$re = '/(?s-i)\A(?!.*\QCopyright MyCompany Ltd. All Rights Reserved\E).+/m';
$str = '// Just add a typo to the copyright text below for the regex to pick it up.
// JetBrains Rider uses .PCRE2 regex.
/********************************************************
* Copyright MyCompany Ltd. All Rights Reserved *
*********************************************************/
#pragma once
insert code here';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
// Print the entire match result
var_dump($matches);
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php