- var_dump: documentation ( source)
- preg_match_all: documentation ( source)
<?php
$x = '/[^A-Za-z0-9 \r\n@£$¥èéùìòÇØøÅå\x\{0394\}\x\{03A6\}\x\{0393\}\x\{039B\}\x\{03A9\}\x\{03A0\}\x\{03A8\}\x\{03A3\}\x\{0398\}\x\{039E\}ÆæßÉ!"#$%&\'()*+,\-.\/:;<><=>?¡ÄÖÑܧ¿äöñüà^{}\\\[~\]|\x\{20AC\}]+/';
$data = 'asdf‘‼';
$tmp = [];
$result = preg_match_all($x,$data,$tmp,PREG_SET_ORDER);
var_dump($result);
var_dump($tmp);