Some examples taken from stack overflow:

• http://gist.github.com/heiko-braun/5b8792280bdad295e3dd9dd297b2ea16
• http://gist.github.com/heiko-braun/7a2034979274edc624e28978826b8765
• http://gist.github.com/heiko-braun/d0bf76c6dcd6ab7059ed1032619ec185
• http://gist.github.com/heiko-braun/1f1ccf95fe474fb4839796f18a242ec1
• http://gist.github.com/heiko-braun/6d8f2fa23c2354580c29922ac857ddc8
• http://gist.github.com/heiko-braun/d73ebf5b24767f7b5d7b1da8613b6de4
• http://gist.github.com/heiko-braun/1e0361839704263ffccceb35092d1964
• http://gist.github.com/heiko-braun/3f4eba0bc9ddd85302039f41b7813cca
• http://gist.github.com/heiko-braun/0f9500de4105406eef5f670dcb433a95
• http://gist.github.com/heiko-braun/a5629b7ecbfffece320f9579d1764605
• http://gist.github.com/heiko-braun/b08dcbfe8dc5bb20906f2edb0b15cbb3
• http://gist.github.com/heiko-braun/e3ee184c7c3bf014dd25cda94ee39826