$re = '/(?m)(?<type>@param) *\K(?<scalar>(?![\$])\S+)? *\K(?<var>\$\S+) *\K(?<message>\S+.*\S+)/m';
$str = '--- Copyright @fmargerit ---
/**
* First variation with scalar type
*
* @param Int $a First parameter to add
* @param Int $b Second parameter to add
*
*/
/**
* second variation without scalar type
*
* @param $a first text
* @param $b second text
* @param $c third text
*
*/
/**
* Invalid case without message
*
* @param Int $a
*
*/
/**
* Invalid case : without variable
*
* @param Int coucou
*
*/';
preg_match_all($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