preg_match_all 具有命名的子模式

Question

我无法理解以下表达式：

preg_match_all('/[(?P<slug>\w+\-)\-(?P<flag>(m|t))\-(?P<id>\d+)]+/', $slugs, $matches);

我的 $slugs 变量是这样的：

article-slug-one-m-111617/article-slug-two-t-111611/article-slug-three-t-111581/article-slug-four-m-111609/

Answer 1

您的表达式看起来像是试图将路径元素拆分为 slug、flag 和 id 部分。它失败了，因为括号 [ ... ] 用于匹配字符，但在这里它似乎用于将事物放在一起，如括号。它也无法使 slug 部分正确，因为它不允许超过一系列的单词 \w 和破折号 - 字符。 IE。该部分匹配 'article-' 但不匹配 'article-slug-one-'.

也许这就是你想要的？

$slugs = 'article-slug-one-m-111617/article-slug-two-t-111611/article-slug-three-t-111581/article-slug-four-m-111609/';

preg_match_all('/(?P<slug>[\w-]+)\-(?P<flag>[mt])\-(?P<id>\d+)/', $slugs, $matches);

echo "First slug : " . $matches['slug'][0], PHP_EOL;
echo "Second flag: " . $matches['flag'][1], PHP_EOL;
echo "Third ID   : " . $matches['id'][2], PHP_EOL;
print_r($matches);

输出：

First slug : article-slug-one
Second flag: t
Third ID   : 111581

Array
(
    [0] => Array
        (
            [0] => article-slug-one-m-111617
            [1] => article-slug-two-t-111611
            [2] => article-slug-three-t-111581
            [3] => article-slug-four-m-111609
        )

    [slug] => Array
        (
            [0] => article-slug-one
            [1] => article-slug-two
            [2] => article-slug-three
            [3] => article-slug-four
        )

    [1] => Array
        (
            [0] => article-slug-one
            [1] => article-slug-two
            [2] => article-slug-three
            [3] => article-slug-four
        )

    [flag] => Array
        (
            [0] => m
            [1] => t
            [2] => t
            [3] => m
        )

    [2] => Array
        (
            [0] => m
            [1] => t
            [2] => t
            [3] => m
        )

    [id] => Array
        (
            [0] => 111617
            [1] => 111611
            [2] => 111581
            [3] => 111609
        )

    [3] => Array
        (
            [0] => 111617
            [1] => 111611
            [2] => 111581
            [3] => 111609
        )

)

preg_match_all 具有命名的子模式

preg_match_all with named subpatterns

php

preg-match-all