Compare two URL's content
-
Reference: http://zebardast.ir/en/how-to-get-pure-content-from-html-page-in-java-via-regex/
-
boilerpipe http://code.google.com/p/boilerpipe/wiki/QuickStart
-
google-diff-match-patch http://code.google.com/p/google-diff-match-patch/wiki/API
-
Demo: https://neil.fraser.name/software/diff_match_patch/svn/trunk/demos/demo_diff.html