- preg_match: documentation ( source)
<?php
$pattern = '/^[^@]+@[^@]*toyota|lexus[^@]*\.[^@]+/';
$emails = array(
'asd@abctoyotacsl.ca',
'asd@abclexuscsl.com',
'asd@toyo.com',
'asd@lexis.ca',
);
foreach($emails as $e){
echo preg_match($pattern, $e) ? 'true' : 'false';
}