this will check e-mail if they are valid e-mail, it just checks for illigal caracters and if ther is a @ and a . in the right place and stuff
PHP Example :
<?php
function check_email_address($email) {
// First, we check that there's one @ symbol, and that the lengths are right
if (!ereg("[^@]{1,64}@[^@]{1,255}", $email)) {
// Email invalid because wrong number of characters in one section, or wrong number of @ symbols.
return false;
}
// Split it into sections to make life easier
$email_array = explode("@", $email);
$local_array = explode(".", $email_array[0]);
for ($i = 0; $i < sizeof($local_array); $i++) {
if (!ereg("^(([A-Za-z0-9!#$%&'*+/=?^_`{|}~-][A-Za-z0-9!#$%&'*+/=?^_`{|}~\.-]{0,63})|(\"[^(\\|\")]{0,62}\"))$", $local_array[$i])) {
return false;
}
}
if (!ereg("^\[?[0-9\.]+\]?$", $email_array[1])) { // Check if domain is IP. If not, it should be valid domain name
$domain_array = explode(".", $email_array[1]);
if (sizeof($domain_array) < 2) {
return false; // Not enough parts to domain
}
for ($i = 0; $i < sizeof($domain_array); $i++) {
if (!ereg("^(([A-Za-z0-9][A-Za-z0-9-]{0,61}[A-Za-z0-9])|([A-Za-z0-9]+))$", $domain_array[$i])) {
return false;
}
}
}
return true;
}
?>
Usage Example :
PHP Example :
<?php
include("emailcheck.php");
$email = $_POST['email'];
if (check_email_address($email)) {
echo $email . 'is a valid email address.';
} else {
echo $email . ' is not a valid email address.';
}
?>
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