Validating email in java

11-Jun-2016 23:52

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.

" + valid); } println("\n\n"); for (String temp : invalid Email Ids) { boolean valid = email Validator.validate Email(temp); println(" Email ID "+temp+" is valid?

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Taking all these into account some valid email addresses are: package com.journaldev.util; import regex. Pattern; public class Email Validator { // Regex pattern to valid email address private static final String EMAIL_REGEX="^[\w-\+]+(\.[\w]+)*@[\w-]+(\.[\w]+)*(\.[a-z]{2,})$"; //static Pattern object, since pattern is fixed private static Pattern pattern; //non-static Matcher object because it's created from the input String private Matcher matcher; public Email Validator(){ //initialize the Pattern object pattern = Pattern.compile(EMAIL_REGEX, Pattern. CASE_INSENSITIVE); } /** * This method validates the input email address with EMAIL_REGEX pattern * @param email * @return boolean */ public boolean validate Email(String email){ matcher = pattern.matcher(email); return matcher.matches(); } } package com.journaldev.util; public class Email Validator Test { // list of valid email addresses private static final String[] valid Email Ids = new String[] { "[email protected]", "[email protected]", "[email protected]", "[email protected]", "[email protected]", "[email protected]", "[email protected]", "[email protected]", "[email protected]", "[email protected]", "[email protected] Co M" }; // list of invalid email addresses private static final String[] invalid Email Ids = new String[] { "journaldev", "[email protected]", "[email protected]ail.a", "[email protected]", "[email protected]", "[email protected]", "journaldev()*", "[email protected]%*.com", "[email protected]", "[email protected]", "[email protected]", "[email protected]" }; private static Email Validator email Validator; public static void main(String args[]){ email Validator = new Email Validator(); for (String temp : valid Email Ids) { boolean valid = email Validator.validate Email(temp); println(" Email ID "+temp+" is valid? The length of the personal_info part may be up to 64 characters long and domain name may be up to 253 characters. The personal_info part contains the following ASCII characters. ") return (false) } To get a valid email id we use a regular expression /^\w+([\.-]? { | } ~ characters are legal in the local part of an e-mail address but in the above regular expression those characters are filtered out. It begins with at least one or more word characters including the underscore, equivalent to [A-Za-z0-9_].

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function Validate Email(input Text) { var mailformat = /^\w+([\.-]? \w+)*(\.\w{2,3})+$/; if(input Text.value.match(mailformat)) { document.form1.text1.focus(); return true; } else { alert("You have entered an invalid email address!

In the last post, I explained about java regular expression in detail with some examples.

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