email-validation

When users create an account on my site I want to make server validation for emails to not accept every input. I will send a confirmation, in a way to do a handshake validation . I am looking for something simple, not the best , but not too simple that doesn't validate anything. I don't know where limitation must be, since any regular expression will not do the correct validation because is not possible to do it with regular expressions. I'm trying to limit the sintax and visual complexity inherent to regular expressions, because in this case any will be correct. What regexp can I use to do

is this javascript function (checkValidity) correct? function checkTextBox(textBox) { if (!checkValidity(textBox.getValue())) displayError("Error title", "Error message", textBox); textBox.focus(); } function checkValidity(e) { var email; email = "/^[^@]+@[^@]+.[a-z]{2,}$/i"; if (!e.match(email)){ return false; else return true; } } EDIT: All the answers appreciated! Thanks! E-mail address are defined in RFC 5322, § 3.4 . The relevant non-terminal is addr-spec . The definition turns out to be somewhat squirelly, due to both the complications of domain specifications and supporting old,

I am using the follwoing regular expression (".+@.+\\.[a-z]+") Bit it accepts #@#.com as a valid email. What's the pattern I should use? CoolBeans You should use apache-commons email validator. You can get the jar file from here . Here is a simple example of how to use it: import org.apache.commons.validator.routines.EmailValidator; boolean isValidEmail = EmailValidator.getInstance().isValid(emailAddress); Here's a web page that explains that better than I can: http://www.regular-expressions.info/email.html ( EDIT : that appears to be a bit out of date since it refers to RFC 2822, which has

This question already has an answer here: How to validate an email address using a regular expression? 73 answers For PHP what is the best email validation using preg , NOT ereg because it's deprecated/removed . I don't need to check if the website exists (it's not like maximum security). I've found many ways with ereg but they (obviously) aren't good practice. I suggest you use the FILTER_VALIDATE_EMAIL filter: if (filter_var($email, FILTER_VALIDATE_EMAIL)) { //valid } You can also use its regular expression directly: "/^(?!(?:(?:\\x22?\\x5C[\\x00-\\x7E]\\x22?)|(?:\\x22?[^\\x5C\\x22]\\x22?))

I have seen many examples, with many 'no, you missed something' comments. What is the right way to match an e-mail address? For Sanity sake, only fully-qualified domain names, no @localhost allowed. (or, both ways) Subdomains must be allowed (issac@deptartment.company.museum) This regular expression complies with the grammar described in RFC 2822 , it's very long, but the grammar described in the RFC is complex... It is impossible to do so in a pure regex. Regexen cannot match nested parentheses, which the full RFC spec requires. (The latest RFC on this matter is RFC5322, only released a few

I’m trying to make a html5 form that contains one email input, one check box input, and one submit input. I'm trying to use the pattern attribute for the email input but I don't know what to place in this attribute. I do know that I'm supposed to use a regular expression that must match the JavaScript Pattern production but I don't know how to do this. What I'm trying to get this attribute to do is to check to make sure that the email contains one @ and at least one or more dot and if possible check to see if the address after the @ is a real address. If I can't do this through this attribute