在结束 HTML 标签前添加缺失的标点符号

Question

我的字符串是一个 HTML 文件。当前面没有标点符号时，我想在 HTML 结束标记之前添加一个点。标点符号是 .,?!:，我想为此使用 preg_replace。

<p>Today, not only we have so many breeds that are trained this and that.</p>

<h4><strong>We must add a dot after the closing strong</strong></h4>

<p>Hunting with your dog is a blah blah with each other.</p>

<h2>No need to change this one!</h2>

<p>Hunting with your dog is a blah blah with each other.</p>

我的函数：

$source = 'the above html';
$source = addMissingPunctuation( $source );

echo $source;

function addMissingPunctuation( $input ) {

    $tags = [ 'h1', 'h2', 'h3', 'h4', 'h5', 'h6' ];

    foreach ($tags as $tag) {

        $input = preg_replace(
            "/[^,.;!?](<\/".$tag.">)/mi",
            ".[=12=]",
            $input
        );

    }

    return $input;
}

我尝试了 .[=16=]、.[=17=]、.、.、.\0、.\1，但没有任何效果。充其量，它吞下了火柴，但没有用任何东西代替它。我的模式的匹配部分似乎适用于 regex101 和其他网站。

想要的结果是：

<p>Today, not only we have so many breeds that are trained this and that.</p>

<h4><strong>We must add a dot after the closing strong</strong>.</h4>

<p>Hunting with your dog is a blah blah with each other.</p>

<h2>No need to change this one!</h2>

<p>Hunting with your dog is a blah blah with each other.</p>

Answer 1

你不需要像那样遍历 $tags，我要么用 | 做一个 implode，要么在这种情况下只对所有规则正确可能的元素。

$source = '<p>Today, not only we have so many breeds that are trained this and that.</p>

<h4><strong>We must add a dot after the closing strong</strong></h4>

<p>Hunting with your dog is a blah blah with each other.</p>

<h2>No need to change this one!</h2>

<p>Hunting with your dog is a blah blah with each other.</p>';
$source = addMissingPunctuation( $source );
echo $source;
function addMissingPunctuation( $input ) {
    return preg_replace("/[^,.;!?]\K<\/h[1-6]>/mi", ".[=10=]", $input);
}

演示：https://3v4l.org/6dNV7

您还需要忽略元素之前的任何字符，\K 会做到这一点。 ${}是一个PHP变量，[=18=]是捕获组，以后写成[=19=]可能会更清楚。

正则表达式演示：https://regex101.com/r/xUvvuf/1/

（示例使用 [=19=]。https://3v4l.org/jGZal）

您可以采用的另一种方法是跳过所有带有标点符号的元素，这样可以减少一些步骤。

https://regex101.com/r/xUvvuf/2/

[,.;!?]<\/h[1-6]>(*SKIP)(*FAIL)|<\/h[1-6]>

您也可以更改 delimiter；不过，这是更多的个人喜好。如果你不介意转义 /s 你可以继续这样做，如果不只是交换前导和结束 / 与 ~.

演示：https://regex101.com/r/xUvvuf/3/

preg_replace("~[^,.;!?]\K</h[1-6]>~mi"

在结束 HTML 标签前添加缺失的标点符号

Adding missing punctuations before a closing HTML tag

html

php

regex

preg-replace

regex-group