Question

我的PHP代码是这样的：

$str = "1. What is love? a. Haddaway b. Haxxaway c. Hassaway d. Hannaway 2. What is love 1.1? a. Haddaway b. Haxxaway c. Hassaway d. Hannaway";

echo "<pre>";
print_r(preg_split('/(?=[\d]+\.)/', $str, -1, PREG_SPLIT_NO_EMPTY));
echo "<pre/>";

输出是：

Array
    (
        [0] => 1. What is love? a. Haddaway b. Haxxaway c. Hassaway d. Hannaway 
        [1] => 2. What is love? a. Haddaway b. Haxxaway c. Hassaway d. Hannaway
    )

我正试图解决我发现的这个问题。问题是我的$ str是这样的：$str = "1. What is love 1.1? a. Haddaway b. Haxxaway c. Hassaway d. Hannaway

我得到了：

Array
(
    [0] => 1. What is love 
    [1] => 1.1? a. Haddaway b. Haxxaway c. Hassaway d. Hannaway 
    [2] => 2. What is love? a. Haddaway b. Haxxaway c. Hassaway d. Hannaway
)

我不希望“1.1”在索引[1]上，我希望它保留在索引[0]上。

我已经尝试调整我在preg_split()中使用的模式但是我没有达到我想要实现的目标......

任何人都可以就我应该做些什么提出建议吗？

Answer 1

您可以使用否定前瞻来确保DOT后面没有数字：

print_r(preg_split('/(?=\d+\.(?!\d))/', $str, -1, PREG_SPLIT_NO_EMPTY));
Array
(
    [0] => 1. What is love? a. Haddaway b. Haxxaway c. Hassaway d. Hannaway
    [1] => 2. What is love 1.1? a. Haddaway b. Haxxaway c. Hassaway d. Hannaway
)

Answer 2

在这里你可以使用边界\B，它在两个非单词字符和两个单词字符之间匹配。

$str = "1. What is love? a. Haddaway b. Haxxaway c. Hassaway d. Hannaway 2. What is love 1.1? a. Haddaway b. Haxxaway c. Hassaway d. Hannaway";
print_r(preg_split('~(?=\d+\.\B)~', $str,-1, PREG_SPLIT_NO_EMPTY));

输出：

Array
(
    [0] => 1. What is love? a. Haddaway b. Haxxaway c. Hassaway d. Hannaway 
    [1] => 2. What is love 1.1? a. Haddaway b. Haxxaway c. Hassaway d. Hannaway
)

PHP - 正则表达式 - preg_split（）

2 个答案: