$re = '/(\/\*([^*]|[\r\n]|(\*+([^*\/]|[\r\n])))*\*+\/)|(\/\/.*)/';
$str = '<?
/* This is a comment */
cout << "Hello World"; // prints Hello World
/*
* C++ comments can also
*/
cout << "Hello World";
/* Comment out printing of Hello World:
cout << "Hello World"; // prints Hello World
*/
echo "//This line was not a Comment, but ... ";
echo "http://stackoverflow.com";
echo \'http://stackoverflow.com/you can not match this line\';
array = [\'//\', \'no, you can not match this line!!\']
';
preg_match_all($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