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Editorial Team
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Asked: 2026-05-27T17:57:06+00:00

I am trying to create a simple blog that has code inclosed in <pre>

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I am trying to create a simple blog that has code inclosed in <pre> tags.

I want to display “read more” after the first closing </pre> tag is encountered, thus showing only the first code segment.

I need to display all text, HTML, code up to the first closing </pre> tag.

What I’ve come up with so far is the follow:

 /^(.*<\/pre>).*$/m

However, this matches every closing </pre> tag up to the last one encountered.

I thought something like the following would work:

 /^(.*<\/pre>{1}).*$/m

It of course does not.

I’ve been using Rubular.

My solution thanks to your guys help:

 require 'nokogiri'

 module PostsHelper
def readMore(post)
    doc = Nokogiri::HTML(post.message)
    intro = doc.search("div[class='intro']")
    result = Nokogiri::XML::DocumentFragment.parse(intro)
    result << link_to("Read More", post_path(post))
    result.to_html
end
 end

Basically in my editor for the blog I wrap the blog preview in div class=intro
Thus, only the intro is displayed with read more added on to it.

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1 Answer

  1. Editorial Team

    This is not a job for regular expressions, but for a HTML/XML parser.

    Using Nokogiri, this will return all <pre> blocks as HTML, making it easy for you to grab the one you want:

    require 'nokogiri'

html = <<EOT
<html>
  <head></head>
  <body>
    <pre><p>block 1</p></pre>
    <pre><p>block 2</p></pre>
  </body>
</html>
EOT

doc = Nokogiri::HTML(html)
pre_blocks = doc.search('pre')
puts pre_blocks.map(&:to_html)

    Which will output:

    <pre><p>block 1</p></pre>
<pre><p>block 2</p></pre>
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