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<?php $x = '[^A-Za-z0-9 \r\n@£$¥èéùìòÇØøÅå\u0394_\u03A6\u0393\u039B\u03A9\u03A0\u03A8\u03A3\u0398\u039EÆæßÉ!"$%&amp;\'()*+,\-./:;<>&lt;=&gt;?¡ÄÖÑܧ¿äöñüà^{}\\\[~\]|\u20AC]+'; var_dump($x); $x = preg_quote($x,'#'); $data = 'asdf‘‼'; $tmp = []; $result = preg_match($x,$data,$tmp); var_dump($result); var_dump($tmp);
Output for 7.1.6
string(186) "[^A-Za-z0-9 \r\n@£$¥èéùìòÇØøÅå\u0394_\u03A6\u0393\u039B\u03A9\u03A0\u03A8\u03A3\u0398\u039EÆæßÉ!"$%&amp;'()*+,\-./:;<>&lt;=&gt;?¡ÄÖÑܧ¿äöñüà^{}\\[~\]|\u20AC]+" Warning: preg_match(): Delimiter must not be alphanumeric or backslash in /in/liDdG on line 7 bool(false) array(0) { }