PHP-REGEX - 多项选择类型

Question

我有这样一个字符串:

$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"

我想要做的是得到这样的输出并将每个问题存储到 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 

截至目前，我为正则表达式创建了这个编造的代码(仍然是新手，抱歉!)

$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>";

输出是这样的，它存储在一个 div 中:

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

我对如何区分每个问题以及如何在每个选择上放置一个 div 感到困惑...任何人都可以就我该怎么做提供一些建议吗？

Answer 1

您可以像这样使用 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]+\.) 是一个前瞻，当其后跟数字或字母 a 加上一个点时拆分。