Online PHP editor | refs for FZjkl

<?php $text = <<<TEXT SU4R C45G G3HD 61U14XE7AR23 914K16W471LV V6SQ5V16LG91 24YL4HW956C3 UZ26J12K615V T741MH4N739W 31ST445G726H 621EH6VW7Q6M 55N629WJ945P 56TX2W6LC949 44DS765CF739 XC262HV1JZ6V 26YD4N1Y71F7 S4M3F1XeDC0D TEXT; preg_match_all( '/\b(?:[a-z\d]{4}(?:[a-z\d]{8})?)\b/i', $text, $matches ); var_export($matches[0]);