PHP-REGEX - 多选类型 [英] PHP-REGEX - Multiple Choice Type

问题描述

我有一个这样的字符串：

I have a string like this:

$str = "1. What is love? a. Haddaway b. Haxxaway c. Hassaway d. Hannaway 2. What is love? a. Haddaway b. Haxxaway c. Hassaway d. Hannaway"

我想要做的就是有一个这样的输出并将每个问题存储到 div ：

What I want to do is to have an output like this and store each question to a div:

1. What is love? 
a. Haddaway b. Haxxaway c. Hassaway d. Hannaway 

2. What is love? 
a. Haddaway b. Haxxaway c. Hassaway d. Hannaway 

到目前为止，我为regex创建了这个化妆代码（仍然是新手，对不起）

As of the moment, I created this made-up code for regex (still a newbie, sorry!)

$str = "1. What is love? a. Haddaway b. Haxxaway c. Hassaway d. Hannaway 2. What is love? a. Haddaway b. Haxxaway c. Hassaway d. Hannaway"
$repl = preg_replace('#(\d+:.*?)(?=\d+:|$) *#', "$1", $str);
echo "<div>$repl</div>";

输出是这个，它存储在单个 div ：

And the output is this and it's stored on a single div:

1. What is love? a. Haddaway b. Haxxaway c. Hassaway d. Hannaway 2. What is love? a. Haddaway b. Haxxaway c. Hassaway d. Hannaway

我很困惑如何区分每个问题以及如何将 div 每个选项...任何人都可以给我一些建议我该怎么办？

I'm confused on how to separate each question and how to put a div on each choice... can anyone give some advice on what should I do?

推荐答案

您可以使用 preg_split ：

$str = "1. What is love? a. Haddaway b. Haxxaway c. Hassaway d. Hannaway 2. What is love? a. Haddaway b. Haxxaway c. Hassaway d. Hannaway";

print_r(preg_split('/(?=[a\d]+\.)/', $str, -1, PREG_SPLIT_NO_EMPTY));
Array
(
    [0] => 1. What is love?
    [1] => a. Haddaway b. Haxxaway c. Hassaway d. Hannaway
    [2] => 2. What is love?
    [3] => a. Haddaway b. Haxxaway c. Hassaway d. Hannaway
)

（？= [a\d] + \。）在号或字母a 加上DOT之后分割。

(?=[a\d]+\.) is a lookahead that splits when followed by number or letter a plus a DOT.

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