Add a string inside a specific part of a string

Question

I have a string that looks like this:

<script> some random script, maybe even some line breaks\ </script>

or even

<script type="random/type" src="https://even_a_source.com"> random scripts </script>

I would like to insert a class tag in the script part, like this:

<script class="addMe" type="random/type" src="https://even_a_source.com"> random scripts </script>

without changing the rest of the script tag.

I figured using regex would be a good start: /<[^>]*>/ matches <script> and </script> I think but I didn't progress further unfortunately.

As mentioned in the comments, using the gem nokogiri might be easier to deal with this, I'm trying it right now and update this if I find the solution.

Using regex for processing html/xml is generally considered a bad idea. Use something like nokogiri instead: github.com/sparklemotion/nokogiri — TookieWookie
– TookieWookie, Commented May 20, 2020 at 15:50
Thanks, I'm looking at the docs right now and I see that you can modify attributes with this gem. I'll try this and keep this thread updated! — victorfink
– victorfink, Commented May 20, 2020 at 15:55
I personally think this question wouldn't be facing a close vote if it contained some actual ruby code — boulder_ruby
– boulder_ruby, Commented May 20, 2020 at 17:05

Yakov · Accepted Answer · 2020-05-20 16:05:45Z

1

With nokogiri you can manipulate it easily:

doc = Nokogiri.parse('<script> some random script, maybe even some line breaks\ </script>')
doc.children.first.set_attribute('type', 'random/type')
doc.children.to_s

=> "<script type=\"random/type\"> some random script, maybe even some line breaks\\ </script>"

answered May 20, 2020 at 16:05

Yakov

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Comments

victorfink · Accepted Answer · 2020-05-20 16:06:14Z

0

This is really easy using Nokogiri gem.

After installing the gem here is the code that worked for me:

require 'nokogiri'

@doc = Nokogiri::HTML::DocumentFragment.parse <<-EOHTML

<script>
    random scripts
</script>
EOHTML

script  = @doc.at_css "script"
script['class'] = 'addMe'

puts @doc.to_html

This outputs the following in the console:

<script class="addMe">
    random scripts
</script>

I just have to figure out a way to fit this in my code but this shouldn't be a problem.

This closes the question.

answered May 20, 2020 at 16:06

victorfink

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