define(['../lang/toString'], function(toString){

    var CAMEL_CASE_BORDER = /([a-z\xE0-\xFF])([A-Z\xC0\xDF])/g;

    /**
     * Add space between camelCase text.
     */
    function unCamelCase(str, delimiter){
        if (delimiter == null) {
            delimiter = ' ';
        }

        function join(str, c1, c2) {
            return c1 + delimiter + c2;
        }

        str = toString(str);
        str = str.replace(CAMEL_CASE_BORDER, join);
        str = str.toLowerCase(); //add space between camelCase text
        return str;
    }
    return unCamelCase;
});