Jquery Contains with case-(in)sensitive

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In this post I am going to explain about jQuery Contains method with case insensitive. First small talk about jQuery, It one of the popular java script  library which is ready to use. The jQuery's tag line is "WRITE LESS, DO MORE." I feel  it is true, because we can get more functionality with less code lines. Just few days before, I worked with jQuery Selector using Contains. Contains is returns the elements which are the elements have that part of text. But, I faced a problem. For example ...