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Validating email address form

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The whole purpose of the Javascript email validation should be to check for any unintentional error (like entering name instead of email).

If your HTML form accepts an email field, it is a good practice to validate the email before the form is submitted.

Validating email address using regular expressions is tricky and is often not recommended. A valid email address as defined by RFC 2822 can be quite complex.

A valid email is of the format: [email protected] The name can be a set of ‘atoms’ separated by dots. single or double quotes and any character inside the quotes Now, to the domain part. MUSEUM .travel, .international or even .vermögensberatung For example all the following email addresses are valid: Source The sad truth is that despite the complex regular expression validation, the email may not be existing, so can still be invalid for practical purposes.

The truth is that none of us filling in forms — there is a lot of evidence to show that users get annoyed by forms, and are one of main things that will cause them to leave and go somewhere else if they are done badly. We want to make filling out web forms as non-horrible as possible, so why do we insist on blocking our users at every turn?

There are three main reasons: In the real world, developers tend to use a combination of client-side and server-side validation, to be on the safe side.

Sending data is not enough — we also need to make sure that the data users fill out in forms is in the correct format we need to process it successfully, and that it won't break our applications.

We also want to help our users to fill out our forms correctly and don't get frustrated when trying to use our apps.

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In some cases they also limit which addresses it is possible to send mail to.

It is also mandatory to re-validate all user input, including emails for validity at the serverside.

In case you are using Node.js, you can use the same regular expression function below to validate emails both on the clientside and the serverside.

This article uses the term email address to refer to the addr-spec defined in RFC 5322, not to the address that is commonly used; the difference is that an address may contain a display name, a comment, or both. [email protected] made up of a local-part, an @ symbol, then a case-insensitive domain.

Although the standard specifies the local part to be case-sensitive, in practice the mail system at may treat John.