- var_export: documentation ( source)
- preg_replace: documentation ( source)
<?php
$lines = [
"need 4 speed",
"4 speed",
"speed 4",
"4speed",
"speed4",
"speed2car",
"need 4speed",
"need4 speed",
];
var_export(
preg_replace("~(?<= |^)\d+ | \d+(?= |$)~", '', $lines)
);