- preg_match_all: documentation ( source)
<?php
$x = '[^A-Za-z0-9 \r\n@£$¥èéùìòÇØøÅå\u0394_\u03A6\u0393\u039B\u03A9\u03A0\u03A8\u03A3\u0398\u039EÆæßÉ!"#$%&\'()*+,\-./:;<><=>?¡ÄÖÑܧ¿äöñüà^{}\\\[~\]|\u20AC]+';
$data = 'asdf‘';
$tmp = [];
$result = preg_match_all($x,$data,$tmp);