Online PHP editor | refs for 9ENJl

<?php $tests = [ '28{8}17{7}15{9}19[1]', '28{8}17{7}15[1]', '28{8}17[1]', '28[1]', '28{8}17[1', ]; foreach($tests as $test) { if (!preg_match_all('~^\d+(?=.+\[\d+]$)|\G(?!^)(?:{\K\d+}\d+|\[\K\d(?=]$))~', $test, $m)) { echo "invalid input"; } else { var_export( [ 'id' => array_shift($m[0]), 'quantity' => array_pop($m[0]), 'options' => array_reduce( $m[0], function($result, $string) { [$key, $result[$key]] = explode('}', $string, 2); return $result; }, [] ) ] ); } echo "\n---\n"; }