Question

我的代码产生错误，未知修改“|”...我正在尝试将其用作OR运算符。运行此代码没有错误的正确方法是什么？

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

修改

好的，我稍微改了一下...... ~(\w+|$|$|,)~

现在......问题出在这里：我需要将该字符串拆分为如下数组：

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

有人可以帮我这么做吗？当我运行上面的表达式时，它输出一个空数组....

由于

Answer 1

您缺少模式的分隔符。

$p = "~(\w+)|($)|($)|(\,)~";

Answer 2

你错过了@Crayon正确提到的分隔符，这个模式也做同样的事情：

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

至于您的（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] => )
)

preg_match或运算符

修改

2 个答案: