Java validating email address

You can define a new class by extending one of the adapter classes and implement only those events relevant to you.

^ #start of the line [_A-Za-z0-9-\ ] # must start with string in the bracket [ ], must contains one or more ( ) ( # start of group #1 \.[_A-Za-z0-9-] # follow by a dot "." and string in the bracket [ ], must contains one or more ( ) )* # end of group #1, this group is optional (*) @ # must contains a "@" symbol [A-Za-z0-9-] # follow by string in the bracket [ ], must contains one or more ( ) ( # start of group #2 - first level TLD checking \.[A-Za-z0-9] # follow by a dot "." and string in the bracket [ ], must contains one or more ( ) )* # end of group #2, this group is optional (*) ( # start of group #3 - second level TLD checking \.[A-Za-z] # follow by a dot "." and string in the bracket [ ], with minimum length of 2 ) # end of group #3 $ #end of the line The combination means, email address must start with “_A-Za-z0-9-\ ” , optional follow by “.[_A-Za-z0-9-]”, and end with a “@” symbol. Email is valid : [email protected], true Email is valid : [email protected], true Email is valid : [email protected], true Email is valid : [email protected], true Email is valid : [email protected], true Email is valid : [email protected] , true Email is valid : [email protected], true Email is valid : [email protected] , true Email is valid : mkyong [email protected], true Email is valid : [email protected], true Email is valid : mkyong , false Email is valid : [email protected] , false Email is valid : [email protected] , false Email is valid : [email protected], false Email is valid : [email protected] , false Email is valid : [email protected], false Email is valid : mkyong()*@, false Email is valid : [email protected]%*, false Email is valid : [email protected], false Email is valid : [email protected], false Email is valid : [email protected]@, false Email is valid : [email protected] , false PASSED: Valid Email Test([

java validating email address-75

You might consider this a cynical view, but you should probably not try to implement a very strict email validation pattern with regular expressions.

The fully compliant RFC-822 email regex is nothing to be trifled with; in fact, it is a behemoth.

In this post I thought I’d share the source code for my Java email address validator class. I wrote it a long time ago, and I think I created it because Java’s class wasn’t properly validating email addresses at that time. String Tokenizer; /** * A class to provide stronger validation of email addresses. :) * */ public class Email Address Validator package com.email; import junit.framework.*; import com.email. :) */ public class Email Address Validator Tests extends Test Case Sorry, I don’t have the time to deeply describe this code, but I hope the unit tests give you a good idea of how to use the email address validator.

For instance, I think it would allow the string “fred” to be a valid email address, but on the internet you really want to see something like “[email protected]“. In this post I’m including the source code for my package com.email; import internet. Email Address Validator; /** * A class to test the Email Address Validator class. In summary, if you were looking for some Java code to help you validate email addresses, I hope this is helpful.

Again subdomain can be of multiple levels like One more important thing to note is that email addresses are case insensitive.

So we will use case insensitive flag to create the pattern object.

The email’s domain name must start with “A-Za-z0-9-“, follow by first level Tld (.com, .net) “.[A-Za-z0-9]” and optional follow by a second level Tld (au, my) “\.[A-Za-z]”, where second level Tld must start with a dot “.” and length must equal or more than 2 characters.

Here’s a Java example to show you how to use regex to validate email address. [email protected], [email protected], [email protected] [email protected], [email protected], [email protected] 3.

Taking all these into account some valid email addresses are: Email ID [email protected] is valid?

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