query-replace-from-to-separator

query-replace-from-to-separator is a variable defined in `replace.el'.
Its value is

#(" -> " 0 4 (face minibuffer-prompt))

Original value was

#(" → " 0 3
  (face minibuffer-prompt))

Documentation:
String that separates FROM and TO in the history of replacement pairs.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 25.1 of Emacs.