3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = [ 'net_sec1' => 'a', 'net_sec2' => 'b', 'net_sec3' => 'c', 'ss_ks_kw' => 'a', ]; $aa = preg_grep('/net_sec\d+/', $a); var_dump($aa);

preferences:
45.43 ms | 402 KiB | 5 Q