starting point.
Type \\[isearch-query-replace] to start `query-replace' with string to\
-replace from last search string.
+ replace from last search string.
Type \\[isearch-query-replace-regexp] to start `query-replace-regexp'\
-with string to replace from last search string..
+ with string to replace from last search string..
Type \\[isearch-toggle-case-fold] to toggle search case-sensitivity.
Type \\[isearch-toggle-regexp] to toggle regular-expression mode.