If a function, use that function as an `isearch-regexp-function'.
Example functions (and the keys to toggle them during isearch)
are `word-search-regexp' \(`\\[isearch-toggle-word]'), `isearch-symbol-regexp'
If a function, use that function as an `isearch-regexp-function'.
Example functions (and the keys to toggle them during isearch)
are `word-search-regexp' \(`\\[isearch-toggle-word]'), `isearch-symbol-regexp'