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我想从一个字符串中找到段落，并格式化它们，我有什么作品，但它不能 100% 工作。

所以，我有这个看起来像这样的字符串：

##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，通过转换##...为<H2>'s，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!

现在我想将所有内容转换为一个段落，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);

这是最终输出（为便于阅读添加了新行）：

<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那样，这不是 100% 有效的，而且正如你所看到的，第一段没有添加一个段落。我可以做些什么来改进正则表达式？

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2 回答 2

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您可以一步完成：

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

图案细节

(*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
于 2013-10-15T02:53:51.327 回答
0

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);
于 2013-10-15T03:04:42.103 回答