Online PHP editor | output for ZXs6M

<?php $rows = [ ['`1234567890-=', '~!@#$%^&*()_+'], ['qwertyuiop[]\\', 'QWERTYUIOP{}|'], ['asdfghjkl;\'', 'ASDFGHJKL:"'], ['zxcvbnm,./', 'ZXCVBNM<>?'] ]; $wholeregex = []; foreach($rows as $k => $row) { $num = $k + 1; echo "Row $num\n"; $array = []; foreach($row as $subrow) { $subarray = array_map('ord', str_split($subrow)); $array = array_merge($subarray, $array); } sort($array); echo "\t" . implode( ' ', $array), "\n"; $ret = [$array[0]]; for($i = 1; $i < count($array); $i++) { $num = $array[$i]; if(($array[$i - 1] + 1) == $num) { if( ($i == (count($array) - 1)) || ($array[$i + 1] != ($num + 1)) ) { $ret[] = array_pop($ret) . '-' . $num; } } else { $ret[] = $num; } } echo "\t" . implode( ' ', $ret), "\n"; $regex = '(['; $subregex = implode( '', array_map(function($el) { $vals = explode('-', $el); if(count($vals) == 1) { return chr($vals[0]); } return chr($vals[0]) . '-' . chr($vals[1]); }, $ret)); $regex .= $subregex; $regex .= '])'; echo "\t" . $regex, "\n"; $wholeregex[] = $regex; } $finalregex = '%' . implode('|', $wholeregex) . '%'; $finalregex = str_replace('(-', '\(-', $finalregex); echo $finalregex, "\n"; echo strlen($finalregex), "\n"; $input = "a"; preg_match($finalregex, $input, $m); echo array_flip($m)[$input];