[英]preg_match or operator
My code below produces an error, unknown modified "|"... I'm trying to use it as the OR operator.我下面的代码产生一个错误,未知的修改“|”......我正在尝试将它用作 OR 运算符。 What is the correct way to run this code without error?
正确运行此代码的方法是什么?
$p = "(\w+)|(\()|(\))|(\,)";
$s = "sum(blue,paper,green(yellow,4,toast)))";
preg_match($p,$s, $matches);
print_r($matches);
Okay I changed it a bit... ~(\w+|\(|\)|,)~
好吧我稍微改了一下...
~(\w+|\(|\)|,)~
Now... here's the problem: I need to take that string and split it into an array like this:现在...问题来了:我需要将该字符串拆分为这样的数组:
array("sum","(","blue","paper","green","("... etc );
Can someone help me do that?有人可以帮我这样做吗? when I run the above expression it outputs an empty array....
当我运行上面的表达式时,它输出一个空数组....
Thanks谢谢
You are missing the delimiter for your pattern.您缺少模式的分隔符。
$p = "~(\w+)|(\()|(\))|(\,)~";
You're missing the delimiter as @Crayon correctly mentioned, also this pattern does the same thing: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+|[(]|[)]|,)~';
As for your (new) problem, try this :至于你的(新)问题,试试这个:
$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);
Output: Output:
Array
(
[0] => sum
[1] => (
[2] => blue
[3] => ,
[4] => paper
[5] => ,
[6] => green
[7] => (
[8] => yellow
[9] => ,
[10] => 4
[11] => ,
[12] => toast
[13] => )
[14] => )
[15] => )
)
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