How do I do a regex search in Nokogiri for text th

2019-03-12 01:07发布

站内问答 / Ruby
353 4 4

Given: 

require 'rubygems'
require 'nokogiri'
value = Nokogiri::HTML.parse(<<-HTML_END)
"<html>
<body>
  <p id='para-1'>A</p>
  <div class='block' id='X1'>
    <h1>Foo</h1>
    <p id='para-2'>B</p>
  </div>
  <p id='para-3'>C</p>
  <h2>Bar</h2>
  <p id='para-4'>D</p>
  <p id='para-5'>E</p>
  <div class='block' id='X2'>
    <p id='para-6'>F</p>
  </div>
</body>
</html>"
HTML_END

I want to do something like what I can do in Hpricot:

divs = value.search('//div[@id^="para-"]')
  1. How do I do a pattern search for elements in XPath style?
  2. Where would I find the documentation to help me? I didn't see this in the rdocs.

4条回答
兄弟一词,经得起流年.
2楼-- · 2019-03-12 01:40

And some docs you're seeking:

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一纸荒年 Trace。
3楼-- · 2019-03-12 01:44 
Nokogiri::XML::Node.send(:define_method, 'xpath_regex') { |*args|
  xpath = args[0]
  rgxp = /\/([a-z]+)\[@([a-z\-]+)~=\/(.*?)\/\]/
  xpath.gsub!(rgxp) { |s| m = s.match(rgxp); "/#{m[1]}[regex(.,'#{m[2]}','#{m[3]}')]" }
  self.xpath(xpath, Class.new {
    def regex node_set, attr, regex
      node_set.find_all { |node| node[attr] =~ /#{regex}/ }
    end
  }.new)
}

Usage:

divs = Nokogiri::HTML(page.root.to_html).
  xpath_regex("//div[@class~=/axtarget$/]//div[@class~=/^carbo/]")
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▲ chillily
4楼-- · 2019-03-12 01:48

Use the xpath function starts-with:

value.xpath('//p[starts-with(@id, "para-")]').each { |x| puts x['id'] }
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走好不送
5楼-- · 2019-03-12 01:56 
divs = value.css('div[id^="para-"]')
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