gistfile1.js

// Remove classes that have given prefix
// Example: 
// You have an element with classes "apple juiceSmall juiceBig banana"
// You run:
// $elem.removeClassPrefix('juice');
// The resulting classes are "apple banana"

// NOTE: discussion of implementation techniques for this, including why simple RegExp with word boundaries isn't correct: 
// http://stackoverflow.com/questions/57812/jquery-remove-all-classes-that-begin-with-a-certain-string#comment14232343_58533

(function ( $ ) {

$.fn.removeClassPrefix = function (prefix) {
    this.each( function ( i, it ) {
        var classes = it.className.split(" ").map(function (item) {
           return item.indexOf(prefix) === 0 ? "" : item;
        });
        it.className = classes.join(" ");
    });

    return this;
}

})( jQuery );