`isearch-word' went well beyond its original purpose, and the name no longer makes sense. It is now called `isearch-regexp-function', and it's value should always be a function that converts a string to a regexp (though setting it to t is still supported for now). (isearch-word): Make obsolete. (isearch-regexp-function): New variable. (isearch-mode, isearch-done, isearch--state, isearch--set-state) (with-isearch-suspended, isearch-toggle-regexp) (isearch-toggle-word, isearch-toggle-symbol) (isearch-toggle-character-fold, isearch-query-replace) (isearch-occur, isearch-highlight-regexp) (isearch-search-and-update, isearch-message-prefix) (isearch-search-fun-default, isearch-search) (isearch-lazy-highlight-new-loop, isearch-lazy-highlight-search): Use it. (isearch-lazy-highlight-regexp-function): New var. (isearch-lazy-highlight-word): Make obsolete. (isearch--describe-regexp-mode): New function. (isearch--describe-word-mode): Make obsolete. * lisp/info.el (Info-isearch-search): Use the new var. * lisp/replace.el (replace-search, replace-highlight): Use the new var. * lisp/obsolete/longlines.el (longlines-search-function): Use the new var. * lisp/hexl.el (hexl-isearch-search-function): Use the new var. * lisp/cedet/semantic/senator.el (senator-isearch-search-fun): Use the new var.