Nokogiri:如何在输入中只允许Facebook Pixel，并删除所有HTML和脚本？

gem install nokogiri

require 'nokogiri'

def sanitize_input(input)
  doc = Nokogiri::HTML.fragment(input)
  
  # 删除所有HTML标签和脚本
  doc.xpath("//text()").remove
  
  # 仅保留包含Facebook Pixel的内容
  doc.xpath("//text()[not(ancestor::script) and not(ancestor::style)]").each do |node|
    node.content = node.content.gsub(/(?!Facebook Pixel).*/, '')
  end
  
  sanitized_input = doc.to_html
  
  return sanitized_input
end

# 示例输入
input = '<div>This is some text. <script>alert("This is a script.");</script> Facebook Pixel <p>More text.</p></div>'

# 调用sanitize_input方法进行处理
sanitized_input = sanitize_input(input)

puts sanitized_input