate the correct form of an email adress (and many more validations).

Kind regards,
Uli
[ May 21, 2008: Message edited by: Uli Hofstoetter ]

[Jyothis K.S.]

it is not working is i give input as "abcd@dmail" instead of "[e-mail]".
it is not validating the last portion

[Rob Spoor]

"Jyothis K.S.",

Please read your private messages regarding an important announcement.

Thank you,

Rob


That said, I'd just take Paul's advice and let InternetAddress do the hard work for you.

[Jp Rai]

use below one, it will work.

Pattern p=Pattern.compile("[a-zA-Z]*[0-9]*@[a-zA-Z]*\\.[a-zA-Z]*");

[Jelle Klap]

You really shouldn't disallow an e-mail adress based on regular expression matching, especially one you wrote yourself.
At most, you could use a regular expression to hint to the user that the e-mail adress might not be valid.
Have a look at this regex, which is used by a Perl module to validate against RFC822 (superseded by RFC2822).
Just, don't.