Nokogiri is a an HTML, SAX, XML, and Reader parser available on multiple open-source operating systems. Nokogiri also allows you to search document with XPath or CSS3 selectors. You can find out how to download it at the link below.
Because Nokogiri needs to be compiled and dynamically linked against both libxml2 and libxslt, it has gained a reputation for being complicated to install.As of Nokogiri 1.6,
libxml2andlibxsltsource code is bundled with Nokogiri, and compiled at gem-install-time. The instructions in this document should work for all versions 1.6.4 and later.(If you need support for installing earlier versions of Nokogiri, you may want to take a look at the git history for this document.)
Get Nokogiri here: http://www.nokogiri.org/tutorials/installing_nokogiri.html#freebsd
