css attribute conditionals can break

[tenderlove]

require 'nokogiri'
require 'open-uri'

url = 'http://www.google.com/advanced_search?hl=en'
doc = Nokogiri.parse( open(url).read )

list = [
 'input[@name^="as_"]',  # okay
 'input[@name^= "as_"]', # error
 'input[@name ^="as_"]', # error
 'input[@name ^= "as_"]' # error
]

list.each do | css |
 begin
   doc.search( css )
   puts "#{css} - okay"
 rescue StandardError => e
   puts "#{css} - #{e.message}"
 end
end

[tenderlove]

making the parser return normalized strings. closed by 21c3478