3v4l.org

run code in 300+ PHP versions simultaneously
<?php $kw = " asdsdfsdf \xFF as "; $pattern = '/[[:cntrl:]' . preg_quote(',!@%^*()={};~`<>?\|', '/') . ']/u'; var_dump($pattern); var_dump(var_export($pattern, true)); var_dump(preg_match($pattern, $kw));
Output for 5.3.4 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
string(46) "/[[:cntrl:],\!@%\^\*\(\)\=\{\};~`\<\>\?\\\|]/u" string(62) "'/[[:cntrl:],\\!@%\\^\\*\\(\\)\\=\\{\\};~`\\<\\>\\?\\\\\\|]/u'" bool(false)
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.3
string(46) "/[[:cntrl:],\!@%\^\*\(\)\=\{\};~`\<\>\?\\\|]/u" string(62) "'/[[:cntrl:],\\!@%\\^\\*\\(\\)\\=\\{\\};~`\\<\\>\\?\\\\\\|]/u'" int(0)

preferences:
269.28 ms | 403 KiB | 461 Q