Preg_Match或运算符

我的下面的代码产生一个错误，未知修改的"|"...我正试着用它做手术室的操作员。运行此代码而不出错的正确方法是什么？

$p = "(w+)|(()|())|(,)";
$s =  "sum(blue,paper,green(yellow,4,toast)))";
preg_match($p,$s, $matches);
print_r($matches);

编辑

好的，我稍微改了一下……~(w+|(|)|,)~

现在..。问题是：我需要获取该字符串并将其拆分成如下所示的数组：

array("sum","(","blue","paper","green","(" ... etc );

有人能帮我吗？当我运行上面的表达式时，它输出一个空数组...

谢谢

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解决方案

您遗漏了@Crayon正确提到的分隔符，此模式也执行相同的操作：

$p = '~(w+|[(]|[)]|,)~';

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对于您的(新)问题，try this：

$p = '~([(),])~';
$str = 'sum(blue,paper,green(yellow,4,toast)))';
$res = preg_split($p, $str, -1, PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE);

print_r($res);

输出：

Array
(
    [0] => sum
    [1] => (
    [2] => blue
    [3] => ,
    [4] => paper
    [5] => ,
    [6] => green
    [7] => (
    [8] => yellow
    [9] => ,
    [10] => 4
    [11] => ,
    [12] => toast
    [13] => )
    [14] => )
    [15] => )
)