Regular expression for validating email in java

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. Restrictions in above regex are:1) A-Z characters allowed 2) a-z characters allowed 3) 0-9 numbers allowed 4) Additionally email may contain only dot(.), dash(-) and underscore(_) 5) Rest all characters are not allowed Let’s test some email addresses against above regex.List emails = new Array List(); emails.add("[email protected]"); emails.add("[email protected]"); emails.add("[email protected]"); emails.add("[email protected]"); emails.add("[email protected]"); emails.add("[email protected]"); emails.add("[email protected]"); //Invalid emails emails.add("@yahoo.com"); String regex = "^[A-Za-z0-9 _.-] @(. Unit testing is very important in these situations because they provide good feedback about the correctness of our regular expressions. You can test your program and reassure that your regular expression meets the rules on your policy about the form of the email addresses.

List emails = new Array List(); emails.add("[email protected]"); emails.add("[email protected]"); emails.add("[email protected]"); emails.add("[email protected]"); emails.add("user#@in"); emails.add("[email protected]"); //Invalid emails emails.add("user#domain.com"); emails.add("@yahoo.com"); String regex = "^(. )$"; Pattern pattern = Pattern.compile(regex); for(String email : emails) Output: [email protected]: true [email protected] : true [email protected]: true [email protected]: true user#@in : true [email protected] : true user#: false @: false In this regex, we have added some restriction osn username part of email address.Taking all these into account some valid email addresses are: Email ID [email protected] valid? Email validation using regular expressions is common task which may be required in any application which seek email address as required information in registration step.If you look at the Wikipedia article for valid email address, it supports a lot of special characters. But to cover most of the valid email addresses, I am assuming an email address to consist of characters, digits and special characters , – , . Also every email address must contain only one @ symbol. So a subdomain can contain characters, digits and special characters – and _.

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