PHP:括号内用逗号分隔 [英] PHP: Explode comma outside of brackets

问题描述

下面是我尝试仅在第一组括号之外的逗号爆炸的字符串.

Below is a string I've tried to explode only on comma's outside of the first set of brackets.

小麦粉(2％)[小麦粉，小麦面筋，碳酸钙，铁，烟酸(B3)，硫胺素(B1)，抗坏血酸]，水，酵母，盐，植物油(棕榈，菜籽油)，油(向日葵，油菜籽))，大豆粉

preg_split("/[\[\]|()]+/", "Wheat Flour (2%) [Wheat Flour, Wheat Gluten, Calcium Carbonate, Iron, Niacin (B3), Thiamin (B1), Ascorbic Acid], Water, Yeast, Salt, Vegetable Oils (Palm, Rapeseed, oils (sunflower, rapeseed)), Soya Flour", -1, PREG_SPLIT_NO_EMPTY);

哪个返回:

[0] => Wheat Flour 
[1] => 2%
[2] => Wheat Flour, Wheat Gluten, Calcium Carbonate, Iron, Niacin 
[3] => B3
[4] => , Thiamin 
[5] => B1
[6] => , Ascorbic Acid
[7] => , Water, Yeast, Salt, Vegetable Oils 
[8] => Palm, Rapeseed
[9] => , Soya Flour

第二次尝试

preg_split('/\|(?![^(]*\))/', "Wheat Flour (2%) [Wheat Flour, Wheat Gluten, Calcium Carbonate, Iron, Niacin (B3), Thiamin (B1), Ascorbic Acid], Water, Yeast, Salt, Vegetable Oils (Palm, Rapeseed, oils (sunflower, rapeseed)), Soya Flour");

返回:

[0] => Wheat Flour (2%) [Wheat Flour, Wheat Gluten, Calcium Carbonate, Iron, Niacin (B3), Thiamin (B1), Ascorbic Acid], Water, Yeast, Salt, Vegetable Oils (Palm, Rapeseed), Soya Flour

第一次尝试是最接近我要获取的以下输出.

The first attempt is the closest I've been able to get to the below output I'm trying to get.

[0] => "Wheat Flour (2%) [Wheat Flour, Wheat Gluten, Calcium Carbonate, Iron, Niacin (B3), Thiamin (B1), Ascorbic Acid]"
[1] => "Water"
[2] => "Yeast"
[3] => "Salt"
[4] => "Vegetable Oils (Palm, Rapeseed, oils (sunflower, rapeseed))"
[5] => "Soya Flour"

推荐答案

您可以使用此PCRE正则表达式进行拆分:

You may use this PCRE regex for splitting:

(?:(\((?:[^()]*|(?-1))*\))|(\[(?:[^][]*|(?-1))*\]))(*SKIP)(*F)|\h*,\h*

RegEx演示

代码:

$s = 'Wheat Flour [Wheat Flour, Wheat Gluten, Calcium Carbonate, Iron, Niacin (B3), Thiamin (B1), Ascorbic Acid], Water, Yeast, Salt, Vegetable Oils (Palm, Rapeseed, oils (sunflower, rapeseed)), Soya Flour';
$re = '~(?:(\((?:[^()]*|(?-1))*\))|(\[(?:[^][]*|(?-1))*\]))(*SKIP)(*F)|\h*,\h*~';

print_r(preg_split($re, $s));

输出:

Array
(
    [0] => Wheat Flour [Wheat Flour, Wheat Gluten, Calcium Carbonate, Iron, Niacin (B3), Thiamin (B1), Ascorbic Acid]
    [1] => Water
    [2] => Yeast
    [3] => Salt
    [4] => Vegetable Oils (Palm, Rapeseed, oils (sunflower, rapeseed))
    [5] => Soya Flour
)

正则表达式说明:

• (?::启动非捕获组
  • (\((?:[^()] * |(?-1))* \)):递归模式以匹配可能嵌套的(...)子字符串
  • | :或
  • (\ [(?:[^] [] * |(?-1))* \]):递归模式以匹配可能嵌套的 [...] 子字符串
  • (?:: Start non-capture group
    • (\((?:[^()]*|(?-1))*\)): Recursive pattern to match a possibly nested (...) substring
    • |: OR
    • (\[(?:[^][]*|(?-1))*\]): Recursive pattern to match a possibly nested [...] substring

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