What potential issue is the user facing with email validation in the PHP script?

The potential issue the user is facing with email validation in the PHP script is that the regular expression used for validation may not be accurate or robust enough to catch all valid email formats. To solve this issue, it is recommended to use PHP's built-in filter_var function with the FILTER_VALIDATE_EMAIL filter option for reliable email validation. 

$email = "test@example.com";

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

Keywords

email validation PHP script regular expression filter_var validation error

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