Online PHP editor | refs for BKhD4

<?php function check($w) { $t = strlen($w); if($t < 5 || $w[0] == '-' || $w[$t-1] == '-' || $w[strpos($w, "-") + 1] == '-') return false; return true; } $a = array ("safety", "safet-", "s-a-fe", "-safet", "s7-45", "s--fs"); $t1 = microtime(true); $c = 0; for ($i = 0; $i < 100000; $i ++ ){ foreach ($a as $w) { if (check($w)) $c ++; //echo $w, PHP_EOL; } } $t2 = microtime(true); echo "time without regex: ", $t2 - $t1, " n=" , $c, PHP_EOL; $t1 = microtime(true); $c = 0; for ($i = 0; $i < 100000; $i ++ ){ foreach ($a as $w) { if (preg_match('/^(?=.{5,6}$)[a-zA-Z0-9]+(?:-[a-zA-Z0-9]+)*$/', $w)) $c ++; //echo $w, PHP_EOL; } } $t2 = microtime(true); echo "time with regex: ", $t2 - $t1, " n=", $c;