What would be the best way of getting contents out of parenthesis: (hello)?

I have the following:

(hello) (hello123) (hello123$pecialChars&开发者_运维技巧amp;#@)

I need a way to get the contents between the parenthesis each time. What would be a good way of doing that?

---

Well since there aren't spaces in each ( ), the following pattern should work \(([^ ]+)\)/ (match one or more of anything that isn't a space and is between parenthesis, which are escaped to be literal characters):

$data = "(hello) (hello123) (hello123$pecialChars&#@)";
preg_match_all('/\(([^ ]+)\)/', $data, $arr, PREG_PATTERN_ORDER);

// print_r($arr) gives:
Array
(
    [0] => Array
        (
            [0] => (hello)
            [1] => (hello123)
            [2] => (hello123$pecialChars&#@)
        )

    [1] => Array
        (
            [0] => hello
            [1] => hello123
            [2] => hello123$pecialChars&#@
        )

)

Edit: As mentioned, the pattern \(([^)]+)\), or match an open parenthesis followed by one or more characters that are not a close parenthesis and are followed by a close parenthesis, might be better (depending on if you might have a closing parenthesis in your data or if you might have spaces).