Validating email format javascript

The whole purpose of the Javascript email validation should be to check for any unintentional error (like entering name instead of email).The easiest and safest way to check whether an email address is well-formed is to use PHP's filter_var() function.I have a requirement to validate an email address entered when a user comes out from the textbox.

Also, the ‘@’ must not be the first character of the email address, and the last dot must at least be one character after the ‘@’ sign.

Most email validation checks assumes that the top level domain can have up to 4 characters. You have just validated the format – not its existence.

The only way to truly validate the email address is to send an email to that address and request the user to confirm by clicking on a unique link (or entering a confirmation code)Remember, if the user’s intention is to enter an invalid email address, she can do it so easily whether you have the most tough validation or not.

\d|2[0-4]\d|25[0-5])\]))$ Of course that's lacking some sanity checks and won't do domain verification (that has to be done server side) - but it should give you a pretty solid JS email format verifier.

Validating email is a very important point while validating an HTML form.

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