$re = '/(--.*$|\/\*[\s\S]*?\*\/)/m';
$str = '-- fdf
fdf
sdfdsf /* fsdf /* */ other /* */ sdfsdf
isdf -- sdf
/* fd */
/*
multiline
*/
more here
/* dangling
-- ${here} more ${another} blah
/* ${you} */ ${yeah}
';
preg_match_all($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