Using AngularJS, this method takes a string bound in the UI and replaces it as required

AngularJS Replace String Filter

// Usage 
// {{myIntValue | number:0 | replacestringfilter:',':'.'}}
// {{myStringValue | replacestringfilter:'ABC':'DEF'}}
myApp.filter('replacestringfilter', function () {
  return function (item, oldstring, newstring) {
    if (!item)
      return item;
    var sItem = item.toString();
    var find = oldstring;
    var re = new RegExp(find, 'g');
    sItem = sItem.replace(re, newstring);
    return sItem;
  };
});