What are common pitfalls in validating email addresses using regular expressions in PHP?

One common pitfall in validating email addresses using regular expressions in PHP is that the expression may not cover all valid email address formats, leading to false positives or negatives. To address this, it's recommended to use a more comprehensive regular expression pattern that adheres to the official email address specification. Additionally, it's important to consider edge cases such as internationalized email addresses. 

$email = "example@example.com";

if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
    echo "Valid email address";
} else {
    echo "Invalid email address";
}

Keywords

PHP regular expressions email validation validation errors filter_var

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