php 根据class 正则匹配DIV

以下是一个例子，可以匹配HTML中所有class为"my-class"的div标签：

$html = '<div class="my-class">This is a div with class "my-class".</div><div class="other-class">This is a div with class "other-class".</div>';

preg_match_all('/<div class="my-class".*?>.*?<\/div>/s', $html, $matches);

print_r($matches);

输出结果为：

Array
(
    [0] => Array
        (
            [0] => <div class="my-class">This is a div with class "my-class".</div>
        )

)

解释一下正则表达式：

`/<div class="my-class".*?>.*?<\/div>/s`

- `<div class="my-class"`：匹配div标签的开头，且class属性为"my-class"
- `.*?`：匹配任意字符，且尽可能少
- `<\/div>`：匹配div标签的结尾

最后的`s`修饰符表示"."也可以匹配换行符。