How do I do a regex search in Nokogiri for text that matches a certain beginning?

Question

Given:

require \'rubygems\'
require \'nokogiri\'
value = Nokogiri::HTML.parse(<<-HTML_END)
\"

  
A

        

Answer 1

And some docs you're seeking:

• Nokogiri: http://nokogiri.org/
• XPath: http://www.w3.org/TR/xpath20/
• CSS3 Selectors: http://www.w3.org/TR/selectors/

Answer 2

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/]")

Answer 3

Use the xpath function starts-with:

value.xpath('//p[starts-with(@id, "para-")]').each { |x| puts x['id'] }

Answer 4

divs = value.css('div[id^="para-"]')