$re = '/(?i)(?:[2-9AJKQT][hscd]){3}/mi';
$str = 'something something Ah6d8c.txt
something Qd6h7s.txt
somethingAcKhJssomething.txt
7h6c8c something.txt';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
// Print the entire match result
var_dump($matches);
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php