$re = '/^D7[5]{1}............/m';
$str = 'D74000000016CCC
D7400000001813B
D7400000001991B
D74000000019E07
D74000000019F99
D7400000001A4A4
D7400000001A53E
D7400000001A5C2
D7500000008E44C
D7500000008F94E
D750000000901B2
D75000000095FB1
D7500000009B218
D750000000A36E1
D750000000AD9AA
D750000001135DB
D75000000118DC1
D75000000119E91
D75............
D74............
';
preg_match_all($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