$re = '/(({FUNC\s+(.+?)}|{\/FUNC}))/mi';
$str = '{FUNC name_of_func}
text
text
text
{FUNC name_of_func2}text 2{/FUNC}
text
text
{/FUNC}';
preg_match_all($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