php 将多个新行转换为段落

8mmmxcuj 于 2023-10-15 发布在 PHP

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我想从字符串中找到段落，并格式化它们，我有什么样的作品，但它不工作100%.
所以，我有这个字符串，看起来像这样：

##Chapter 1

Once upon a time there was a little girl named sally, she went to school.

One day it was awesome!

##Chapter 2

We all had a parade!

我正在格式化字符串，将##...转换为<H2>，它现在看起来像这样：

<h2>Chapter 1</h2>

Once upon a time there was a little girl named sally, she went to school.

One day it was awesome!

<h2>Chapter 2</h2>

We all had a parade!

现在我想把所有内容都转换成一个段落，为此我这样做：

// Converts sections to paragraphs:
$this->string = preg_replace("/(^|\n\n)(.+?)(\n\n|$)/", "<p>$2</p>", $this->string);

// To Remove paragraph tags from header tags (h1,h2,h3,h4,h5,h6,h7):
$this->string = preg_replace("/<p><h(\d)>(.+?)<\/h\d><\/p>/i", "<h$1>$2</h$1>", $this->string);

这是最终的输出（为了可读性添加了新行）：

<h2>Chapter 1</h2>
Once upon a time there was a little girl named sally, she went to school.
<p>One day it was awesome!</p>
<h2>Chapter 2</h2>
<p>We all had a parade!</p>

正如我在开头所说的，这并不是100%有效，正如你所看到的，第一段没有添加一段。如何改进正则表达式？

php

来源：https://stackoverflow.com/questions/19372458/convert-multiple-new-lines-to-paragraphs

2条答案

按热度按时间

iq0todco1#

你可以一步完成：

$this->string = preg_replace('~(*BSR_ANYCRLF)\R\R\K(?>[^<\r\n]+|<(?!h[1-6]\b)|\R(?!\R))+(?=\R\R|$)~u',
                             '<p>$0</p>', $this->string);

图案详情

(*BSR_ANYCRLF)       # \R can be any type of newline
\R\R                 # two newlines
\K                   # reset the match
(?>                  # open an atomic group
    [^<\r\n]+        # all characters except <, CR, LF
  |                  # OR
    <(?!h[1-6]\b)    # < not followed by a header tag
  |                  # OR
    \R(?!\R)         # single newline
)+                   # close the atomic group and repeat one or more times
(?=\R\R|$)           # followed by to newlines or the end of the string

赞(0）回复(0）举报 2023-10-15

qvsjd97n2#

将m开关添加到第一个正则表达式。

// Converts sections to paragraphs:
$this->string = preg_replace("/(^|\n\n)(.+?)(\n\n|$)/m", "<p>$2</p>", $this->string);

// To Remove paragraph tags from header tags (h1,h2,h3,h4,h5,h6,h7):
$this->string = preg_replace("/<p><h(\d)>(.+?)<\/h\d><\/p>/i", "<h$1>$2</h$1>", $this->string);

赞(0）回复(0）举报 2023-10-15

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php 将多个新行转换为段落

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