Disable default value in minibuffer in Emacs

Question

I'm using query-replace-regexp very often and there are very long expressions from time to time.

My problem is the following:

Query replace regexp (default foo -> bar):

Is there a possibility to hide the default expression?

Answer 1

If you use minibuffer-electric-default-mode, the default will disappear as soon as you type something into the minibuffer.

Answer 2

A simple advice does the job:

(defadvice query-replace-read-from (before no-default activate)
  (setq query-replace-defaults nil))