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<?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!"#$%&amp;\'()*+,\-.\/:;<>&lt;=&gt;?¡ÄÖÑܧ¿äöñüà^{}\\\[~\]|\u20AC]+/'; #var_dump($x); $x = '/\x{0394}/'; $data = 'asdf‘‼'; $tmp = []; $result = preg_match($x,$data,$tmp); var_dump($result); var_dump($tmp);
Output for 7.1.6
Warning: preg_match(): Compilation failed: character value in \x{} or \o{} is too large at offset 7 in /in/heDIA on line 7 bool(false) array(0) { }