I'd suggest using jquery to easily get the elements by class name and identify those with the search value. Something like:

var searchValue = bear;



$(.ClassName).each(function(){

  if($(this).html().indexOf(searchValue) > -1){

     //match has been made

  }

});

if you are restricted to vanilla javascript, here is an example:

var els = document.getElementsByClassName(ClassName);

var searchValue = bear;



for(var i = 0; i < els.length; i++){

  if(els[i].innerHTML.indexOf(searchValue) > -1){

    //match has been made   

  }

}

I think what you are really looking for is the comparitor String.indexOf(SearchValue) > -1, which will identify if the content of the element is a match for the string you are looking for. Note that it is case-sensitive.