Variable: isearch-mode-hook
isearch-mode-hook is a variable defined in isearch.el.gz.
Value
(multi-isearch-setup)
Documentation
Function(s) to call after starting up an incremental search.
Probably introduced at or before Emacs version 19.29.
Source Code
;; Defined in /usr/src/emacs/lisp/isearch.el.gz
(defvar isearch-mode-hook nil
"Function(s) to call after starting up an incremental search.")