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Validating email addresses using regular expressions

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Here’s a fairly common code sample from Rails Applications with some sort of authentication system: If you’re experienced at Regex, this seems simple. Sections 3.2.4 and 3.4.1 of the RFC go into the requirements on how an email address needs to be formatted and, well, there’s not much you can’t do in your email address when quotes or backslashes are involved.If (like me when I first saw this) you AREN’T experienced at Regex, it takes a while to parse. The local string (the part of the email address that comes before the @) can contain any of these characters: is a valid email address. For this reason, for a time I began running any email address against the following regular expression instead: Simple, right? This is often the most I do and, when paired with a confirmation field for the email address on your registration form, can alleviate most problems with user error.Instead, the regular expression merely verifies that the top-level domain name consists of between two and twenty-four ASCII characters, with alphanumeric first and last characters and the remaining characters being either alphanumeric or a hyphen (-).If the first character is a quotation mark, match a beginning quotation mark followed by at least one occurrence of any character, followed by an ending quotation mark.I'm tired of being told my e-mail address of "foo [email protected]" is invalid.The best option is to ask the user to type their e-mail in twice and if you MUST use a regex checker, then tell the user that their e-mail address does not appear to be valid and ask if they are sure they typed it right.It seems that the checking validation of email addresses is actually two separate problems: 1- Validation of email format: Making sure if the email complies with the format and pattern of emails in RFC 5322 and if the TLD actually exists. For example, although the address Thank you for your interest in this question.Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site (the association bonus does not count).

It’s surprisingly easy, and you’re probably already doing it anyway. If you’re going to send an activation email to users, why bother using a gigantic regular expression?Even go so far as to point out WHAT did not check out in the regexp check, but do NOT stop them from submitting the form.But keep in mind that one should not rely only upon Java Script validation. This should be validated on the server side as well. They can get ridiculously convoluted as in the case above and, according to the specification, are often too strict anyway. If you actually check the Google query I linked above, people have been writing (or trying to write) RFC-compliant regular expressions to parse email addresses for years.The ending quotation mark must not be preceded by a backslash character (\).