Java validating email address

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Unfortunately, it's not possible to send an email directly from the browser without outside help.

That outside help can take the form of some server-side coding on your application, or a third party service that you can use directly from the browser.

Assuring an email address is of a good quality requires a combination of various validation techniques. If you want to define \w, then you must be using \w in your regex.

Code : Valid email ids according to the above regular expression : [email protected]@[email protected]@[email protected]@[email protected] us understand the question first .

*/ User Info u = new User Info (); // loop until you get valid one(s) while (!

* * @author Roedy Green, Canadian Mind Products * @version 1.0 to do: check validity of & in first part of email address.

^ #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 package com.ashok.regularexpressions; import regex. Pattern; public class Email Validator Output Is '[email protected]' a valid email address?

true Is 'ashok*7*[email protected]' a valid email address?

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

As such, I recommend using only a simple regular expression for this task.

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