Search Engine with jQuery :contains()

Question

I'm working on a project that requires a simple search engine. The idea is not to use plugins like "autocomplete" and "jquery ui" but to exploit the ":contains()" jQuery method.

Now, this function does exactly what I'm talking about.

$('#search').on('keyup',function(){

    var v = $(this).val();

    $('.element').hide();
    $(".element:contains('"+v+"')").show();


});

The problem is, if a term is called "Foo" and I searching for "foo", the search engine do not returns any results... rightly. So I ask you if there is a way to solve this problem... using only jQuery.