What is the exact format of an email address according to RFCs?

The exact format of an email address according to RFCs is as follows: it consists of two parts separated by an "@" symbol. The local part can contain alphanumeric characters, special characters, and periods, while the domain part can contain alphanumeric characters and periods. Additionally, the domain part must have at least one period and cannot start or end with a period. 

$email = "example@example.com";

if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
    echo "Email address is valid.";
} else {
    echo "Email address is not valid.";
}

Keywords

email address format RFCs validation PHP

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