jQuery - remove special characters

jQuery - remove special characters http://stackoverflow.com/questions/33032730/select-class-using-other-elements-text-with-jquery/33033263#33033263

HTML

<select id="element" size="0">
    <option></option>
    <option value="8">classA</option>
    <option value="9">classB</option>
    <option value="7">classC</option>
    <option value="6" selected="selected">classD</option>
</select>
<div class="hidden classD">test</div>
<div id='result'></div>

CSS

.hidden {
    display:none;
}

JavaScript

String.prototype.removeSpecialChars() = function() {
		return this.replace(/[^\w\s]/gi, '');

}

String.prototype.foo = function() {
    return this + "+";
}


$('document').ready(function ($) {

    var className;
   // here
   className = $('#element option:selected').text();
   alert(className);
   className = $('#element option:selected').text().replace(/[^a-z0-9\s]/gi, '');
    var $el = $('.' + className);
	alert(className);
    $el.removeClass('hidden');
    
    var test2 = "L.T.D. & Assoc.//";
    
    $('#result').html(test2.removeSpecialChars());

});