Jquery - Change/Replace All Css Class Names Inside a Parent

Use the below to change all the class names inside a parent

function replaceCSSClass()

{

    // Parent ID name

    var parentElement = "#divParentID"

    // Class Name, It is used to get classes that needs to be replaced.

    var selector= ".className"

    //Get All Elements

    var elements = jQuery(parentElement).find(selector);

    //Here 'oldClassName' is going to be replaced by 'className'

    jQuery.each(elements, function () {

        this.setAttribute

        (

            'class', 

            this.getAttribute('class').replace(/(?:^|\s)oldClassName(?!\S)/g, ' className')

        );

    });

}