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ereg("^[a-zA-Z0-9_]+@[a-zA-Z0-9-]+.[a-zA-Z0-9-.]+$]", $email)

<?php
function validate_mail($address) {
	if (!ereg("^[^@]{1,64}@[^@]{1,255}$", $address)) return false;
	else {
		$email_parts = explode('@', $address, 2);
		$domain_parts = explode('.', $email_parts[1]);
		for ($i = 0; $i < count($local_array); $i++) {
			if (!ereg("^(([A-Za-z0-9!#$%&'*+/=?^_`{|}~-][A-Za-z0-9!#$%&'*+/=?^_`{|}~.-]{0,63})|("[^(\|")]{0,62}"))$",
			$local_array[$i])) {
				$returned = true;
				return false;
			} 
		}
		if (empty($returned) && (ereg("^[?[0-9.]+]?$", $email_parts[1]) || count($x = explode('.', $email_parts[1])) < 2)) {
			return false;
		}
		else {
			for ($i = 0; $i < count($domain_array); $i++) {
				if (!ereg("^(([A-Za-z0-9][A-Za-z0-9-]{0,61}[A-Za-z0-9])|([A-Za-z0-9]+))$", $domain_parts[$i])) {
					$returned = true;
					return false;
				}
			}
		}
		if (empty($returned)) return true;
	}
}
?>

<?php
function valemail($address, $username, $password, $dir='validations') {
	if (!ereg("^[^@]{1,64}@[^@]{1,255}$", $address)) return false;
	else {
		if (empty($username) || empty($password)) return false;
		else {
			$filename = $username . md5($address);
			$key = sha1($filename);
			$fp = fopen($dir . '/' . $key, 'w');
			fputs($fp, base64_encode("INSERT INTO `users` (`id`, `name`, `email`, `password`) VALUES (NULL, '" . 
			$username . "', '" . $address . "', '" . $password . "')"));
			fclose($fp);
			$headers = "From: you@domain.suffix <group youdomain>rn" .
				   	   "Reply-to: reply@domain.suffixrn";
			$content = "Thank you for signing up at our website.rn" . 
				   	   "In order for you to login to your account, you will first need to activate your account.rnrn" .
				   	   "Please verify that the following information is correct before you continue:rn" . 
				   	   "Account: " . $username . "rn" .
				   	   "Password: " . $password . "rn" . 
				   	   "rnIf all of the above information is correct, please continue by following the link below.rn" . 
				   	   $validate_link . "(<a href="" . $validate_link . "">AOL</a>)rnrn" . 
				   	   "If you did not create this account, please follow the link below.rn" . 
				   	   $suspend_link . "(<a href="" . $suspend_link . "">AOL</a>)rnrnrn" . 
				   	   "Regards,rn" . 
				   	   "YourDomain";
			$mail = mail($address, 'Account Signup: ' . $username, $content, $headers);
			if (!empty($mail)) return false;
			else return true;
		}
	}
}
?>

<?php
function valaccount($key, $dir='validations', $suspend=false) {
	if (strlen($key) != 32 || empty(file_exists($dir . '/' . $key))) return false;
	else if (!empty($suspend)) {
		unlink($dir . '/' . $key);
		return true;
	}
	else {
		$fp = fopen($dir . '/' . $key, 'r');
		$contents = '';
		while(!feof($fp)) $contents .= fgets($fp, 1024);
		fclose($fp);
		unlink($dir . '/' . $key);
		$contents = base64_decode($contents);
		$split = explode('_.', $contents);
		if ($split[0] <= (time()-1800)) return false;
		else {
			$query = mysql_query($split[1]);
			if (!empty($query)) return true;
			else return false; 
		}
	}
}
?>

<?php
if (!empty($_POST['address'])) {
	exit('<p>The following email address is <b>' . 
	     ((!valmail($_POST['address'])) ? 'Invalid' : 'Valid') . 
	     '</b>!<br>' . 
		 $_POST['address'] . '</p>');
}

echo '<p><form method="post">
	  Email: <input name="address"><br>
	  <input type="submit" value="validate">
	  </form></p>';
?>

<?php
if (!empty($_POST['address'])) {
	$result = valemail($_POST['address'], htmlspecialchars($_POST['name']), $_POST['password']);
	if (empty($result)) echo 'We were unable to verify your email address.';
	else echo 'We have sent an email to the address you specified, please review the message and follow the instructions.';
}
else if (count($url = explode(':', $_SERVER['QUERY_STRING'])) == 2) {
	switch ($url[0]) {
		case 'act' : 
				$result = valaccount($url[1]);
				if (empty($result)) {
					echo 'You have supplied an invalid activation key, ' . 
					'or you activation has expired.';
				}
				else {
					echo 'Your account has been activated!<br>You may no' . 
					'w proceed to the login page.';
				}
				break;
		case 'spd' : 
				$result = valaccount($url[1], 'validations', true);
				if (empty($result)) {
					echo 'You have supplied an invalid activation key, ' . 
					'or you activation has expired.';
				}
				else echo 'Your account has been deleted.';
				break;
		default : echo 'Invalid request.'; break;
	}							 
}
else {
	echo '<p><form method="post">
	 	 Name: <input name="name"><br>
	 	 Password: <input name="password"><br>
	 	 Email: <input name="address"><br>
	 	 <input type="submit" value="validate">
	 	 </form></p>';
}
?>