From: John-John Tedro <johnjohn.tedro@...>
Date: 2011-08-23T00:03:01+09:00
Subject: Re: Regex find everything between

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On Mon, Aug 22, 2011 at 4:53 PM, Keith Raymond <raymondke99@gmail.com>wrote:

> So here's the problem:
>
> I have a html document that is being spit out to me as a string.
>
> example: "<!doctype html>\n<html lang=\"en\">\n  <head>\n</head>\n
> <body>\n  \t<header>\n  \t  <hgroup>\n  \t    <h1 class=\"my-class\">My
> page Testing</h1>\n<p class=\"my-class icon\">some text here</p>
> \t<footer>\n  \t  <p class=\"fred my-class\">This is my footer
> info</p>\n  \t</footer>\n  </body>\n</html>"
>
> I'm using regular expression to find all the opening tags of the dom
> elements.  <html lang=\"en\">, <head>, <body>, <h1 class=\"my-class\">,
> etc... and it's working. This is via scan() method.
>
> ==============================
> elements = []
> opening_tags = file.scan(/<\w+\s+[^>]*>/)
> opening_tags.each do |tag|
>  if tag.match(/class=\\"(.*?)editor(.*?)\\"/) # tries to match anything
> with a class="editor"
>    close = get_closing_tag(tag)
>      # finds which DOM element it is and returns close tag
>      # example if '<p class="my-class">' returns '</p>'
>    file.match(/#{tag}(.+)#{close}]/) { |m| elements << m }
>      # pushes all matches to elements array
>
> =======================================
>
> So I get the opening tags as it should
>  <h1 class=\my-class\"> and <p class=\"fred my-class\">
> and I get a proper closing tag for each
>  </h1> and </p>
> but /#{tag}(.+)#{close}]/ returns nothing
>
> Output from Rails.logger.info
> +++++++++++++++++++++++++++++++++++++++
> ==== tag ====
> "<h1 class=\"my-class\">"
> ==== close ====
> "</p>"
> ==== /#{tag}(.+)#{close}]/ ====
> /<p class="my-class">(.+)<\/p>]/
> ==== tag ====
> "<p class=\"my-class icon\">"
> ==== close ====
> "</p>"
> ==== /#{tag}(.+)#{close}]/ ====
> /<p class="my-class icon">(.+)<\/p>]/
> ==== tag ====
> "<p class=\"fred my-class\">"
> ==== close ====
> "</p>"
> ==== /#{tag}(.+)#{close}]/ ====
> /<p class="fred my-class">(.+)<\/p>]/
> ======= elements ========
> []
>
> +++++++++++++++++++++++++++++++++++++++
>
> Any help would be appreciated.  I'm at my wits end here.  If there is  a
> completely better way to do this, I'm all ears as well.
>
> Thank you in advance.
>
> --
> Posted via http://www.ruby-forum.com/.
>
>
Try out nokogiri: https://github.com/tenderlove/nokogiri

After you've let it parse your document you can use css3 or xpath selectors
to find what you are looking for.

Letting someone else do all the dirty work is a good idea for potentially
dirty html.

-- John-John Tedro

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