Example of having a built in replace all utility using Regex.

replaceAll.js

(function(app) {
    
    /*----------------------------------------------------------------------------------------------
     * UTILILTY INIALIZATION
     *   This code is executed when the Javascript file is loaded
     *--------------------------------------------------------------------------------------------*/
    
    // Ensure util object exists
    app.util = app.util || {};
    // Create scoped alias to simplify references
    var util = app.util;
    
    /**
     * Escapes a string for regular expression.
     * 
     * @param {String}
     * @returns {String}
     */
    util.escapeRegExp = function(string) {
        return string.replace(/([.*+?^=!:${}()|\[\]\/\\])/g, "\\$1");
    };
    
    /**
     * Replaces all occurrences found in a string.
     * 
     * @param {String}
     * @param {String}
     * @param {String}
     * @returns {String}
     */
    util.replaceAll = function(string, find, replace) {
        return string.replace(new RegExp(util.escapeRegExp(find), 'g'), replace);
    };
})(app || {});