使用PHP中的一个preg_match_all查找多个模式 [英] Find multiple patterns with a single preg_match_all in PHP

问题描述

使用PHP和preg_match_all，我试图获取以下标记(以及标记)之间的所有HTML内容:

Using PHP and preg_match_all I'm trying to get all the HTML content between the following tags (and the tags also):

<p>paragraph text</p>
don't take this
<ul><li>item 1</li><li>item 2</li></ul>
don't take this
<table><tr><td>table content</td></tr></table>

我可以选择其中之一:

preg_match_all("(<p>(.*)</p>)siU", $content, $matches, PREG_SET_ORDER);

有没有办法获得所有

<p></p> <ul></ul> <table></table>

只包含一个preg_match_all的内容?我需要按照发现的顺序将它们显示出来，以便我可以回显内容，这才有意义.

content with a single preg_match_all? I need them to come out in the order they were found so I can echo the content and it will make sense.

因此，如果我对上述内容进行了preg_match_all，然后遍历$ matches数组，它将回显:

So if I did a preg_match_all on the above content then iterated through the $matches array it would echo:

<p>paragraph text</p>
<ul><li>item 1</li><li>item 2</li></ul>
<table><tr><td>table content</td></tr></table>

推荐答案

使用|匹配一组字符串之一:p|ul|table

Use | to match one of a group of strings: p|ul|table

使用后向引用来匹配适当的结束标记:\\2，因为组(pl|ul|table)包含第二个开始括号

Use backreferences to match the approriate closing tag: \\2 because the group (pl|ul|table) includes the second opening parenthesis

将它们放在一起:

preg_match_all("(<(p|ul|table)>(.*)</\\2>)siU", $content, $matches, PREG_SET_ORDER);

这仅在您输入的html遵循非常严格的结构时才起作用.它不能在标签中有空格，也不能在标签中具有任何属性.当有任何嵌套时，它也会失败.考虑使用html解析器来完成适当的工作.

This is only going to work if your input html follows a very strict structure. It cannot have spaces in the tags, or have any attributes in tags. It also fails when there's any nesting. Consider using an html parser to do a proper job.

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