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Editorial Team
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Asked: 2026-05-25T20:33:51+00:00

I’m creating a form in PHP that contains a field called email where the

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I’m creating a form in PHP that contains a field called email where the user needs to enter his/her email ID. In order to ensure that the mail ID entered is authentic in terms of syntax (eg. username_123@domain.com is valid) I need to append some kind of validation to it. I find the situation quite nebulous as I don’t understand how to check if the mail ID entered contains an @ symbol etc. Kindly help. Thanks. 🙂

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1 Answer

  1. Editorial Team

    Best solution is to just do:

    if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
   ...
}

    and let PHP handle the heavy work for you. Otherwise, if you want to be strictly correct and use a regex directly yourself, you’ll be stuck with this monstrosity:

    (?:[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*|"(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21\x23-\x5b\x5d-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])*")@(?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?|\[(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?|[a-z0-9-]*[a-z0-9]:(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21-\x5a\x53-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])+)\])

    for strict RFC2822 compliance.

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