正则表达式替换 <br /> 之间 <p> 和 </p>

Question

我有一个包含许多<p>标记和其他html标记的html字符串。

如何在<p>和</p>标记之间替换<br />标记，以便使用正则表达式将其变为多个段落？

（我只需要替换<p>标记，而不是其他标记）

样本来源：

<p> This is a paragraph without line break</p>
<p> This is a paragraph with <br /> line <br /> break</p>

样本输出：

<p> This is a paragraph without line break</p>
<p> This is a paragraph with </p><p> line </p><p> break</p>

Answer 1

<?php

$string = '<p> This is a paragraph without line break</p>
text <br /> without p <br />
<p> This is a paragraph with <br /> line <br /> break</p>
<p>aaaa <br /></p>
dsa<br />
<p><br /></p>';

// Start non-greedy search for text in paragraphs
preg_match_all('/<p>.*?<\/p>/im', $string, $matches);

$matches = $matches[0];

// for each match replace <br /> inside text
foreach ($matches as $key => $match) {
    $replaced[$key]['initial'] = $match;
    $replaced[$key]['replaced'] = str_replace('<br />', '</p><p>', $match);
}

// replacing initial parts of text with replaced parts
foreach ($replaced as $key => $replacePair) {
    $string = str_replace($replacePair['initial'], $replacePair['replaced'], $string);
}

print_r ($string);

沙盒代码

Answer 2

使用PHP函数str_replace。 它将替换所有“ br”标签。 像这样使用它：

$result = str_replace('<br />', '', $input);